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首页> 外文期刊>International Journal of Environmental Research and Public Health >A Comparative Study on the Uptake and Toxicity of Nickel Added in the Form of Different Salts to Maize Seedlings
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A Comparative Study on the Uptake and Toxicity of Nickel Added in the Form of Different Salts to Maize Seedlings

机译：不同盐分形式对玉米幼苗镍吸收和毒性的比较研究

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In soil ecotoxicological studies, a toxic metal is usually added in the form of either an inorganic or organic salt with relatively high solubility. Nitrate, chloride, acetate, or sulfate are commonly considered as valid options for that aim. However, recent studies have shown that different salts of the same metal at the same cationic concentration may exhibit different toxicities to plants and soil organisms. This information should be considered when selecting data to use for developing toxicological criteria for soil environment. A comparative study was carried out to evaluate the toxicity of five nickel (Ni) salts: NiCl2, NiSO4, Ni(II)-citrate, Ni(CH3COO)2, and Ni(II)-EDTA (ethylenediaminetetraacetate), on maize seedlings. The plant metrics used were plant height, shoot and root biomass, leaf soluble sugars and starch, and the Ni contents of the shoots and roots. The results indicated that when Ni was added to the soil, toxicity varied with the selected anionic partner with the following toxicity ranking NiSO4 < Ni(CH3COO)2 < Ni(II)-citrate < NiCl2 < Ni(II)-EDTA. Taking the plant-height metric as an example, the effective concentrations for 50% inhibition (EC50) were 3148 mg·kg?1 for NiSO4, 1315 mg·kg?1 for NiCl2, and 89 mg·kg?1 for Ni(II)-EDTA. Compared with the Ni in the other salts, that in Ni(II)-EDTA was taken up the most efficiently by the maize roots and, thus, resulted in the greatest toxic effects on the plants. Nickel generally reduced leaf soluble sugars, which indicated an effect on plant carbohydrate metabolism. The outcome of the study demonstrates that different salts of the same metal have quite different ecotoxicities. Therefore, the anionic counterpart of a potentially toxic metal cation must be taken into account in the development of ecotoxicological criteria for evaluating the soil environment, and a preferred approach of leaching soil to reduce the anionic partner should also be considered.
机译：在土壤生态毒理学研究中，通常以具有较高溶解度的无机或有机盐的形式添加有毒金属。硝酸盐，氯化物，乙酸盐或硫酸盐通常被认为是达到该目的的有效选择。但是，最近的研究表明，在相同的阳离子浓度下，相同金属的不同盐对植物和土壤生物的毒性可能不同。选择用于制定土壤环境毒理学标准的数据时，应考虑该信息。进行了一项比较研究，以评估五种镍（Ni）盐：NiCl2，NiSO4，柠檬酸Ni（II），Ni（CH3COO）2和Ni（II）-EDTA（乙二胺四乙酸盐）对玉米幼苗的毒性。使用的植物指标是植物高度，枝条和根系生物量，叶片可溶性糖和淀粉以及枝条和根系中的Ni含量。结果表明，当将Ni添加到土壤中时，毒性随所选的阴离子配偶体而异，其毒性等级依次为NiSO4

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