黔产山银花及其产地土壤重金属含量分析与评价

目的]探明黔产山银花及其产地土壤重金属污染特征,为山银花品质保障、产地土壤重金属防控及规范化种植提供指导。方法]以贵州山银花及其产地土壤为供试样品,采用ICP-MS测定重金属铜(Cu)、砷(As)、铅(Pb)、镉(Cd)、汞(Hg)、铬(Cr)的含量,采用单因子指数法和内梅罗综合指数法进行分析评价,对黔产山银花及土壤重金属污染水平进行探讨。结果]结果表明:土壤中6种重金属As,Pb,Cd,Cr,Hg和Cu平均含量分别为9.79,14.30,0.10,19.89,0.12和3.81mg/kg,均未超标;根区与非根区土壤的重金属综合污染指数分别为0.46和0.83,污染等级分别处于安全和警戒线。山银花中Cr,As,Cd,Pb,Cu平均含量分别为5.19,0.16,1.87,0.39和6.86mg/kg,Hg未检出;Hg,As,Pb,Cu未超标,而Cd远超出限量值,超标率为100%,山银花对Cd中具有很强的富集效应。结论]研究区土壤环境质量总体适宜山银花种植。

Analysis and Assessment of Heavy Metal Content of Lonicera Hypoglauca and Soil from its Producing Area in Guizhou Province

Objective] The purpose of this study is to research the heavy metal pollution of Lonicera hypoglauca and soil of its producing area, in order to provide guidance for quality guarantee, origin of prevention and control of soil heavy metals and good agricultural practices of L. hypoglauca.Methods] We collected L. hypoglauca and the soil samples from Guizhou Province. The contents of Cu, As, Pb, Cd, Hg, Cr were detected by the ICP-MS. Single factor pollution index and comprehensive pollution index were calculated.Results] The average contents of As, Pb, Cd, Cr, Hg and Cu in soil were 9.79, 14.30, 0.10, 19.89, 0.12 and 3.81 mg/kg, respectively, which satisfied the requirements of national standard(GB15618-1995). The comprehensive soil pollution indexes at root zone and non-root zone were 0.46 and 0.83, respectively, which was safe and below the warning line. The average contents of Cr, As, Cd, Pb and Cu in flower were 5.19, 0.16, 1.87, 0.39 and 6.86 mg/kg, respectively, and Hg was not detected in the flower. The content of Hg, As, Pb and Cu satisfied the requirements of national standard(WM/T 2-2004). The average content of Cd was far beyond the limited level, indicating that L. hypoglauca had a strong ability to concentrate Cd.Conclusion] Soil environmental quality in the study area is suitable for planting L. hypoglauca