Physiologically based in vitro test was used to study Pb bioaccessibility change in Pb-contami-nated urban soil after the addition of phosphate rock, single super-phosphate, bone meal, vermiculite, zeolite and bentonite in this paper. The results indicated the Pb bioaccessibility in the gastric and small intestinal phase decreased to some extent after the addition of different amendments; the addition of P-containing amendments was found to reduce Pb bioaccessibility more effectively than clay mineral amendments. The addition of 2% bone meal was the best treatments and the Pb bioaccessibility decreased by 20. 64% in the gastric phase and 57. 94% in the small intestinal phase.%运用基于模拟人体生理溶液的体外试验,研究了铅(Pb)污染城市土壤加入磷矿粉、过磷酸钙、骨粉、蛭石、沸石、膨润土后土壤Pb的生物可给性的变化.结果表明:加入不同的含磷和黏土矿物改良剂后,模拟胃和小肠阶段的Pb的生物可给性降低,含磷改良剂处理降低幅度大于黏土矿物处理.加入w=2％的骨粉效果最佳,在模拟胃和小肠阶段Pb的生物可给性分别降低了20.64％和57.94％.
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