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31.
32.
Klánová J Kohoutek J Hamplová L Urbanová P Holoubek I 《Environmental pollution (Barking, Essex : 1987)》2006,144(2):393-405
The potential of passive air sampling devices (polyurethane foam disks) to assess the influence of local sources on the quality of the surrounding environment was investigated. DEZA Valasske Mezirici, a coal tar and mixed tar oils processing plant, and Spolana Neratovice, a chemical factory with the history of high production of organochlorinated pesticides (OCPs), were selected as the point sources of PAHs, and OCPs, respectively. Levels of PCBs, OCPs and PAHs were determined for all sampling sites and sampling periods. The study brought useful data about the air concentrations of POPs in the investigated regions. More important, it provided information on the transport and fate of POPs in the vicinity of local sources of contamination useful for the estimation of their influence. Very good capability of passive samplers to reflect temporal and spatial fluctuation in concentrations of persistent organic pollutants in the ambient air was confirmed which makes them applicable for monitoring on the local scale. 相似文献
33.
Cupr P Klánová J Bartos T Flegrová Z Kohoutek J Holoubek I 《Environmental pollution (Barking, Essex : 1987)》2006,144(2):406-413
The capability of passive air sampling to be employed in the evaluation of direct genotoxicity of ambient air samples was assessed. Genotoxic effects of the total extracts from the polyurethane foam filters exposed for 28 days during a regional passive air sampling campaign were investigated. Twenty sampling sites were selected in Brno city on the area of approximately 20x20 km in October and November 2004. Brno is the second largest city of the Czech Republic, highly industrialized with approximately 370,000 of permanent inhabitants. The levels of PAHs, PCBs, and chlorinated pesticides were determined in all samples. Fraction of each extract was also assayed in the bacterial genotoxicity test using Escherichia coli sulA::lacZ. Complete dose-response relationships of the air extracts were determined. The statistical analysis showed significant correlation between observed biological effects and PAHs concentrations in samples. 相似文献
34.
Mutavdzić D Brnardić I Kastelan-Macan M 《Journal of environmental science and health. Part. B》2006,41(7):1085-1101
The purpose of this investigation was to determine the influence of humic acids (HA) and Ca-montmorillonite (CaM) on the solid-phase extraction (SPE) efficiency of atrazine, alachlor and alpha-cypermethrin from water samples at various pH-values. The nature and intensity of binding of the studied pesticides to CaM were determined by X-ray diffraction analysis and termogravimetric analysis (TGA) test. The studied pesticides eluted from discs were analysed by thin-layer chromatography (TLC). The effects of CaM and humic acid were generally pH-dependent and acted independently in extraction efficiency influence. Lower recovery of pesticides was observed at higher pH values when CaM was > or =0.1 g and was attributed to greater dispersion of clay, increased surface area and subsequent adsorption. Concentrations of dissolved organic carbon (DOC) in humic acid had less effect on the extraction efficiency when water was at pH 8 compared to water at pH 2, which was probably due to greater nonpolar interactions of the pesticides to the charge-neutralized humic acid molecule. 相似文献
35.
Mikov I Stankov K Vasovic V Mikov A Golocorbin-Kon S Mikov M 《International journal of occupational safety and ergonomics》2012,18(1):107-111
The toxicity of benzene is not an issue of the past, especially in developing countries. Bone marrow toxicity is demonstrated among workers. In this study, the effect of simultaneous exposure to benzene and ethanol on benzene metabolism in mice was investigated by measuring the excretion of thioethers in urine. Urinary thioether excretion significantly decreased in the mice receiving both benzene and ethanol compared with the animals receiving benzene only. The assay of determining thioethers in urine samples in this study is a simple and low-cost method, thus suitable for routine use, especially in developing countries, not only for benzene, but also for other alkilating agents, which can be found during occupational exposure. Our results suggest that further research is needed to elucidate the mechanisms of decreased urinary excretion of thioether after simultaneous exposure to benzene and ethanol. 相似文献
36.
Jelena Cvejic Sylvie Tambutté Severine Lotto Momir Mikov Ivan Slacanin Denis Allemand 《Marine Biology》2007,152(4):855-862
Corallium rubrum is the most famous and precious coral due to the intense characteristic red colour of its skeleton. We have determined the
presence of carotenoids in natural samples of C. rubrum from Marseille, Riou, and investigated their chemical composition. Analysis was performed both on soft tissues and hard tissues
including spicules and skeleton. Since hard tissues are made of a mineral fraction and an organic fraction obtained after
demineralization, extraction was performed both with and without demineralization by EDTA. The extracts were analyzed by complementary
methods of TLC, HPLC/DAD and HPLC/MS. The components were separated by RP-18 chromatography column using acetonitrile/methanol
for HPLC/DAD and acetonitrile/water gradient for HPLC/MS analysis. Our results give the first evidence of the presence of
canthaxanthin, 4,4′-diketo-β-carotene, as the major carotenoid in all samples. Spicules exhibited higher content in carotenoids
than skeleton. Demineralization treatment improved the efficiency of carotenoid extraction by an average factor of 5 and showed
that organic matrix contains canthaxanthin. 相似文献
37.
