The Burden Cancer-Related Deaths Attributable to High Body Mass Index in a Gulf Cooperation Council: Results from the Global Burden of Disease Study 2019.

BACKGROUND: BMI has been reported to be a major risk factor for the increased burden of several diseases. This study explores the burden of cancer linked to high body mass index (BMI) in Gulf Cooperation Council (GCC) countries and assesses the correlation with Socio-demographic Index (SDI). METHOD: Using Global burden of disease (GBD) 2019 data, the authors quantified cancer burden through mortality, DALYs, age standardized mortality rate (ASMR), and age standardized DALYs rate (ASDR) across sexes, countries, cancer types, and years. Spearman's correlation tested ASMR against SDI. The authors estimated 95% uncertainty limits (UIs) for population attribution fraction (PAFs). RESULTS: Between 1990 and 2019, all six GCC countries showed increased number of the overall cancer-related deaths (398.73% in Bahrain to 1404.25% in United Arab Emirates), and DALYs (347.38% in Kuwait, to 1479.35% in United Arab Emirates) reflecting significant increasing in deaths, and burden cancer attributed to high BMI. In 2019, across GCC countries, pancreatic, uterine, and kidney cancer accounted for 87.91% of the total attributable deaths associated with high BMI in females, whereas in male, colon and rectum cancer alone accounted for 26% of all attributable deaths associated with high BMI. CONCLUSION: The study highlights the significant impact of high BMI on cancer burden in GCC countries. Moreover, the study identifies specific cancers, such as pancreatic, uterine, and kidney cancer in females, and colon and rectum cancer in males, as major contributors to attributable deaths, urging targeted prevention strategies at reducing weight and encouraging physical activity could greatly lessen the impact of diseases in the GCC countries.

Perception of the Accreditation of the National Commission for Academic Accreditation and Assessment at Different Health Colleges in Jeddah, Saudi Arabia.

Introduction Following the guidelines for maintaining quality set forth by the National Commission for Academic Accreditation and Assessment (NCAAA) accreditation procedure, Saudi higher education institutions, including health sciences colleges, must adhere to these guidelines. This study aims to assess the perception of personnel involved in NCAAA accreditation processes about the purpose, process, motivation, and level of involvement in the NCAAA accreditation at King Saud bin Abdulaziz University for Health Sciences (KSAU-HS). Methods The study was conducted at KSAU-HS, Jeddah. The participants included 15 administrators and 32 faculties from the College of Medicine, College of Applied Medical Sciences, and College of Nursing with experience in the NCAAA process. A questionnaire was used to determine how motivated and involved people feel about the accreditation process. Data were examined statistically with SPSS (Version 23; IBM Corp., Armonk, NY, USA), and descriptive statistics were used. Results Forty-seven participants (23 men, 24 women, ages 36 to 55) took part in the study, of which 68% were faculty members and 32% were administrators with a variety of skill sets from the three colleges. Most participants displayed a positive attitude toward the NCAAA accreditation's motive and level of commitment. Conclusions Most of the participants in the current study contended with the NCAAA process and deemed it substantial long-term improvements.

The experience of Saudi respiratory therapists dealing with COVID-19 patients: A qualitative study.

