کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4453796 1620811 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling of acute cadmium toxicity in solution to barley root elongation using biotic ligand model theory
ترجمه فارسی عنوان
مدل سازی مسمومیت حاد کادمیوم در محلول به زرد شدن ریشه جو با استفاده از نظریه مدل لیگاند زیستی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
چکیده انگلیسی

Protons (H+) as well as different major and trace elements may inhibit cadmium (Cd) uptake in aquatic organisms and thus alleviate Cd toxicity. However, little is known about such interactions in soil organisms. In this study, the independent effects of the cations calcium (Ca2 +), magnesium (Mg2 +), potassium (K+), H+ and zinc (Zn2 +) on Cd toxicity were investigated with 5-day long barley root elongation tests in nutrient solutions. The tested concentrations of selected cations and trace metal ions were based on the ranges that occur naturally in soil pore water. The toxicity of Cd decreased with increasing activity of Ca2 +, Mg2 +, H+ and Zn2 +, but not K+. Accordingly, conditional binding constants were obtained for the binding of Cd2 +, Ca2 +, Mg2 +, H+, and Zn2 + with the binding ligand: logKCdBL 5.19, logKCaBL 2.87, logKMgBL 2.98, logKHBL 5.13 and logKZnBL 5.42, respectively. Furthermore, it was calculated that on average 29% of the biotic ligand sites needed to be occupied by Cd to induce a 50% decrease in root elongation. Using the estimated constants, a biotic ligand model was successfully developed to predict the Cd toxicity to barley root elongation as a function of solution characteristics. The feasibility and accuracy of its application for predicting Cd toxicity in soils were discussed.

Relationship between the measured and predicted values of the EC50{Cd2 +} based on the BLM developed in the present study.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Sciences - Volume 42, April 2016, Pages 112–118
نویسندگان
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