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地质通报  2010 

珠江三角洲平原广东省佛山市顺德区土壤-蔬菜系统中Pb的健康安全预测预警

, PP. 1662-1676

Keywords: Pb,富集系数,健康风险,靶标危害系数,预测预警,珠江三角洲

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Abstract:

分析珠江三角洲顺德区208个蔬菜地表层土样、114个蔬菜样Pb的全量和38个表层土样Pb的形态含量,结果表明,土壤Pb平均值为44.3mg/kg,77.5%的土壤Pb含量超过广东省土壤背景值,蔬菜Pb超标率为74.6%。用2007年蔬菜土壤Pb的累积速率(1.02mg/kg),预测未来10年土壤Pb含量变化趋势,并分别以150、270、300和8580(mg/kg)为阈值对土壤中Pb进行预警,2007―2017年超过150mg/kg的土壤面积比例有所增加,而超过270mg/kg、300mg/kg的土壤面积比例不变。蔬菜Pb与土壤Pb的全量或有效量之间均存在“高原模式”。蔬菜Pb的空间分布表明,3种蔬菜Pb的高浓度主要位于工业比较发达的城镇,这与土壤Pb的空间分布大体一致。经蔬菜途径吸收Pb的THQ靶标危害系数不超过0.4。不同区域、家庭经济收入水平的THQ排序:THQ高>THQ城市>THQ中>THQ农村>THQ低,表明经济收入水平高的家庭经蔬菜途径摄入Pb的健康风险最高。

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