Rooney Corinne P, Zhao Fang-Jie, McGrath Steve P
Agriculture and Environment Division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.
Environ Pollut. 2007 Jan;145(2):596-605. doi: 10.1016/j.envpol.2006.04.008. Epub 2006 Jun 2.
We investigated the influence of soil properties on Ni toxicity to barley root and tomato shoot growth, using 16 European soils. The effective concentration of added Ni causing 50% inhibition (EC(50)) ranged from 52 to 1929mgkg(-1) and from 17 to 920mgkg(-1) for the barley and tomato test, respectively, representing 37- and 54-fold variation among soils. Soil cation exchange capacity was the best single predictor for the EC(50). The EC(50) based on either the Ni concentration or free Ni(2+) activity in soil solution varied less among soils (7-14 fold) than that based on the total added Ni, suggesting that solubility of Ni is a key factor influencing its toxicity to plants. The EC(50) for free Ni(2+) activity from the barley test decreased with increasing pH, indicating a protective effect of protons. The results can be used in the risk assessment of Ni in the terrestrial environment.
我们使用16种欧洲土壤，研究了土壤性质对镍对大麦根系和番茄地上部生长毒性的影响。在大麦和番茄试验中，导致50%抑制率的添加镍的有效浓度（EC(50)）分别为52至1929mgkg(-1)和17至920mgkg(-1)，表明土壤间存在37倍和54倍的差异。土壤阳离子交换容量是EC(50)的最佳单一预测指标。基于土壤溶液中镍浓度或游离镍(2+)活性的EC(50)在土壤间的变化（7至14倍）小于基于总添加镍的变化，这表明镍的溶解度是影响其对植物毒性的关键因素。大麦试验中游离镍(2+)活性的EC(50)随pH值升高而降低，表明质子具有保护作用。这些结果可用于陆地环境中镍的风险评估。
