5种水培蔬菜对金属元素富集水平研究

检测分析了5种水培蔬菜中4种常量金属元素、18种稀有金属元素以及10种重金属元素含量,并与对照组陆生蔬菜金属元素含量进行比较,评价水培蔬菜的食用安全性。结果表明,污染水体中水培蔬菜的金属元素富集水平是不同的。常量金属元素平均富集系数为2~150倍;稀有元素平均富集量总体上高于陆生蔬菜;重金属元素富集系数大多在10倍左右,与陆生蔬菜重金属元素含量相比,两者均在同一水平,低于国家2001年10月1日执行的蔬菜农产品安全质量标准。

Metal Enrichment of Five Soilless Cultivated Vegetables

Contents of 4 common metal elements(K,Na,Ca and Mg),18 trace metal elements(V,Ba,Sr,Be,Bi,Ti,Sn,Li,Nb,Zr,Ga,Th,Sc,La,Sb,Ni,Ce and Y) and 10 heavy metal elements(Cu,Pb,Zn,Cd,Cr,Co,Ni,Fe,Mn and Mo) in five soilless cultivated vegetables were analyzed for comparison with unpolluted terrestrial vegetables so as to evaluate food safety of the soilless cultivated vegetables.For all the five soilless cultivated vegetables of the polluted water,enrichment level of metal elements was found different.Their average enrichment coefficients of common metal elements were(2-150) times.Their average accumulation of trace metal elements was higher than in the unpolluted terrestrial vegetables.And their enrichment coefficients of heavy metal elements were mostly 10 times.No significant difference was found between the soilless cultivated vegetables and the terristrial vegetables in heavy metal accumulation.Contents of heavy metals in all treated and non-treated vegetables are lower than the national standards for food safety.