天津近郊与远郊菜地中硒与重金属差异性研究  

Study on the Difference of Selenium and Heavy Metals in Suburban and Outer Suburban Vegetable Fields of Tianjin

作　　者：谢薇[1,2] 杨耀栋 侯佳渝[3] 李国成 菅桂芹 XIE Wei;YANG Yao-dong;HOU Jia-yu(Tianjin Geological Mineral Test Center,Tianjin 300191;Tianjin Supervision Center of Geology of Mineral Resources,The Ministry of Land and Resources,Tianjin 300191;Tianjin Planning and Natural Resources Bureau Geological Center,Tianjin 300042)

机构地区：[1]天津市地质矿产测试中心,天津300191 [2]国土资源部天津矿产资源监督检测中心,天津300191 [3]天津市规划和自然资源局地质事务中心,天津300042

出　　处：《安徽农业科学》2019年第20期88-93,共6页Journal of Anhui Agricultural Sciences

摘　　要：在天津近郊与远郊各选1块具有代表性菜地,同步采集土壤与蔬菜样品,分析土壤与蔬菜中的Se与重金属含量特征,同时对蔬菜中Se与重金属元素进行相关性分析。结果表明,近郊与远郊菜地表层土壤Se的平均含量分别为0.93和0.35 mg/kg,各自达到富硒土壤和足硒土壤标准。近郊菜地中Cd、Hg、Cu和Zn的平均含量分别为1.29、1.26、110.07和272.73 mg/kg,均远高于天津市的背景值,而且Cd和Cu的含量高于风险筛选值;远郊菜地中仅Hg的含量高于背景值。近郊菜地和远郊菜地中均以毛豆的Se含量最高,近郊菜地中葱是最富集Cd和Hg的蔬菜种类,而远郊菜地中则以叶类蔬菜中的Cd和Hg含量较高。蔬菜中Se和Cd、Hg、Zn和Cu的相关性在2块菜地中表现完全一致,此外,Se与Hg呈显著的负相关,而Se与Zn和Cu则表现出明显的正相关性。A representative vegetable field was selected in suburb and outer suburb respectively of Tianjin.Soil and vegetable samples were collected together to analyze the characteristics of selenium and heavy metals in soil and vegetable,and the correlation between selenium and heavy metals in vegetable was analyzed.The results showed that the average selenium contents of surface soil in suburb and outer suburb were 0.93, 0.35 mg/kg,respectively,which met the selenium-rich soil and sufficient selenium soil standards.The average contents of Cd,Hg,Cu and Zn in suburb vegetable field were 1.29,1.26,110.07 and 272.73 mg/kg,respectively,which were much higher than the background values of Tianjin,and the contents of Cd and Cu were higher than the risk screening values.Only Hg in outer suburban vegetable field was higher than the background value.In suburban vegetable field and outer suburban vegetable field,the selenium content of soybean was the highest.In suburban vegetable field,green Chinese onion was the most cadmium and mercury-rich vegetable category,while in outer suburban vegetable field,leafy vegetables had the highest cadmium and mercury content.The correlation between selenium and cadmium,mercury,zinc and copper in vegetable was identical in the two vegetable plots.In addition,selenium was negatively correlated with mercury,while selenium was positively correlated with zinc and copper.

关 键 词：天津 菜地 硒 重金属 

分 类 号：X173[环境科学与工程—环境科学] X53