BACKGROUND: Healthcare professionals have fought hard to restrain the COVID-19 pandemic by providing high-quality care for their infected patients, but in doing so they have developed fears of becoming sick and feelings of isolation and loneliness. The lived experience of respiratory therapists (RTs) in Saudi Arabia who works with these infected patients needs further investigation. The study sought to describe the experiences and coping strategies of Saudi RT managing patients with COVID-19. MATERIALS AND METHODS: The study utilized qualitative research methods, specifically employing a phenomenological research design. A total of 25 Saudi RT (RTs) who were in direct contact with COVID-19 patients were selected after they agreed to participate in this study. The study followed a one-on-one semi-structured interview process using the Zoom platform. This qualitative data collection technique focuses on the participants' lived experiences and feelings to discover shared patterns. The data were analyzed via an inductive approach. RESULTS: Six themes were found in the RT perceptions including stress while treating COVID patients, managing the fear of catching of Covid 19, feelings towards COVID-19 patients, challenges faced by female RTs, workplace experiences, and excessive workload. CONCLUSIONS: RTs feelings dramatically changed throughout the COVID-19 pandemic. All the RTs have developed a self-copying style that has helped them improve their psychosocial behavior to face the pandemic. During the outbreak, frontline RTs' positive and negative emotions intertwined and coexisted. Negative emotions predominated in the beginning, while good feelings emerged gradually. Self-coping methods and psychosocial development were significant factors in RTs mental health while caring for COVID-19 patients.

Establishment of reference intervals for hematological parameters of adult population in the western region of Saudi Arabia.

BACKGROUND: Most of hematology laboratories in Saudi Arabia utilize the reference intervals (RIs) provided by instrument manufacturers. This study aimed to define RIs of hematological parameters for adult population in the western region of Saudi Arabia and to explore their specific features from an international perspective. METHOD: This study was conducted according to the harmonized protocol of IFCC Committee on RIs and Decision Limits. Blood samples collected from 409 healthy Saudi males and females adults were analyzed for complete blood count (CBC) by using Cell-Dyn Sapphire analyzer and for iron profile by using Architect analyzers. The needs for RIs partitioned by sex and age was based on standard deviation ratio (SDR) and/or bias ratio (BR). RIs were derived parametrically with/without application of the latent abnormal values exclusion method (LAVE). RESULTS: Based on thresholds of SDR≥0.4 and/or BR≥0.57, RIs were partitioned by sex for red-blood cell count, hemoglobin, hematocrit, red cell distribution width, erythrocyte sedimentation rate, iron, transferrin, ferritin, eosinophil, platelet, plateletcrit, etc. Partitioning by age was not necessary for any of the analytes. LAVE procedure caused appreciable changes in RI limits for most erythrocyte and iron parameters but not for leukocyte parameters. Comparable to other non-IFCC studies on CBC RIs, the RBC and hematocrit (Ht) ranges have shifted to a higher side in both genders. After applying the LAVE method, the male and female RIs for Hb were 4.56 to 6.22 ×106/µL and 3.94 to 5.25 ×106/µL respectively while RIs for Ht were 40.2 to 52.0% and 33.6 to 44.5% respectively. CONCLUSION: LAVE method contributed to reducing the influence of latent anemia in deriving RIs for erythrocyte related parameters. Using the up-to-date methods, the RIs of CBC determined specifically for Saudis will help to improve the interpretation of test results in medical decision making.

COMPARISON OF BONE MATURATION RESPONSE TO TREATMENT WITH SHORT AND LONG-TERM GROWTH HORMONE THERAPY IN SHORT-STATURE PEDIATRIC PATIENTS.

Growth hormone deficiency is one of the major causes of short stature in children. It has been noted that hormonal treatment can be vindicated in short-stature children unless there are contraindications. This study aimed to investigate the impact of rhGH therapy duration on the increase of subjects' height at the end of therapy. Materials and methods: A retrospective longitudinal study of children diagnosed with short stature was followed. Participants aged between 5 and 15 years old who had their GH stimulation test done were included in the study. Collected data were patients' age, gender, rhGH therapy duration and height (cm) at presentation and the end of therapy. GH stimulation test readings and bone age were also gathered. Results: 129 children aged between 5-15 years of both gender were included in the study. They were grouped into three groups according to the duration of the received GH therapy: an 8-month group (n=25), a 14-month group (n=59) and 22-month group (n=45). No significant difference between males and females in regards to bone age, but the readings significantly increased with the increase in therapy duration (p<0.05). Growth hormone assay results were conversely reduced with the increase in GH therapy duration, with no significant difference between the two genders. Interestingly, an increase in the participant's height in the three treatment groups both males and females were reported. Overall, the increase in height was 7.08 cm, 12.58 cm and 20.84 cm in 8, 14 and 22-month groups (± 1.6, 3.3 and 4.3), respectively, a significant statistical difference between the three groups (p-value <0.05). This study provides evidence of the effect of long-term 22-month rhGH therapy on bone age and body height both in male and female children. Further prospective studies are required to assess the effect of the GH stimulation test on GH therapy.

