土壤汞生物可给性的影响因素研究——基于体外模拟(in vitro)法  

Influence of soil properties on the Hg bioaccessibility in polluted soils investigated by in vitro digestion approachaes

作　　者：郑顺安 韩允垒[4] 刘代丽 倪润祥 吴泽嬴 师荣光 ZHENG Shunan;HAN Yunlei;LIU Daili;NI Runxiang;WU Zeying;SHI Rongguang(Rural Energy and Environment Agency,Ministry of Agriculture and Rural Affairs,Beijing,100125,China;Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources,Ministry of Agriculture and Rural Affairs,Beijing,100125,China;Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin,300191,China;Chinese Association of Agricultural Science Society,Beijing,100125,China)

机构地区：[1]农业农村部农业生态与资源保护总站,北京100125 [2]农业农村部资源循环利用技术与模式重点实验室,北京100125 [3]农业农村部环境保护科研监测所,天津300191 [4]中国农学会,北京100125

出　　处：《环境化学》2019年第12期2665-2671,共7页Environmental Chemistry

基　　金：国家重点研发计划(2017YFD0801401,2017YFD0801205)资助~~

摘　　要：选取22种典型土壤,应用2种in vitro(模拟体外试验)方法——SBET法(simple bioaccessibility extraction test,生物有效性简化提取法)和PBET法(physiologically-based extraction test,生物原理提取法),定量阐明土壤性质对Hg生物可给性的影响.结果表明,SBET法中Hg的生物可给性为2.91%—35.65%,平均值为13.26%;PBET法中Hg的生物可给性为1.33%—8.69%,平均值为3.93%.所有土壤均表现为SBET法中Hg的生物可给性显著高于PBET法.pH及有机质含量是SBET法和PBET法中决定Hg生物可给性的关键影响因子,分别可以解释67.8%和81.8%的Hg生物可给性的变化;但两种方法中二者的影响程度不同:SBET法中,土壤有机质含量的影响更大,PBET法中,则是pH的影响更大.研究结果表明,污染土壤中Hg的生物可给性可以根据土壤中Hg总量、pH和有机质含量进行预测.A total of 22 surface soil samples were collected from different areas in China in order to investigate the influence of soil properties on the bioaccessibility of mercury(Hg).The bioaccessibility of Hg was evaluated by two in vitro extraction approaches.One is simple bioaccessibility extraction test(SBET)and the other is physiologically-based extraction test(PBET).The results showed that the bioaccessibility of Hg in the 22 soil samples extracted by SBET was for 2.91%—35.65%,with on average 13.26%,while that extracted by PBET varied from 1.33%—8.69%,with on 3.93%.The bioaccessibility of Hg in the soils extracted by SBET was significantly higher than that by PBET for all the soil samples.Multiple regression analysis showed that Hg bioaccessibility was related to pH and organic matter of soil.Using SBET method,the most important factor was soil organic matter,and the next one was soil pH,while using PBET method.The most important factor was soil pH,and the next one was soil organic matter.The finding could support the data that the bioaccessibility variation of Hg in 22 soil samples were 67.8%and 81.8%from SBET and PBET schemes,respectively.To conclude,this investigation proved a more convenient way of predicting potential ecological risks of Hg in soils by determining the properties(pH,organic matter)of several soil types.

关 键 词：in VITRO 试验 HG 土壤性质 生物可给性 影响因素 

分 类 号：X53[环境科学与工程—环境工程]