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人为添加 pb 到土壤中,用顺序提取法进行提取:(1)用去离子水提取土壤溶液中的 pb,提取率<0.1%;(2)用0.5MBaCl_2提取有效态 pb,提取率约为29%;(3)用0.005MDTPA 提取有机络合态 pb,提取率约为38%;(4)用0.1MH_2C_2O_4+0.175M(NH_4)_2C_2O_4提取闭蓄态 pb,提取率约4%;(5)残留态 pb 用 HNO_3+HclO_4消化,约29%。人为添加 pb 到土壤中改变了土壤中 pb 的形态分配比例,有机络合态及有效态增加,惰性态减少。盆栽试验表明,供试植物各器官 pb 浓度与土壤 pb 浓度呈显著性正相关(P<0.01)。
Artificially add pb to the soil, using sequential extraction method for extraction: (1) extracted with deionized water pb in soil solution, the extraction rate was <0.1%; (2) with 0.5MBaCl2 extract effective pb, the extraction rate was about 29 %; (3) 0.005MDTPA extraction of organic complex pb, extraction rate of about 38%; (4) 0.1MH_2C_2O_4 +0.175M (NH_4) _2C_2O_4 extraction of closed pb, the extraction rate of about 4%; Residual pb HNO_3 + HclO_4 digestion, about 29%. Artificially adding pb to the soil changed the proportion of pb in the soil, which increased the organic complex and the available state and decreased the inert state. Pot experiments showed that there was a significant positive correlation between pb concentration and soil pb concentration in all organs tested (P <0.01).