Abstract：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 R2being 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.
钟茂生, 彭超, 姜林, 韩丹, 夏天翔, 姚珏君, 郑迪. 污染场地土壤中Cd人体可给性影响因素及对筛选值的影响[J]. 中国环境科学, 2015, 35(7): 2217-2224.
ZHONG Mao-Sheng, PENG Chao, JIANG Lin, HAN Dan, XIA Tian-Xiang, YAO Jue-Jun, ZHENG Di. Factors controlling bioaccessibility of Cd in soils from contaminated sites and its implication on soil screening values. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(7): 2217-2224.
