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首页> 外文期刊>Environmental toxicology and chemistry >INFLUENCE OF Ca AND pH ON THE UPTAKE AND EFFECTS OF Cd IN FOLSOMIA CANDIDA EXPOSED TO SIMPLIFIED SOIL SOLUTIONS
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INFLUENCE OF Ca AND pH ON THE UPTAKE AND EFFECTS OF Cd IN FOLSOMIA CANDIDA EXPOSED TO SIMPLIFIED SOIL SOLUTIONS

机译：Ca和pH对简化土壤溶液中大黄花病菌吸收和镉吸收的影响

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摘要

The present study sought to quantify the components of a biotic ligand model (BLM) for the effects of Cd on Folsomia Candida (Collembola). Assuming that soil porewater is the main route of exposure and to exclude the effects of soil particles on metal availability, animals were exposed for 7 d to different Cd concentrations between 0.1 mM and 100 mM in simplified soil solutions at different Ca concentrations (0.2 mM, 0.8 mM, 3.2 mM, and 12.8 mM) or at different pH (5.0, 6.0, and 7.0). Higher Ca concentrations decreased the toxicity of Cd (adult survival) in test solutions, whereas toxicity was slightly lower at pH 7 and 6 than at pH 5, suggesting a mitigating effect of Ca and to a lesser extent pH on Cd toxicity to F. Candida. Internal Cd concentrations in the animals increased with increasing exposure level but were significantly reduced by increasing Ca concentrations and were not significantly affected by pH. By using Langmuir isotherms, binding constants for Cd, Ca, and protons and the fraction of binding sites occupied by Cd were calculated and used to predict effects of Cd on survival. Predicted toxicity showed a good agreement with measured responses when Ca and pH were used as separate factors or combined together. The present study shows indications of protective effects of Ca but less of protons on the toxicity and uptake of Cd in F. Candida on exposure to simplified soil solutions, which can be described using the principles of a biotic ligand model.
机译：本研究试图量化生物配体模型（BLM）中Cd对念珠菌（Collembola）的影响。假设土壤孔隙水是暴露的主要途径，并且排除了土壤颗粒对金属有效性的影响，则在简化的土壤溶液中，在不同的Ca浓度（0.2 mM，0.1 mM和100 mM， 0.8 mM，3.2 mM和12.8 mM）或在不同的pH值（5.0、6.0和7.0）下。较高的Ca浓度会降低测试溶液中Cd的毒性（成人存活率），而在pH 7和6时的毒性略低于pH 5时的毒性，这表明Ca的缓解作用以及pH值对Cd对念珠菌毒性​​的缓解程度较小。 。动物体内的Cd浓度随暴露水平的增加而增加，但随着Ca浓度的增加而显着降低，并且不受pH值的显着影响。通过使用Langmuir等温线，可以计算Cd，Ca和质子的结合常数以及Cd所占结合位点的比例，并用于预测Cd对存活的影响。当将Ca和pH用作单独因素或组合在一起时，预测的毒性显示出与测得的响应良好的一致性。本研究表明了钙的保护作用，但质子对F.假丝酵母中Cd的毒性和吸收的保护作用较小，这可以使用生物配体模型的原理来描述。

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