ABSTRACT
Introduction: Arsenic is known as a carcinogenic compound in drinking water . It can cause acute and chronic effects on human health. In this study, the effect of polyamidoamine dendrimer generation 3 [PAMAM G3] as adsorbents for removal of arsenic [V].From aqueous solutions was evaluated
Methods: Adsorption experiment was studied in batch system and the effect of different variables like pH, contact time, concentrations of arsenic and adsorbent dosage on adsorption was studied. Therefore, absorption kinetics and equilibrium isotherms were determined
Results: The results showed that adsorption process is affected by some parameters such as initial concentration, adsorbent and contact time
The three models of isotherm included Langmuir, Freundlich and Dubinin- Radeshkuvich were studied that Freundlich and Langmuir isotherms were more compliant with results
Conclusion: According to results, can be concluded that adsorption with dendrimer is an appropriate method with high efficiency for removal arsenic from aqueous solutions
ABSTRACT
Cadmium is a toxic metal with wide usage in industry. It exerts toxic effects on various organs, including liver. In this study, the hepato-protective effect of hydro alcoholic extract of Oliveria decumbens on AST, ALT, ALP Enzymes following toxicity induced by cadmium chloride was investigated in male rat. In this experimental study, 48 adult male Wistar rats were divided into 6 groups of 8. These groups were as follow: the control, left untreated; the sham, just received distilled water; the experimental group 1, treated with 2mg/kg cadmium chloride; the experimental group 2 received 500 mg/kg oliveria extract, and experimental groups 3 and 4 initially received 2mg/kg cadmium chloride followed by 250 and 500 mg/kg extract respectively for 21 days. At the end of experiment, blood samples were taken, and were prepared for measuring serum levels of hepatic enzymes. In comparison with control and sham groups, serum levels of ALT, AST, ALP enzymes increased significantly in the experimental group 1. There were no significant changes in the enzyme levels in the experimental group 2. There were no significant changes in the levels of ALT, AST, ALP enzymes in the experimental group 3 compared to control and sham groups. A significant decrease was observed in the levels of ALT, AST, ALP enzymes in the experimental group 4 in comparison with experimental group 1 [P<0.05]. The results showed that O.decumbens extract could possess protective effect against hepatotoxicity induced by heavy metals, such as cadmium and could improve the liver function
ABSTRACT
Introduction and Aims: Job accidents impose many economic and social problems on the society. The purpose of this study was to determine the frequency of accidents and their relation to epidemiologic factors in the production and exploitation factory of sturgeon in the port of Bandar Turkaman in 2009
Methods: This descriptive study used statistical information and accidents report forms in the factory. A two-part checklist was designed. The former part contained the injured person's profile such as age, sex, education, work experience and marital status, and the latter part contained details related to the accident itselfsuch as the causes, consequences, time and location of the accident. Data were analyzed with the software Excel
Results: The survey results showed that most accident victims [54%] were aged between 50-45 years. The most frequent accidents was happened at 10 a.m. September with a 12.6 percent and January and February, each with 11.7 percent, had the highest frequency of accidents among the months of the year. The most injured organ was the hand with the percent of 79, and as for the type of accidents, cutting [68%] had the highest frequency
Conclusion: Studies showed that many accidents occur in this factory but some job accidents are not recorded because the system for reporting and recording accidents in detail does not exist. It is recommended that all accidents be recorded in accordance with scientific methods and standards recommended by the International Labour Organization classification