排序方式: 共有129条查询结果,搜索用时 15 毫秒
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Agata Witczak Agnieszka Patrzykąt 《Journal of environmental science and health. Part. B》2013,48(2):191-197
The aim of this study was to compare recoveries of organochlorine pesticides (heptachlor, α-HCH, β-HCH, γ-HCH, op′-DDD, pp′-DDD, pp′-DDE, op′-DDT, pp′-DDT) from fish muscle dried by two alternative methods: (i) grinding with anhydrous sodium sulphate and (ii) freeze drying. Pesticide residues content was determined by gas chromatography-mass spectrometry (GS-MS) method. For four pesticides (γ-HCH, α-HCH, heptachlor and pp;-DDD) in four of five fish species, higher recoveries were obtained from the freeze-dried samples. For five remaining pesticides, correlations between fish species and drying method were not found. The results of this study do not clearly indicate which drying method caused lower losses of analytes. Recoveries from the freeze-dried samples ranged from 69.9 to 117.6 %, while recoveries from the samples ground with sodium sulphate varied from 64.4 to 126.7 %. Either of the methods gave satisfactory recoveries and they both can be used interchangeably. 相似文献
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Piotr Konieczny Agnieszka Wolska Jacek Swiderski Andrzej Zajac 《International journal of occupational safety and ergonomics》2008,14(2):133-147
This paper presents a computer simulation of reflected and scattered laser radiation for calculating the angle of laser shields performed with the Laser Shield Solver computer program. The authors describe a method of calculating the shield angle for laser shields which protect workers against reflected and scattered laser radiation and which are made from different materials. The main assumptions of the program, which calculates and simulates reflected laser radiation from any material and which can be used for designing shield angles, are presented. Calculations are compared with measurements of reflected laser radiation. The results for one type of laser and different materials which interacted with a laser beam showed that the Laser Shield Solver was an appropriate tool for designing laser shields and its simulations of reflected laser radiation distribution have practical use. 相似文献
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Relations between metals (Zn, Pb, Cd and Cu) and glutathione-dependent detoxifying enzymes in spiders from a heavy metal pollution gradient 总被引:10,自引:0,他引:10
Wilczek G Babczyńska A Augustyniak M Migula P 《Environmental pollution (Barking, Essex : 1987)》2004,132(3):453-461
We studied the relations between glutathione-dependent detoxifying enzymes and heavy metal burdens in the web-building spider Agelena labyrinthica (Agelenidae) and the wolf spider Pardosa lugubris (Lycosidae) from five meadow sites along a heavy metal pollution gradient. We assayed the activity of glutathione-S-transferase (GST) and glutathione peroxidases (GPOX, GSTPx), and glutathione (GSH) levels in both sexes. Except for GSH vs Pb content, we found significant correlations between GPOX and GSTPx activity and metal concentrations in females of A. labyrinthica. The highest activity of these enzymes measured in the web-building spiders was found in the individuals from the most polluted sites. In P. lugubris males significant correlations were found between GST and Pb and Zn concentrations, and between GPOX and GSTPx and the concentration of Cu. GST activity was higher in males collected from less polluted areas. Thus, detoxifying strategies against pollutants seemed to be sex-dependent. Actively hunting spiders had higher metal concentrations, maintaining lower activity of detoxifying enzymes and a lower glutathione level. 相似文献
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Dybowska AD Croteau MN Misra SK Berhanu D Luoma SN Christian P O'Brien P Valsami-Jones E 《Environmental pollution (Barking, Essex : 1987)》2011,159(1):266-273
Understanding the behavior of engineered nanoparticles in the environment and within organisms is perhaps the biggest obstacle to the safe development of nanotechnologies. Reliable tracing is a particular issue for nanoparticles such as ZnO, because Zn is an essential element and a common pollutant thus present at elevated background concentrations. We synthesized isotopically enriched (89.6%) with a rare isotope of Zn (67Zn) ZnO nanoparticles and measured the uptake of 67Zn by L. stagnalis exposed to diatoms amended with the particles. Stable isotope technique is sufficiently sensitive to determine the uptake of Zn at an exposure equivalent to lower concentration range (<15 μg g−1). Without a tracer, detection of newly accumulated Zn is significant at Zn exposure concentration only above 5000 μg g−1 which represents some of the most contaminated Zn conditions. Only by using a tracer we can study Zn uptake at a range of environmentally realistic exposure conditions. 相似文献
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Huszcza E Bartmańska A Anioł M Maczka W Zołnierczyk A Wawrzeńczyk C 《Waste management (New York, N.Y.)》2008,28(8):1406-1410
Nine fungal strains related to: Trametes versicolor, Nigrospora oryzae, Inonotus radiatus, Crumenulopsis sororia, Coryneum betulinum, Cryptosporiopsis radicicola, Fusarium equiseti, Rhodotorula glutinis and Candida parapsilosis were tested for their ability to degrade humulones and lupulones. The best results were obtained for T. versicolor culture, in which humulones and lupulones were fully degraded after 4days of incubation in the dark or after 36h in the light. The experiments were performed on a commercial hop extract and on sterilized spent hops. 相似文献
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Assessing the bioavailability of phenanthrene to soil microorganisms using the Tenax extraction method 总被引:1,自引:0,他引:1
Smreczak B Maliszewska-Kordybach B Klimkowicz-Pawlas A 《Environmental geochemistry and health》2008,30(2):183-186
The Tenax TA extraction technique followed by gas chromatography mass spectrometry (GC-MS) determinations was used to assess
the actually bioavailable fraction of phenanthrene (ABF-Phe) in three different soils freshly contaminated with this compound
at levels of 10, 100, and 1,000 mg kg−1. The results were related to the ecotoxic effect of phenanthrene on soil nitrifying bacteria. Nitrification potential measurements
were applied as an ecotoxicity end point. A strong positive linear relationship (r
2 = 0.95) was obtained between the content of the actually bioavailable phenanthrene fraction and the inhibition of nitrifying
bacteria activity. 相似文献
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Gebler Daniel Kolada Agnieszka Pasztaleniec Agnieszka Szoszkiewicz Krzysztof 《Environmental science and pollution research international》2021,28(5):5383-5397
Environmental Science and Pollution Research - Since 2000, after the Water Framework Directive came into force, aquatic ecosystems’ bioassessment has acquired immense practical importance for... 相似文献