کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9451286 | 1307804 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Uptake and enantioselective elimination of chlordane compounds by common carp (Cyprinus carpio, L.)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Uptake and enantioselective elimination of chlordane compounds by common carp (Cyprinus carpio, L.) Uptake and enantioselective elimination of chlordane compounds by common carp (Cyprinus carpio, L.)](/preview/png/9451286.png)
چکیده انگلیسی
An analytical method involving supercritical fluid extraction (SFE) followed by a two-dimensional gas chromatography (2D-GC) analysis was developed to determine the concentration (first GC) and enantiomeric ratio (second GC) of cis- and trans-chlordanes at the ppb (ng/g) level in fish tissue. The SFE method allowed concentration of the compounds of interest, and reduced the number of extraction and sample clean-up manipulations as compared to classical solvent extraction techniques. Four hundred common carp fingerling (Cyprinus carpio, L.) were exposed for three days to water containing 5 ppb (5 ng/g) technical grade chlordane containing about 1 ppb of chlordane isomers. The fish concentrated the pesticides more than 200 times (162 and 312 ng/g of cis- and trans-chlordane, respectively). However, the uptake is not enantioselective. The concentration of the principle constituents and their enantiomeric ratio was followed during a fifty days growth period in chlordane free water. The first order decay of concentration was observed with a half time of about 18 days for both the cis- and trans-chlordane isomers. However it was found that the enantiomeric ratio of the trans-chlordane was significantly altered during this short period of time, decreasing from ER = 1 to ER = 0.7, while no enantiomeric changes were observed for the cis-chlordane. It seems that the (â)-trans-chlordane is metabolized significantly faster (t1/2â = 15 days) in the river carp fish than the (+)-trans-enantiomer (t1/2+ = 20 days).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 59, Issue 4, April 2005, Pages 493-500
Journal: Chemosphere - Volume 59, Issue 4, April 2005, Pages 493-500
نویسندگان
Rachadaporn Seemamahannop, Alain Berthod, Michael Maples, Shubhender Kapila, Daniel W. Armstrong,