Traumatic Brain Injury Cases' Mortality Predictors, Association, and Outcomes in the Emergency Department at a Tertiary Healthcare Center in Saudi Arabia.

Aim Incidence of traumatic brain injury (TBI) in Saudi Arabia has been estimated to be 116 per 1,00,000 population as incidence of TBI continues to rise in our region. We aim to study the demographics, mortality predictors, and factors influencing the outcome of TBI cases in a tertiary care center in Jeddah, Saudi Arabia. Materials and Methods We retrospectively collected data from all consecutive patients treated at the Emergency Department of King Abdulaziz Medical City including all acute TBI adult cases (>18 years) from 2016 to 2019. Logistic regression models were used to identify significant predictors of mortality. A total of 423 individuals with TBI were enrolled in the study. Nearly, half of them were in age group of 18 to 29 (40.77). Most patients were males (76.83%). Results Injuries were most commonly mild-to-moderate TBI (73.83%). Road traffic accident was the most common mechanism of injury (49.7%) followed by fall (39.5%). Most common mode of transportation was private cars (47.57%). Most patient required less than or equal to24hours of admission (61.23%). A total of 30 (7%) died in the hospital all of which were male with no death cases reported among females. Conclusion In conclusion, this study reports a mortality rate related to TBI that is among the lowest in the region. Injuries were male predominant with more balanced male to female ratio. Patients who were delivered to the hospital via private cars had an improved survival. These finding should be interpreted in the context of retrospective noncontrolled study design, and further future studies are encouraged to consolidate these findings.

The efficiency of high-flow nasal cannula for adult patients with coronavirus disease 19 in Jeddah, Saudi Arabia.

CONTEXT: Early use of a high-flow nasal cannula (HFNC) provides positive outcomes for preventing the risk of intubation. However, the efficiency and usage of HFNC in the case of coronavirus disease 2019 (COVID-19) among adult patients with multiple risk factors remain debatable and require more investigation. AIMS: The aim of this study was to determine the efficiency of HFNC in preventing the possible risk of intubation. SETTINGS AND DESIGN: This study was an observational cross-sectional study that was conducted at a selected hospital in Jeddah, Saudi Arabia, from July 2020 to August 2021. METHODS: The data were collected from patients' medical records through the hospital health information system. Adult COVID-19 patients who used HFNC were included, while those who used bilevel positive airway pressure or continuous positive airway pressure without any trials of HFNC and neonatal or pediatric patients were excluded. The exposure of HFNC setting which included variables such as percentages of the fraction of inspired oxygen and the duration of using HFNC were measured to find the relation with respiratory rate oxygenation (ROX) index as a measurement of patient outcome. STATISTICAL ANALYSIS USED: The data were analyzed by using the online calculator socscistatistics. com for prevalence statistics, and correlation tests of significance. Prevalence statistics were presented in mean, median, frequencies, and percentages. Statistical tests were used to measure correlations of key variables. P < 0.05 of ANOVA and t-tests was considered statistically significant. RESULTS: A total of 159 adult COVID-19 patients using HFNC were included, and most of these patients were male. The median age was 64 years. Most of patients were reported to have hypertension and diabetes mellitus. The majority (94.34%) of patients were successfully weaned from HFNC and shows effective intervention with a mean of 7.53 of ROX score. Appropriate implementation of HFNC might be a successful intervention for preventing the risk of intubation. CONCLUSIONS: According to the success rate of HFNC, which was considered a positive outcome, there might be a promising intervention for HFNC to prevent the risk of intubation and decrease the mortality rate.

