RESUMO
Detailed information on in-harbour shipping contribution to size segregated particles in coastal cities are scarce, especially in the busy Mediterranean basin. This poses issues for human exposure and air quality in urban harbour agglomerates, where only criteria pollutants (i.e. PM10 and/or PM2.5) are usually monitored. In this work, particle number and mass size distributions, in a large size range (0.01-31 µm), were obtained in two coastal cities of northern Adriatic Sea: Venice (Italy) and Rijeka (Croatia). Three size ranges were investigated: nanoparticles (diameter D < 0.25 µm); fine particles (0.25
Assuntos
Poluentes Atmosféricos/análise , Navios , Cidades , Croácia , Monitoramento Ambiental , Humanos , Itália , Tamanho da Partícula , Material Particulado/análiseRESUMO
The determination of ambient levels of nitrogen dioxide (NO2) and ammonia (NH3) in the Rijeka Bay area started in 1980, as a part of the air quality monitoring programme. The results of 15 years of surveying (1980/81-1994/95) on ambient levels of these pollutants at two sampling sites are given in this work. Site 1 is located in the city, opposite the old petroleum refinery facilities, while Site 2 is located in the settlement 25 km from the city, opposite the eastern industrial zone. Annual means of NO2 varied between 34 and 60 g/m3 at Site 1 and between 14 and 26 g/m3 at Site 2, but do not follow the 40% reduction in industrial emissions of this pollutant, probably due to the dominant impact of other minor sources, like traffic. Yearly averages of NH3 were in the range of 13 to 26 g/m 3 at Site 1 and 7 to 16 g/m3 at Site 2, and are practically constant during the period studied.
Assuntos
Poluentes Atmosféricos/análise , Amônia/análise , Monitoramento Ambiental/estatística & dados numéricos , Dióxido de Nitrogênio/análise , Croácia , Monitoramento Ambiental/métodos , Geografia , Indústrias , Estações do Ano , Dióxido de Enxofre/análiseRESUMO
Protection against corrosion in the shipyard is a source of airborne particles. From October 1996 to September 1997 samples of suspended particles (1 site) and dustfall (6 sites) were collected in the vicinity of a repairs shipyard situated in the martinscica Cove, east of the city of Rijeka, Croatia. Collected samples were analysed for lead, cadmium, iron, copper, and zinc content. Though annual mean concentrations of suspended particles, lead, and cadmium kept below the guideline values, the metal contents were generally higher than values measured in the city centre. The correlation between the quantity of abrasives used at the shipyard and monthly mean concentrations of all parameters except cadmium suggests that the shipyard was the main source of those pollutants. The annual mean, as well as maximum monthly amount of dustfall at the site next to the shipyard zone exceeded the national limit values, indicating considerable pollution of this area with coarse particles. The annual mean quantity of lead in dustfall exceeded the guideline values at the same site. The content of metals occasionally observed in dustfall at particular sites surrounding the shipyard depended on the location of corrosion protection activities and meterological conditions within the Martinscica Cove.
Assuntos
Poluentes Ocupacionais do Ar/análise , Metais/análise , Croácia , Indústrias , NaviosRESUMO
Earlier results on ozone destruction on solid surfaces gave apparent first order kinetics. Estimating the reaction kinetics from our data on ozone destruction on various powders (silica-gel, alumina, wood ash, coal ash, Saharan sand, calcite), we found that only calcite and wood ash exhibited such a behaviour. Removal of ozone by other powders used showed two straight lines in ln c-t plot with two different half-lives, t'(1/2) < t''(1/2). Comparing the kinetic constants for ozone removal on silica-gel and that of ozone reactions with polynuclear aromatic hydrocarbons (PAHs) adsorbed in submonolayer coverage on the same powder, the first reaction seems to be more likely in the case of pyrene and particularly fluoranthene. Enhanced ozone destruction on airborne aerosols could be an additional reason for fluoranthene stability in the real atmosphere.
Assuntos
Ozônio/química , Hidrocarbonetos Policíclicos Aromáticos/química , Reatores Biológicos , Géis , Cinética , Pós/química , Propriedades de SuperfícieRESUMO
During the eighties the city of Rijeka was one of the most polluted cities in Croatia with sulphur dioxide due to high emission of this pollutant from industrial plants. In mid-eighties, annual means of SO2 exceeded 100 micrograms/m3 in the city centre, in the Bakar Bay area varied between 70-80 micrograms/m3, while in the suburban residential area they were up to 40 micrograms/m3. In 1995 annual means were below the guideline value of 50 micrograms/m3 in the whole Rijeka Bay area. Emission inventory based on 1989 data estimated total SO2 emission to approximately 36,000 t a year, 95% of which from industrial sources. The update from 1995 data gave a new estimate of approximately 11,000 t a year, which is a 70.5% reduction of SO2 emission. However, the contribution of emissions from industrial sources remained practically unchanged (95%). The emission reduction resulted in the decrease of ambient levels of SO2. The paper presents trends in SO2 annual mean concentrations in the period 1986-1995 for two urban sites, two sites situated in the industrial area east of the city, and a suburban residential site.
