鹤山市蔬菜中硝酸盐和亚硝酸盐及Vc的含量研究

Contents of Nitrate,Nitrite and Vitamin C of Vegetables in Heshan City

测定了鹤山市产15种蔬菜中的硝酸盐、亚硝酸盐和Vc的含量。参考蔬菜中硝酸盐含量分级评价标准和我国制定的无公害蔬菜亚硝酸盐含量限量标准,考虑到各种蔬菜Vc的含量,对这15种蔬菜的食用安全水平评价如下:黄瓜的果实、丝瓜的果实、茄子的果实、豆角的果实、芋的的果实和莲藕的茎属于一级蔬菜,可以安全食用,甚至允许生食;生菜的叶和萝卜的果实属于二级蔬菜范围,不宜生食,煮熟或盐渍均可安全食用;菜心的叶、小白菜的叶、通心菜的叶、芥蓝的叶和番薯的叶属于三级蔬菜范围,不可生食和盐渍,可熟食;小白菜的叶柄和根、芥菜的叶和油荬菜的叶属于四级蔬菜范围,菜心的叶柄和根、通心菜的茎和根属于五级蔬菜范围,这两级食用安全水平的蔬菜不宜食用或限量食用,如长期大量食用可能会对人体健康带来风险。

The contents of nitrate, nitrite and vitamin C in different edible parts of 15 vegetables purchased from Heshan were determined. According to the limit standards for nitrate and nitrite pollution at home and aboard, the safety of 15 vegetables were evaluated. The fruits of Cucumber, towel gourd, Aubergine, Legume and Dasheen and the caudexes of Lotus root belong to the first class vegetables can be eaten in fresh, after salted or cooked. The leaves of Lettuce and the fruits of Radish belong to the second class vegetables, which can be eaten after salted or cooked. The leaves of Flowering Cabbage, Little Cabbage, Water Convolvulus, Chinese Kale and Sweet potato belong to the third class vegetables, which can only be eaten after cooked. The petiole and the root of Little Cabbage, the leaves of Chinese Mustard and Lettuce belong to the fourth class vegetables. The petiole and the root of Flowering Cabbage and Caudexes and the root of Water Convolvulus belong to the fifth class vegetables. The last two class vegetables were inedible or can be eaten in limited quantifies.