摘要
以水杨酸消化法和原子光谱吸收法分别测定吉首市 2 5种常见蔬菜硝酸盐积累量及重金属铅、镉、汞的质量分数 (含量 ) .结果表明 ,95 %以上蔬菜中的硝酸盐积累程度超过世界卫生组织对食品中的硝酸盐限量标准 ,受到不同程度的污染 ;其中芹菜的硝酸盐质量分数最高 (2 .2 37× 10 -3 ) ,其次为小白菜 (2 .177× 10 -3 )和菠菜 (2 .16 9× 10 -3 ) ,红苋菜的硝酸盐质量分数最低只有 3.2 1× 10 -4 .有 1种达一级标准 ,2种达二级标准 ,15种达三级标准 ,7种达四级标准 .而调查的蔬菜中重金属Pb ,Hg ,Cd的质量分数均未超出其限值 。
The contents of nitrate and heavy metal Pb、Hg、Cd of 25 kinds of vegetable from Jishou count of Hunan province have been analyzed.The results showed that more than 95% kinds of vegetable have been polluted by nitrate, and none of them were polluted by heavy metal Pb,Hg,Cd yet, according to the restricted standard of food at the contents of nitrate and heavy metal, made by WHO in 1973.
基金
湖南省自然科学基金资助项目 (99JJY2 0 0 2 4)
