摘要
采用Unified bioaccessibility model（UBM）模拟胃肠消化的方法测试了来自湖南、广西和大连12个污染土壤样品中cd的人体可给性．结果显示，cd在胃提取阶段的可给性为12．24%~81．10％，平均值为53．60％，肠提取阶段的可给性为2．01％-43．30％，平均值为19．74％．胃提取阶段的可给性浓度仅与总镉（TCd）（P〈O．000，n=12）和总锰（TMn）（P=o．04，F12）显著正相关，肠提取阶段的可给性浓度与TCd（P〈O．001，n=12）、胃阶段Cd的可给性浓度（P〈0．001，F12）以及n佃（P=0．05，n=12）均显著正相关．胃阶段基于土壤中TCd和TP含量能较好的预测cd在胃阶段的可给性浓度，模型决定系数（R2^）达到0．992，肠阶段基于cd在胃阶段的可给性浓度及土壤pH值能较好的预测其在肠阶段的可给性浓度皿。达到0．999．考虑土壤中cd在胃中的可给性时，居住及工商业情形下土壤筛选值分别提升至未考虑可给性时的1．8倍（以可给性平均值计算）和1．2倍（以可给性最大值计算）．考虑土壤中cd在肠阶段的可给性时，居住及工商业情形下土壤筛选值分别提升至未考虑可给性时的5．0倍（以可给性平均值计算）和2．3倍（以可给性最大值计算）．
Unified bioaccessibility model （UBM） was used to measure cadmium （Cd） bioaccessibility of 12 soils with different physic-chemical properties and concentrations from Hunan, Guangxi and Dalian. The results revealed that the bioaccessibility of Cd in stomach was 12.24%-81.10% with the average value being 53.60% while in intestine it was 2.01%-43.30% with the average value being 19.74%. The bioaccessible concentration in stomach correlated well with total Cd （TCd） （P〈0.000, n---12） and total Mn （TMn） （P=-0.04, n=12） in soils while in intestine the most significant controlling factor was TCd （P〈0.001, n=12）, followed by bioaccessible concentration in stomach （P〈0.001, n=12） and TMn （P=0.05, n=12）. A model regressed based on TCd and total phosphate （TP） can predict the bioaccessible concentration in stomach very well with R2 being 0.992, and the bioaccessible concentration in intestine can be predicted precisely using a model regressed based on bioaccessible concentration in stomach and soil pH with Rebeing 0.999. When the bioaccessibility in stomach was considered the soil screening values for residential and industrial was 1.8 （calculated based on the average bioaccessibility） and 1.2 （calculated based on the maximal bioaccessibility） times the values without considering Cd bioaccessibility while the screening levels were 5.0 （calculated based on the average bioaccessibility） and 2.3 （calculated based on the maximal bioaccessibility） times the values when bioaccessibility in intestine was taken into account.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2015年第7期2217-2224,共8页
China Environmental Science
基金
北京市科委重大项目(D08040000360000)
中意污染场地管理国际合作项目
关键词
CD
污染场地
土壤
人体可给性
影响因素
筛选值
cadmium
contaminated sites
soil
bioaccessibility
controlling factors
screening values
