UBM表征老化土壤中Pb的可给性及影响因素  

Bioaccessibility of Pb in aged soil characterized by UBM and its controlling factor

作　　者：钟茂生[1] 赵莹[1] 韩丹[1] 姜林[1] 彭超[1] 张澎[1] ZHONG Mao-sheng;ZHAO Ying;HAN Dan;JIANG Lin;PENG Chao;ZHANG Peng(Beijing Municipal Research Institute of Environmental Protection,Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, National Urban Environment Pollution Control Engineering Techniques Research Center, Beijing 100037, China)

机构地区：[1]北京市环境保护科学研究院,污染场地风险模拟与修复北京市重点实验室,国家城市环境污染控制工程技术研究中心,北京100037

出　　处：《中国环境科学》2017年第5期1866-1871,共6页China Environmental Science

基　　金：环境保护公益性行业科研专项(201409047)

摘　　要：采用UBM方法对采自大连和株洲的11个土样中Pb的人体可给性进行表征,结果显示,土样中Pb在胃阶段的人体可给性为21.1%~77.9%,平均值为54.5%;肠提取阶段的人体可给性0.2%~4.2%,平均值为0.7%.Pb在胃阶段可给性浓度与土样中总Pb、锰、磷含量正相关性明显,而肠阶段可给性浓度与总Pb以及胃阶段Pb可给性浓度正相关明显.土样中弱酸可提取态Pb、可还原态Pb以及可氧化态Pb与胃、肠阶段Pb可给性浓度显著正相关,对其贡献较大.此外,BCR表征为残渣态的Pb在酸性胃液中部分依然可溶解.Unified Bioaccessibility Method(UBM)assay was used to characterize the bioaccessibility of Pb in11soils from Dalian and Zhuzhou.The results revealed that the bioaccessiblity of Pb in stomach covered between21.1%and77.9%with the average being54.5%while those in intestine ranged between0.2%and4.2%with the average being0.7%.Significant positive correlation between the total Pb,manganese and phosphate content and the bioaccessible Pb concentration in stomach was observed while the bioaccessible Pb in intestine correlated well with the concentration of total Pb in soil and bioaccessible Pb content in stomach.Significant positive correlation between the bioaccessible Pb concentration in stomach and intestine and the weak acid extractable,reducible and oxidative Pb was observed,and most bioaccessible Pb was contributed by the weak acid extractable,reducible and oxidative Pb.In addition,parts of residual Pb characterized by sequential extraction method(BCR)could be dissolved in acidic solution in gastric phase.

关 键 词：UBM BCR PB 可给性 影响因素 

分 类 号：X53[环境科学与工程—环境工程]