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461.
Chu S Henny CJ Kaiser JL Drouillard KG Haffner GD Letcher RJ 《Environmental pollution (Barking, Essex : 1987)》2007,145(1):374-381
Current-use chlorophenoxy herbicides including 2,4-dichlorophenoxyacetic acid, dicamba, triclopyr, dicamba, dimethyl tetrachloroterephthalate (DCPA or dacthal), and the metabolite of pyrethroids, 3-phenoxybenzoic acid (3-PBA), and the fungicide, chlorothalonil, were investigated in the eggs of osprey (Pandion haliaetus) that were collected from 15 sites from five study areas Puget Sound/Seattle area of Washington State, USA. DCPA differs from acidic chlorophenoxy herbicides, and is not readily hydrolyzed to free acid or acid metabolites, and thus we developed a new method. Of the 12 chlorophenoxy herbicides and chlorothalonil analyzed only DCPA could be quantified at six of these sites (2.0 to 10.3 pg/g fresh weight). However, higher levels (6.9 to 85.5 pg/g fresh weight) of the unexpected DCPA structural isomer, dimethyl tetrachlorophthalate (diMe-TCP) were quantified in eggs from all sites. diMe-TCP concentrations tended to be higher in eggs from the Everett Harbor area. As diMe-TCP is not an industrial product, and not commercially available, the source of diMe-TCP is unclear. Regardless, these findings indicate that DCPA and diMe-TCP can be accumulated in the food chain of fish-eating osprey, and transferred in ovo to eggs, and thus may be of concern to the health of the developing chick and the general reproductive health of this osprey population. 相似文献
462.
Dissipation of carbofuran and carbaryl on Oolong tea during tea bushes, manufacturing and roasting processes 总被引:1,自引:0,他引:1
Carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranol-N-methylcarbamate) and carbaryl (1-naphthyl-N-methylcarbamate) are insecticides widely used in tea plantations. The objective of the present study was to evaluate the dissipation of carbofuran and carbaryl during the growth periods of Oolong tea, processing and roasting. Analysis of the residual insecticides was carried out using high-pressure liquid chromatography with a post-column fluorescence detector. Results showed that in the tea field carbofuran dissipated faster then carbaryl. Manufacturing processes of Oolong tea further reduced the carbofuran and carbaryl contents. The persistence of carbofuran and carbaryl was decreased with increasing roasting temperature. From the results, we conclude that the presence of carbofuran and carbaryl in tea can be reduced by proper field management, manufacturing and roasting processes. 相似文献
463.
通过室内培养和盆栽试验 ,研究了镧积累对红壤有效养分的影响。结果表明 ,镧积累降低了土壤有效氮、有效磷含量 ,有效氮、有效磷含量与镧浓度呈显著的负相关 ,镧对土壤有效钾的影响不明显。 相似文献
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The influence of the nonionic surfactant Tween 80 on pentachlorophenol (PCP) oxidation catalyzed by horseradish peroxidase was studied. The surfactant was tested at concentrations below and above its critical micelle concentration (CMC). Enhancement of PCP removal was observed at sub-CMCs. The presence of Tween 80 in the reaction mixture reduced enzyme inactivation which occurred through a combination of free radical attack and sorption by precipitated products. A simple first-order model was able to simulate time profiles for enzyme inactivation in the presence or absence of Tween 80. At supra-CMCs, the surfactant caused noticeable reductions in PCP removal, presumably through micelle partitioning of PCP which precluded the hydrophobic PCP molecule from interacting with the enzyme. 相似文献
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The ADMI (American Dye Manufactures’ Institute) 3 and 31 wavelength (WL) methods are the most popular measurements of the
wastewater true color. However, significantly different measured results were found between the ADMI 3 and 31 WL methods for
the same sample. This finding indicates that the ADMI 3 and 31 WL values should not be directly substituted for each other,
resulting in the incomparability of these two color values. An innovative calculation using the Back-Propagation Neural Network
(BPN) was therefore proposed to replace the original calculation method proposed in Standard Method. The BPN-calculated ADMI
3 WL values were found to be very close to the corresponding measured ADMI 31 WL values. Additionally, for more accurate measurement
of the true color, new measurement methods containing 4 and 6 wavelengths were proposed and cooperated with the BPN calculation
model. The new approaches performed very accuracy measured results of the wastewater true color. Finally, the trained BPN
calculation models were built to be applied to measure the true color of real textile samples and also performed very good
measured results. 相似文献
470.
Chu Xu Chu Zhujie Huang Wei-Chiao He Youquan Chen Mengqing Abula Maierheba 《Journal of Material Cycles and Waste Management》2023,25(3):1333-1343
Journal of Material Cycles and Waste Management - Waste treatment is a problem faced by cities all over the world. In recent years, China, as a developing country, regards the municipal solid waste... 相似文献