长沙市售新鲜蔬菜中硝酸盐含量的测定

以长沙市售13种主要蔬菜为材料,采用紫外分光光度法测定其硝酸盐含量。结果表明,不同类型蔬菜中的硝酸盐含量差异很大,其趋势为叶菜类>根菜类>瓜类>茄果类;同一类型蔬菜中的硝酸盐含量也不相同;且所测市售蔬菜中硝酸盐含量与国标相比,除冬瓜、黄瓜和茄子超标外,其余均达到食用标准。

Determination of Nitrate Content in Vegetables in Changsha's Market

Thirteen kinds of vegetables from Changsha’s market were used as test materials and the nitrate content was directly determined by the UV-spectrophotometric method.The results demonstrated that the contents of nitrate in different vegetables varied significant,vegetables basically corresponded with the following tendency: leafy vegetables > root vegetables > gourd vegetables > golanaceous vegetables.Different kinds of vegetables of the same classification obviously had different levels of nitrate content;and different kinds of vegetable in Changsha city reached sanitation standard when cornpared with the national standard except white gourd,cucumber and eggplant.