Assuntos
Poluentes Atmosféricos/análise , Dióxido de Enxofre/análise , CroáciaRESUMO
This study compares the chemical composition of rainwater samples collected at two sampling sites, the first situated in the Rijeka city centre and the second in a suburban site 120 m above the sea level. The rainwater samples were analysed for precipitation weighted average concentrations of hydrogen, sulphate, nitrate, chloride, ammonium, sodium, potassium, calcium, and magnesium. The results suggest that the local washout of the atmosphere enhanced the rainwater acidity in the city centre which also received significant marine contributions of sulphate, calcium, magnesium, and potassium content. Rainwater in the suburban site was affected by soil dust and/or fertilizers used in the nearby gardens, resulting in partial neutralization with rising of pH value. While the content of S-SO4 was practically equal at both sites, the quantities of N-NO3 and N-NH4 nearly doubled at the suburban site.
Assuntos
Chuva , Poluentes Químicos da Água/análise , Croácia , HumanosAssuntos
Sangue Fetal/química , Retardo do Crescimento Fetal/sangue , Recém-Nascido Prematuro/sangue , Gravidez/sangue , Zinco/sangue , Adulto , Antropometria , Ensaios Clínicos Controlados como Assunto , Feminino , Humanos , Recém-Nascido , Paridade , Valores de Referência , Sensibilidade e EspecificidadeAssuntos
Cádmio/análise , Chumbo/análise , Leite Humano/química , Adulto , Fatores Etários , Croácia , Feminino , Humanos , Fumar/metabolismoRESUMO
Zinc levels were determined in human milk and umbilical cord blood samples collected in the Rijeka Clinical Hospital during the period from September 1995 to January 1996. The average concentrations of zinc were 4.98 +/- 2.53 mg/l in breast milk (range: 1.69-11.60 mg/l) and 1.18 +/- 0.21 mg/l in umbilical cord blood (range: 0.87-1.91 mg/l). Results of group comparisons regarding mothers' age, parity, residence and smoking habits indicate that parity affected Zn levels in both, breast milk and umbilical cord blood, with higher content found in primiparae. Younger mothers (aged < or = 25 years) also had higher levels of Zn in breast milk compared to those whose age was > 25 years. Residence and smoking habits did not seem to have any impact on Zn concentrations in biological tissues studied. A weak association between umbilical cord blood Zn levels and anthropometric measurements of newborns, like birthweight and head circumference, is also observed.
Assuntos
Sangue Fetal/química , Leite Humano/química , Cordão Umbilical , Zinco/análise , Adolescente , Adulto , Análise de Variância , Peso ao Nascer , Feminino , Humanos , Recém-Nascido , Pessoa de Meia-Idade , Gravidez , Estatísticas não ParamétricasRESUMO
Ozone is a naturally occurring gas, formed in the trimolecular reaction of oxygen atoms with molecular oxygen. Its strong absorption in the UV region provides protection from excessive irradiation of the Earth's surface. Occupational exposure to ozone involves electric arc welding, mercury vapour lamps, office photocopy machines, X-ray generators and other high voltage electrical equipment, water purification and bleaching. Ozone is the most abundant oxidant in the photochemical smog. The lung cell injury induced by ozone involves a complex biochemical mechanism which is due to free radical generation. Moderate exposure produces upper respiratory tract symptoms and eye irritation, severe acute exposure results in pulmonary oedema. Measurements of atmospheric ozone concentrations in Croatia began at the end of the 19th century; continuous monitoring has been carried out since 1975.
Assuntos
Poluentes Ocupacionais do Ar , Ozônio , Poluentes Ocupacionais do Ar/efeitos adversos , Poluentes Ocupacionais do Ar/análise , Humanos , Ozônio/efeitos adversos , Ozônio/análise , Doenças Respiratórias/induzido quimicamenteRESUMO
Toxicological properties of polynuclear aromatic hydrocarbons (PAH) and their derivatives concerning their carcinogenicity, embryotoxicity and phototoxicity are reviewed. The importance of the Ames test and biologically directed chemical analysis for identification of these mutagenic compounds is emphasized. Possible chemical reactions acting as sources of mutagenic PAH derivatives in the atmosphere are given.