کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4484220 1316913 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exposure of the marine deposit feeder Hydrobia ulvae to sediment spiked with LAS congeners
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Exposure of the marine deposit feeder Hydrobia ulvae to sediment spiked with LAS congeners
چکیده انگلیسی

The lethal and sub-lethal toxicity of LAS congeners to the mollusc gastropod Hydrobia ulvae were assessed in spiked sediment bioassays. This complements the little knowledge available to date on mixture effects in the sediment compartment. The LAS homologues joint effect was concentration additive (∑TUi = 0.8–1). As opposed to the 10-d LC10 based on the sediment associated LAS concentration (91–330 mg/kg) which was independent of the homologue chain length, the LC10 based on the dissolved LAS fraction (0.804–0.068 mg/L) decreased as the homologue chain length increased from 10 to 13 carbons. The quantitative structure-activity relationship (QSAR) derived from these data was log (1/LC10 (mol/L)) = 0.64 log Kow + 4.40 (n = 5; r2 = 0.76; s = 0.24). It showed an apparent higher toxicity compared to the typical QSAR for polar narcosis in water-only systems probably due to the simultaneous exposure of the snail to LAS through the dissolved and the sediment associated fractions. The egestion rate of the surviving snails recovered after few days' exposure (1-d NOEC: 40–107 mg/kg, 9-d NOEC: 65–190 mg/kg) which suggests that the organisms were able to acclimate to LAS during the exposure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 44, Issue 9, May 2010, Pages 2831–2840
نویسندگان
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