Cycle Threshold Value as a Predictor of Severity and Intensive Care Unit Admission for Children Presenting to the Emergency Department With COVID-19: A Single-Center Experience From Saudi Arabia.

INTRODUCTION: The alarming infection rates of COVID-19 and variability in disease severity and outcome created the need for a prognostic marker to predict disease severity, prioritize services, and assist in clinical decision-making. The cycle threshold (Ct) value was hypothesized to be inversely correlated with viral load and subsequently disease severity. Therefore, it gained clinical interest and was an important topic for research. In this study, we aimed to determine the accuracy of the Ct value as a predictor of clinical severity in children presenting to the emergency department with COVID-19. Specifically, we aimed to compare the relationship between clinical severity among patients with high vs. low Ct values as well as to assess the correlation between the mean Ct value with the mean number of symptoms. METHODS: This is a single-center retrospective cohort study. Data were obtained from the electronic medical record software of King Abdulaziz Medical City in Jeddah, Saudi Arabia. The present study included randomly selected COVID-19 cases aged ≥1 months to 18 years who presented to the emergency department between March 2020 and May 2021. Collected clinical data were matched with laboratory data at the time of diagnosis to examine the association between Ct values and clinical factors. RESULTS: A total of 191 COVID-19 PCR-positive children were included with an overall mean Ct value of 11.5, a median of 10, and a highest Ct value of 25. The mean age of the patients was 95 months. More than half (51.35%) of the patients were admitted to the hospital, while 2.09% were admitted to the intensive care unit and one patient (0.52%) died. There was no significant association between Ct values and demographics or clinical characteristics of the patients. CONCLUSION: We demonstrated a lack of association between SARS-CoV-2 Ct value detected in nasopharyngeal swabs with disease severity, number of symptoms, oxygen requirement, intensive care unit admission, or length of hospital stay in the pediatric population presenting to the emergency department with COVID-19. This finding does not support the routine reporting of Ct values to aid clinicians in making clinical and patient-management decisions for COVID-19 patients or guide infection control or public health decisions. Further studies confirming our observations are needed.

Idiopathic Renal Infarction: An Important Differential Diagnosis of Unexplained Flank Pain.

Unexplained flank pain should alert physicians regarding the possibility of acute renal infarction. Despite its rare occurrence, prompt diagnosis and management of renal infarction can improve outcomes. We report a previously healthy 37-year-old male who presented to the emergency department complaining of left flank pain. Computed tomography angiogram showed a thrombus in the left renal artery. The patient responded well to treatment with anticoagulation, and the symptoms resolved. The present case conforms with other experiences of good outcomes when treatment is initiated in a timely manner. Anticoagulation led to resolution of the thrombus and restoration of perfusion. This case report should remind physicians to consider renal infarction in the differential diagnosis of an acute abdomen patient with no risk factors.

Clinical Characteristics of Newborn Infants Delivered to Pregnant Women With Laboratory-Confirmed COVID-19: A Single-Center Experience From Saudi Arabia.

