Application and validation of a biotic ligand model for calculating acute toxicity of lead to Moina dubia in lakes of Hanoi, Vietnam

Abstract

It is increasingly being recognized that biotic ligand models (BLMs) are valuable in the risk assessment of metals in aquatic systems. The authors investigated the effect of pH, Ca, Mg, K, Na on the acute toxicity of Pb to Moina dubia, native zooplankton in lakes of Hanoi, Vietnam. Calcium, Magnesium and pH strongly in uenced acute Pb toxicity to Moina dubia. Based on this data set, a acute Pb-BLM for Moina dubia was developed according to condition of Hanoi lakes. The developed BLM was shown, in an independent validation with data on acute toxicity test on natural water sets, to be capable of predicting chronic Pb toxicity with 81.3% accuracy. The results proved that BLM can be useful tool for calculating the acute toxicity based on water-quality criteria in lake of Hanoi.

Influence of environmental factors on changes in the speciation of Pb and Cr in sediments of Wuliangsuhai Lake, during the ice-covered period

“…Heavy metals can persist in the environment and disrupt the biochemical and physiological systems of plants, animals, and humans. Speci cally, Pb can be absorbed by organisms through water, air, and nutrients and disrupt nucleic acid and protein formation, antioxidant enzyme activity, and cell membrane function (Yabe et al, 2015;Hu et al, 2016;Chen et al, 2019;Kataba et al, 2021;Kataba et al, 2021;Aytekin, 2022;Pham et al, 2022). Cr is the second most common metal contaminant in groundwater, soil, and sediments, and Cr occurs in two main oxidation states in surface water, as an immobile and less soluble Cr(III) under reducing conditions and as a mobile, toxic, and bioavailable Cr(VI) under oxidising conditions.…”