Nearly 91% of organic pollutants in Hong Kong leachate could be effectively removed by the UASB(upflow anaerobic sludge blanket)process followed by the fenton coagulation.The COD(chemical oxygen demand)of leachate was lowered from an average of 5620 mg/L to 1910 mg/L after the UASB treatment at 37℃,and was further lowered to 513 mg/L after fenton coagulation.The remaining refractory residues could be further removed by plotochemical oxidation with the addition of H2O2.The BOD/COD ratio was greatly increased from 0.062 to 0.142,indicating the biodegradability of organic residues was improved.The photochemical oxidation for the fenton-coagulation supernatant was most effective at pH3-4,with the addition of 800 mg/L of H2O2,and UV radiation time of 30 minutes.The final effluent contained only 148 mg/L of COD,21 mg/L of BOD(biochemical oxygen demand)and 56 mg/L of TOC (total organic carbon). 相似文献
38.
Wang S Beasley HL Sumpter SR Kennedy IR 《Journal of environmental science and health. Part. B》2003,38(3):281-291
An enzyme-linked immunosorbent assay (ELISA) for pyrithiobac-sodium (Staple) produced by DuPont was validated in Australian soils. This pyrithiobac-sodium ELISA was shown to be highly sensitive with the limit of detection of 4-5 ppt. Soil samples were extracted either in PBS buffer by shaking or by accelerated solvent extraction (ASE). While pyrithiobac sodium can be analyzed directly by ELISA after ASE extraction with 1/10 or more dilutions, the analysis of PBS extract required filtration and dilution 1/20 or more depending on the concentration. Immunoassay results compared favorably with GC-MS results for both ASE and PBS extract of incurred residue of pyrithiobac sodium in soil samples, indicating that this ELISA can be an inexpensive and reliable alternative to conventional residue analysis methods for quantification of pyrithiobac-sodium. This validation provided the basis for applying the ELISA to a field study of pyrithiobac-sodium. 相似文献
39.
Ivan Macuzic Eva Giagloglou Marko Djapan Petar Todorovic Branislav Jeremic 《International journal of occupational safety and ergonomics》2016,22(4):514-522
Serbia is aligning with European Union requirements and the occupational safety and health (OSH) administration is one of the most representative sectors of this alignment. Many efforts were made in this field, by introducing new laws and regulations, but it turned out to be insufficient. OSH professionals need to renovate and strengthen their knowledge in accordance with continuous, updated and improved OSH standards and regulation. Lifelong learning (LLL) programmes can contribute to forming professionals who are always up to date. This paper presents an implemented LLL programme, over the duration of two academic years, dedicated to OSH professionals, and investigates whether this programme will be helpful and accepted by professionals. The results from the study show that the given LLL programme had indeed a positive influence on the professional careers of the participants and that the LLL presents the future trend in OSH education. 相似文献
40.
Du?ica Ili? Ivan S. Risti? Ljubi?a Nikoli? Mihajlo Stankovi? Goran Nikoli? Ljiljana Stanojevi? Vesna Nikoli? 《Journal of Polymers and the Environment》2012,20(1):80-87
In this work was described poly(d,l-lactide) microwave synthesis using tin(II) 2-ethylhexanoate initiated ring-opening polymerization. Polymerization was performed
at 100 °C with monomer to initiator molar ratio ([M]/[I]) of 5,000 in 30 min. The achieved number average molar mass of obtained
polymers (determined by gel permeation chromatography) was 102,320 g/mol, with the polydispersion index, Q, 2.80. Structural characterization was performed by FT-IR spectroscopy followed characteristic bands. For applicative purposes
the obtained polymer was purified during the procedure of microsphere preparation. Biodegradable microspheres prepared from
poly(d,l-lactide) have been widely studied in recent years and have become well established controlled drug delivery systems. In this
work microspheres were loaded with allyl thiosulfinate (allicin) and its transforments products (ajoene and vinyldithiine),
as pharmacological active substances. The morphology of the microspheres was analyzed using a scanning electron microscope.
Allicin was synthesized by acid oxidation of allyl disufide and purification of obtained products by liquid–liquid extraction
with diethyl ether. Obtained allicin, purity 73%, was transformed using microwave in acetone solution, at solvent boiling
temperature, for 5 min. For the quality and quantity analysis of allicin and its transformation process was used LC/MS chromatography.
(E)- and (Z)-ajoene were detected at retention time 3.1 and 3.3 min, respectively, whence 3-vynil-4H-1,2-dithiine and 2-vynil-4H-1,3-dithiine
were detected at 4.3 and 4.8 min, respectively. Retention time of allicin was 2.93 min, according to liquid chromatography
results. HPLC method was used for assessment of pharmaceutical substances (alicine and alicine transforments) releasing from
microspheres at room temperature in solutions with different pH (pH = 3 and pH = 8) for 24 h. 相似文献