Introduction In Saudi Arabia and countries around the world, clinical health practice has been transformed by the coronavirus 2019 (COVID-19) pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). During the early days of the pandemic, it was a major challenge to care for pregnant women with laboratory-confirmed COVID-19 and their newborn infants. In this article, we share our experience in the management of newborn infants delivered to mothers with laboratory-confirmed COVID-19. Methods A prospective single-center observational study was conducted at King Abdulaziz Medical City in Jeddah, National Guard Health Affairs, Saudi Arabia. Data collection started in March 2020 and was completed in October 2020. The inclusion criteria included mothers with laboratory-confirmed COVID-19 and their newborn infants. Results A total of 45 pregnant women with polymerase chain reaction (PCR)-confirmed COVID-19 were included in the study. Their mean age was 30.23±5.92 years. The mode of delivery was spontaneous vaginal delivery in 27 women (60%), cesarean section in 15 women (33.3%), and assisted vaginal delivery in three women (6.7%). Three mothers (6.7%) required intensive care unit admission. A total of 45 babies were born and 25 were females (55.6%), 20 males (44.4%). None of the babies had specific symptoms related to COVID-19. All babies were tested negative on the two COVID-19 nasopharyngeal swabs. Babies were initially admitted to the NICU and one baby required prolonged NICU stay due to extreme prematurity (23 weeks), one baby died due to hypoxic-ischemic encephalopathy and respiratory distress syndrome, and the remaining babies were discharged home in a stable condition. Conclusion Our experience suggests that maternal outcomes are generally favorable and no difference between vaginal and cesarean delivery in the risk of virus transmission. With strict implementation of infection prevention measures, mother-to-infant transmission is very unlikely. Early bathing of the newborn infant is preferred to reduce the risk of transmission of infection to newborn infants and the hospital staff. Breastfeeding is safe if performed under strict infection prevention measures.

Inadvertent Arterial Cannulation and Norepinephrine Infusion Due to a Misplaced Central Venous Catheter.

Central venous catheter (CVC) insertion is one of the most common procedures done for critically ill patients. The subclavian vein is the particular preferred site. Misplacement of a CVC via the subclavian vein is frequent and can result in life-threatening complications. We aim to report a rare complication of misplaced CVC in the left subclavian vein and norepinephrine infusion that was associated with right upper limb ischemia. Immediate recognition and intervention are key to prevent further complications. The use of ultrasound has proven to reduce such complication, and the hospital implemented the use of ultrasound prior to any CVC placement.

Photodynamic opening of the blood-brain barrier and pathways of brain clearing.

A new application of the photodynamic treatment (PDT) is presented for the opening of blood-brain barrier (BBB) and the brain clearing activation that is associated with it, including the use of gold nanoparticles as emerging photosensitizer carriers in PDT. The obtained results clearly demonstrate 2 pathways for the brain clearing: (1) using PDT-opening of BBB and intravenous injection of FITC-dextran we showed a clearance of this tracer via the meningeal lymphatic system in the subdural space; (2) using optical coherence tomography and intraparenchymal injection of gold nanorods, we observed their clearance through the exit gate of cerebral spinal fluid from the brain into the deep cervical lymph node, where the gold nanorods were accumulated. These data contribute to a better understanding of the cerebrovascular effects of PDT and shed light on mechanisms, underlying brain clearing after PDT-related opening of BBB, including clearance from nanoparticles as drug carriers.

Evaluation of Hospitals' Disaster Preparedness Plans in the Holy City of Makkah (Mecca): A Cross-Sectional Observation Study.

