上海浦东地区蔬菜硝酸盐与亚硝酸盐污染现状分析

对上海市浦东农业区蔬菜样品进行硝酸盐含量测定．结果表明：不同种类蔬菜硝酸盐含量高低依次为叶菜类、瓜类、豆类、茄果类，大棚蔬菜硝酸盐含量明显高于大田．对蔬菜硝酸盐含量评价结果表明：大棚部分叶菜类蔬菜硝酸盐污染严重；杭白菜、空心菜、毛菜、苋菜与青菜已达三级污染水平，其中毛菜三级污染指数达1．28．蔬菜亚硝酸盐含量大小为叶菜类〉豆类〉茄果类〉瓜类，其中生菜、毛菜、扁豆、空心菜和苋菜超标，占样品总数的13．9％．

Analysis on the Present Nitrate and Nitrite Pollution of Vegetable in Pudong of Shanghai City

Both nitrate and nitrite contents of vegetable samples from the agricultural area in Pudong,Shanghai,were measured.The results showed that the nitrate content in the vegetable samples decreased orderly as leaf vegetables,melons,beans and eggplants,and the nitrate content of vegetables cultivated in the greenhouse was much higher than that of vegetables of open field.Some leaf vegetables of greenhouse were seriously polluted by the nitrate,the nitrate-induced pollution in Chinese cabbage,swamp morningglory,chicken's feather veggie,amaranth,and greengrocery reached the third grade level,and specially the nitrate-induced pollution index of chicken's feather veggie was 1.28.The nitrite content in vegetable samples was in order of leaf vegetables>legumes>eggplants>melons,and the nitrite content of lettuce,chicken's feather veggie,haricot bean,swamp morningglory and amaranth,which accounted for 13.9% of the total vegetables,exceeded the pollution standard.