Guangdong Subcenter of National Center for Soybean Improvement, Guangzhou, 510642, China.
Bull Environ Contam Toxicol. 2014 Apr;92(4):427-32. doi: 10.1007/s00128-014-1218-5. Epub 2014 Feb 13.
Crops produced on metal-polluted agricultural soils may lead to chronic toxicity to humans via the food chain. To assess metal pollution in agricultural soils and soybean in southern China, 30 soybean grain samples and 17 soybean-field soil samples were collected from 17 sites in southern China, and metal concentrations of samples were analyzed by graphite furnace atomic absorption spectrophotometer. The integrated pollution index was used to evaluate if the samples were contaminated by Cd, Pb, Zn and As. Results showed that Cd concentration of 12 samples, Pb concentration of 2 samples, Zn concentration of 2 samples, and As concentrations of 2 samples were above the maximum permissible levels in soils. The integrated pollution index indicated that 11 of 17 soil samples were polluted by metals. Metal concentrations in soybean grain samples ranged from 0.11 to 0.91 mg kg(-1) for Cd; 0.34 to 2.83 mg kg(-1) for Pb; 42 to 88 mg kg(-1) for Zn; and 0.26 to 5.07 mg kg(-1) for As, which means all 30 soybean grain samples were polluted by Pb, Pb/Cd, Cd/Pb/As or Pb/As. Taken together, our study provides evidence that metal pollution is an important concern in agricultural soils and soybeans in southern China.
受金属污染的农田生产的农作物可能会通过食物链导致人类慢性中毒。为了评估中国南方农业土壤和大豆中的金属污染，我们从中国南方 17 个地点采集了 30 个大豆籽粒样本和 17 个大豆田土壤样本，并使用石墨炉原子吸收分光光度计分析了样本中的金属浓度。采用综合污染指数来评估 Cd、Pb、Zn 和 As 是否对样本造成了污染。结果表明，有 12 个样本的 Cd 浓度、2 个样本的 Pb 浓度、2 个样本的 Zn 浓度和 2 个样本的 As 浓度超过了土壤的最大允许浓度。综合污染指数表明，17 个土壤样本中有 11 个受到了金属污染。大豆籽粒样本中的金属浓度范围为：Cd 为 0.11-0.91mg/kg；Pb 为 0.34-2.83mg/kg；Zn 为 42-88mg/kg；As 为 0.26-5.07mg/kg，这意味着 30 个大豆籽粒样本均受到了 Pb、Pb/Cd、Cd/Pb/As 或 Pb/As 的污染。综上所述，我们的研究表明，金属污染是中国南方农业土壤和大豆中的一个重要问题。