BACKGROUND: Makkah (Mecca) is a holy city located in the western region of the Kingdom of Saudi Arabia. Each year, millions of pilgrims visit Makkah. These numbers impact both routine health care delivery and disaster response. This study aimed to evaluate hospitals' disaster plans in the city of Makkah. METHODS: Study investigators administered a questionnaire survey to 17 hospitals in the city of Makkah. Data on hospital characteristics and three key domains of disaster plans (general evaluation of disaster planning, structural feasibility of the hospitals, and health care worker knowledge and training) were collated and analyzed. RESULTS: A response rate of 82% (n=14) was attained. Ten (71%) of the hospitals were government hospitals, whereas four were private hospitals. Eleven (79%) hospitals had a capacity of less than 300 beds. Only nine (64%) hospitals reviewed their disaster plan within the preceding two years. Nine (64%) respondents were drilling for disasters at least twice per year. The majority of hospitals did not rely on a hazard vulnerability analysis (HVA) to develop their Emergency Operations Plan. Eleven (79%) hospitals had the Hospital Incident Command Systems (HICS) present in their plans. All hospitals described availability of some supplies required for the first 24 hours of a disaster response, such as: N95 masks, antidotes for nerve agents, and antiviral medications. Only five (36%) hospitals had a designated decontamination area. Nine (64%) hospitals reported ability to re-designate inpatient wards into an intensive care unit (ICU) format. Only seven (50%) respondents had a protocol for increasing availability of isolation rooms to prevent the spread of airborne infection. Ten (71%) hospitals had a designated disaster-training program for health care workers. CONCLUSIONS: Makkah has experienced multiple disaster incidents over the last decade. The present research suggests that Makkah hospitals are insufficiently prepared for potential future disasters. This may represent a considerable threat to the health of both residents and visitors to Makkah. This study demonstrated that there is significant room for improvement in most aspects of hospital Emergency Operations Plans, in particular: reviewing the plan and increasing the frequency of multi-agency and multi-hospital drills. Preparedness for terrorism utilizing chemical, biologic, radiation, nuclear, explosion (CBRNE) and infectious diseases was found to be sub-optimal and should be assessed further. Al-Shareef AS , Alsulimani LK , Bojan HM , Masri TM , Grimes JO , Molloy MS , Ciottone GR . Evaluation of hospitals' disaster preparedness plans in the holy city of Makkah (Mecca): a cross-sectional observation study. Prehosp Disaster Med. 2017;32 (1):33-45.

Persistence of estrogenic activity in soils following land application of biosolids.

Estrogenic compounds may enter the environment when biosolids are applied to land. In the present study, soil samples were collected over 4 mo from a field trial following addition of biosolids. The recombinant yeast estrogen screen bioassay identified estrogenic activity in the soil at all sampling times to concentrations up to 2.3 µg 17ß-estradiol equivalency/kg. The present results indicate the potential for estrogenic compounds to persist in soil following biosolids application.

Behaviour of fullerenes (C60) in the terrestrial environment: potential release from biosolids-amended soils.

Owing of their wide-range of commercial applications, fullerene (C60) nanoparticles, are likely to reach environments through the application of treated sludge (biosolids) from wastewater treatment plants to soils. We examined the release behaviour of C60 from contaminated biosolids added to soils with varying physicochemical characteristics. Incubation studies were carried out in the dark for up to 24 weeks, by adding biosolids spiked (1.5mg/kg) with three forms of C60 (suspended in water, in humic acid, and precipitated/particulate) to six contrasting soils. Leaching of different biosolids+soil systems showed that only small fractions of C60 (<5% of applied amount) were released, depending on incubation time and soil properties (particularly dissolved organic carbon content). Release of C60 from unamended soils was greater (at least twice as much) than from biosolids-amended soils. The form of C60 used to spike the biosolids had no significant effect on the release of C60 from the different systems. Contact time of C60 in these systems only slightly increased the apparent release up to 8 weeks, followed by a decrease to 24 weeks. Mass balance analysis at the completion of the experiment revealed that 20-60% of the initial C60 applied could not be accounted for in these systems; the reasons for this are discussed.

Bioconcentration of triclosan and methyl-triclosan in marine mussels (Mytilus galloprovincialis) under laboratory conditions and in metropolitan waters of Gulf St Vincent, South Australia.

The anti-microbial agent triclosan (TCS), and its derivative methyl-triclosan (Me-TCS), are discharged with treated effluents from wastewater treatment plants to receiving environments. We investigated the bioconcentration of TCS and Me-TCS in mussels (Mytilus galloprovincialis) exposed to TCS (100 ng L(-1)) for 30 days in seawater aquaria (19±2°C) with fresh phytoplankton as a food source. Bioconcentration increased with time reaching a steady-state around 24-30 days. The bioconcentration factor (log BCF) for TCS were 2.81 L kg(-1) (dry weight) and 4.13 L kg(-1), when lipid normalised concentrations were used. Mussels were also deployed in cages at four marine locations receiving effluents from WWTPs. The mean (±SD) TCS and Me-TCS concentrations for mussels from these sites were 9.87 (±1.34) and 6.99 (±2.44) µg kg(-1). The study showed that mussels can be a useful tool for monitoring pollution of TCS and Me-TCS in marine and estuarine environments.

