中文摘要：

当它能引起长期的健康问题，可得到的 Pb 被庄稼容易吸收，在食物链的 Pb 的累积是大担心之一。在浙江省的污染铅的农业土壤使 Pb 简历可获得性清楚些，一系列植物生长实验在一个温室被执行从五通常使用的提炼之物(0.1 M HC1， 1 M NH4OAc， 0.1 M CaCl2， DTPA 茶和 Mehlich 3 ) 选择更合适的提炼之物。结果证明 1 个 M NH4OAc 罐头最好提取 Pb，然后，显示 Pb 简历可获得性在测试土壤的 DTPA 茶和 0.1 M HC1。以防 1 M NH4OAc 被用作提炼之物，在土壤的批评 Pb 集中是 50.19 mg/kg， 21.16 mg/kg 和 114.00 mg/kg (1 M NH4OAc 提取了 Pb ) 在淤泥的沃土，微黄色红的土壤和略呈紫色的土壤分别地。当价值超过上述时，在中国卷心菜叶子的 Pb 的内容将在食物(GB14935-94 ) 超过铅的中国忍耐限制，作为到经由食物链的人的健康的结果，潜在的生态的风险和危险将出现。

英文摘要：

The accumulation of Pb in the food chain is one of the great concerns as it can cause chronic health problems and the available Pb is easily absorbed by crops. To shed light on Pb bioavailability in lead-contaminated agricultural soils of Zhejiang Province, a series of plant growth experiments were performed in a greenhouse to select more suitable extractants from five commonly used extractants （0.1 M HCl, 1 M NH4OAc, 0.1 M CaCl2, DTPA-TEA and Mehlich 3）. The results showed that 1 M NH4OAc can extract Pb best, indicating the Pb bioavailability, then, DTPA-TEA and 0.1 M HCl in the tested soils. In case 1 M NH4OAc was used as an extractant, the critical Pb concentrations in soils were 50.19 mg/kg, 21.16 mg/kg and 114.00 mg/kg （1 M NH4OAc extracted Pb） in silty loam, yellowish-red soil and purplish soil, respectively. When the values exceed the above ones, the contents of Pb in Chinese cabbage leaves will exceed the Chinese Tolerance Limit of Lead in Foods （GB 14935-94）, as a result, potential ecological risk and hazard to human health via the food chain will appear.