不同土壤孔隙度对DGT提取Cd有效态含量的影响研究  

Effects of Soil Porosity on Available Cd Content Extracted by DGT

作　　者：宋志廷 赵玉杰[1,2] 周其文[2] 刘潇威[2] 潘杨[2] 田娜娜[1,2] 穆莉[2] 师荣光[2] 

机构地区：[1]沈阳农业大学土地与环境学院,沈阳110866 [2]农业部环境保护科研监测所,天津300191

出　　处：《中国农学通报》2016年第12期139-144,共6页Chinese Agricultural Science Bulletin

基　　金：公益性行业(农业)科研专项项目"农产品产地重金属污染安全评估技术与设备开发"(201403014-01)

摘　　要：DGT是评价重金属有效性的重要工具,但是DGT的提取受到土壤孔隙度的影响,而目前为止还缺乏相关研究。笔者采用不同磨细程度的土壤来改变土壤孔隙度,研究不同土壤孔隙度的变化对DGT提取重金属Cd有效态含量的影响。结果表明:磨细改变了土壤的孔隙度,进而影响了土壤扩散边界层,从而对土壤Cd有效态的3种计算表达形式CDGT、CE、C′E均产生了影响,且对CDGT的影响最大。但当对这些影响因素进行逐步综合考虑后,结果表明,磨细造成的孔隙度变化对土壤有效态Cd含量影响有限,其变异性均小于10%,只是在计算时应综合考虑孔隙度及扩散边界层的变化,从而减小计算造成的误差。DGT is an important tool for the evaluation of heavy metal effectiveness, but the DGT extraction is affected by soil porosity, and so far still lacks relevant research. The authors used different levigation levels ofsoil to change the soil porosity, studied the effect of soil porosity on the available Cd content extracted by DGT.The results showed that levigation changed the soil porosity, thereby affected the soil diffusion boundary layer,and then affected the three expression forms of available Cd（CDGT, CE and C′E）, and had the biggest impact onCDGT. After an overall consideration of those influencing factors, the results indicated that the porosity changescaused by levigation had limited impact on soil available Cd content, its variability was less than 10%, but the porosity and diffusion boundary layer change should be considered in calculation to reduce the error.

关 键 词：DGT 土壤孔隙度 扩散边界层 

分 类 号：X8[环境科学与工程—环境工程]