Biodegradation of three selected benzotriazoles in aquifer materials under aerobic and anaerobic conditions.

We investigated the biodegradation of three selected benzotriazoles (BTs), namely benzotriazole (BT), 5-methyl-benzotriazole (5-TTri) and 5-chloro-benzotriazole (CBT), in aquifer materials. Biodegradation experiments were conducted in microcosms with fresh groundwater and aquifer sediment materials under aerobic and anaerobic (nitrate, sulfate, and Fe (III) reducing) conditions. All three BTs were degraded by microorganisms in aquifer materials under aerobic and anaerobic conditions. Under aerobic conditions, BT and 5-TTri were found to be degraded fastest with their half-lives of 43 days and 31 days, respectively, among the redox conditions used. Under anaerobic conditions, CBT was found to be degraded better with its half-life of 21 days under nitrate reducing conditions than under aerobic conditions with its half-life of 47 days. The two BT derivatives 5-TTri and CBT could be biotransformed into BT via demethylation and dechlorination reactions, respectively.

Comparison of degradation between indigenous and spiked bisphenol A and triclosan in a biosolids amended soil.

This study compared the degradation of indigenous bisphenol A (BPA) and triclosan (TCS) in a biosolids-amended soil, to the degradation of spiked labelled surrogates of the same compounds (BPA-d16 and TCS-(13)C12). The aim was to determine if spiking experiments accurately predict the degradation of compounds in biosolids-amended soils using two different types of biosolids, a centrifuge dried biosolids (CDB) and a lagoon dried biosolids (LDB). The rate of degradation of the compounds was examined and the results indicated that there were considerable differences between the indigenous and spiked compounds. These differences were more marked for BPA, for which the indigenous compound was detectable throughout the study, whereas the spiked compound decreased to below the detection limit prior to the study completion. The rate of degradation for the indigenous BPA was approximately 5-times slower than that of the spiked BPA-d16. The indigenous and spiked TCS were both detectable throughout the study, however, the shape of the degradation curves varied considerably, particularly in the CDB treatment. These findings show that spiking experiments may not be suitable to predict the degradation and persistence of organic compounds following land application of biosolids.

Occurrence and removal of benzotriazoles and ultraviolet filters in a municipal wastewater treatment plant.

We investigated the occurrence and removal of four benzotriazoles (BTs) (benzotriazole: BT; 5-methyl-benzotriazole: 5-TTri; 5-chloro-benzotriazole: CBT; 5,6-dimethyl-benzotriazole: XTri) and six UV filters (benzophenone-3: BP-3; 3-(4-methylbenzylidene)camphor: 4-MBC; octyl 4-methoxycinnamate: OMC; 2-(3-t-butyl-2-hydroxy-5-methylphenyl)-5-chloro benzotriazole: UV-326; 2-(2'-Hydroxy-5'-octylphenyl)-benzotriazole: UV-329; octocrylene: OC) in a full scale municipal wastewater treatment in South Australia. BT, 5-TTri and BP-3 were found as the dominant compounds detected in the wastewater samples with average concentrations up to 5706 ± 928 ng/L, 6758 ± 1438 ng/L and 2086 ± 1027 ng/L in influent, and up to 2439 ± 233 ng/L, 610 ± 237 ng/L and 153 ± 121 ng/L in effluent, respectively. In the biosolid, 4-MBC and OC were found with the highest concentrations of 962 ± 135 ng/g and 465 ± 65 ng/g, respectively. Sorption onto sludge played a dominant role in the removal for UV filters, especially for 4-MBC, UV-326 and OC, which accounted for 54%-92% of influent loads, while biological degradation played a significant role for the other compounds.