کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6312467 | 1308507 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of water chemistry on the chronic toxicity of lead to the cladoceran, Ceriodaphnia dubia
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
As the first step toward parameterization of a chronic lead (Pb) biotic ligand model (BLM) for Ceriodaphnia dubia, 7-d toxicity tests were performed in waters modified to evaluate the influences of hardness, DOM (as Suwannee River NOM and Aldrich humic acid (HA)), pH (buffered with 4 mM MOPS) and alkalinity on the chronic toxicity of Pb. Calculated EC20s for the control base water test and each of the most extreme modified test waters were as follows in μg Lâ1 Pb (95% confidence interval): base water control=45 (14-53), 5 mM CaSO4=22 (12-30), 32 mg Lâ1 DOM=523 (388-573), 2.5 mM NaHCO3=73 (21-120) and pH 6.4 buffered with MOPS=3.9 μg Lâ1 Pb (1-5). Results indicate that hardness does not protect against chronic toxicity of Pb to C. dubia, whereas HA does protect at the highest concentration tested (597 μM). Additionally, our findings suggest that low pH increases the chronic toxicity of Pb whereas increased alkalinity is protective. The findings reported herein support the need for a chronic Pb BLM as an alternative approach to hardness-based regulations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 74, Issue 3, March 2011, Pages 238-243
Journal: Ecotoxicology and Environmental Safety - Volume 74, Issue 3, March 2011, Pages 238-243
نویسندگان
Edward M. Mager, Kevin V. Brix, Robert M. Gerdes, Adam C. Ryan, Martin Grosell,