Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, Shandong, 266109, PR China; College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, PR China.
Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, Shandong, 266109, PR China.
Ecotoxicol Environ Saf. 2019 Oct 30;182:109433. doi: 10.1016/j.ecoenv.2019.109433. Epub 2019 Jul 15.
In order to explore the effects of pH and accompanying ions on divalent cobalt (Co(II)) toxicity to the wheat root elongation, an improved biotic ligand model (BLM) to predict Co(II) toxicity was developed in solution culture. The results showed that the Co(II)-toxicity decreased with the increases of K, Ca and Mg activities, and the activity of Na had no impact on the Co(II)-toxicity. High H activity reduced the Co(II)-toxicity by the competitive effect of H, while low H activity affected the toxicity by the change in the type of Co(II) in culture medium. Co and CoOH were toxic to wheat root elongation, and Co(OH) was not. On the basis of BLM theory, the conditional equilibrium constants for Co, CoOH, H, Mg, Ca, K were obtained: logK = 4.65, logK = 6.62, logK = 4.53, logK = 3.65, logK = 2.36 and logK = 2.17. Free Co and CoOH, and the competitions of K, Mg and Ca were suggested to be considered when developing the Co(II)-BLM.
为了探索 pH 值和伴随离子对二价钴（Co(II)）对小麦根伸长毒性的影响，在溶液培养中开发了一种改进的生物配体模型（BLM）来预测 Co(II)毒性。结果表明，Co(II)毒性随 K、Ca 和 Mg 活性的增加而降低，Na 活性对 Co(II)毒性没有影响。高 H 活性通过 H 的竞争作用降低了 Co(II)毒性，而低 H 活性通过培养基中 Co(II)类型的变化影响了毒性。Co 和 CoOH 对小麦根伸长有毒，而 Co(OH)则没有。基于 BLM 理论，得到了 Co、CoOH、H、Mg、Ca、K 的条件平衡常数：logK=4.65、logK=6.62、logK=4.53、logK=3.65、logK=2.36 和 logK=2.17。建议在开发 Co(II)-BLM 时考虑游离 Co 和 CoOH 以及 K、Mg 和 Ca 的竞争。
