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分析研究了兰州市18种蔬菜中硝酸盐含量,结果表明:①约有9种蔬菜硝酸盐含量部分或全部超过我国暂行标准;②不同品种硝酸盐含量不同。
The nitrate content of 18 kinds of vegetables in Lanzhou City was analyzed and studied. The results showed that: (1) Some or all of the nitrate content of some vegetables exceeded the provisional standards of our country; (2) The content of nitrate in different varieties was different.