Phytotoxicity and bioavailability of cobalt to plants in a range of soils

阅读量：

作者：

HF Li，C Gray，Carolina Micro，FJ Zhao，SP Mcgrath

展开

摘要：

Risk assessments of existing substances, including metals, in the environment are being carried in the European Union, which require estimation of the predicted no-effect concentration (PNEC) derived from biological toxicity assays. Few toxicity data exist for Co and higher plants, and the influence of soil properties on Co toxicity also needs to be evaluated systematically. We investigated phytotoxicity and bioavailability of Co to barley () ranged from 40 to 1708mgkg, from 7 to 966mgkg and from 7 to 733mgkg for the barley, OSR and tomato test, respectively, representing 43-, 138-, and 105-fold variation among soils. The EC based on the Co concentration in soil solution varied less among soils (4–15 fold) than that based on the total added Co, suggesting that solubility of Co is a key factor influencing its toxicity to plants. Regressions of soil Co toxicity threshold values with various soil properties, showed that exchangeable calcium (Ca) concentration was the most consistent single predictor. For risk assessment, we suggest that Co toxicity threshold values for plants be normalised using the soil exchangeable Ca.

展开

关键词：

cobalt phytotoxicity bioavailability soil properties risk assessment

DOI：

10.1016/j.chemosphere.2008.12.068

被引量：

191

年份：

2009