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随着人民生活水平的提高和科学知识的增加,迫切需要优质无公害的蔬菜供应市场。硝酸盐是亚硝酸盐的前体物质,有致癌作用,并存在于叶菜类中。因此,研究如何降低叶菜中硝酸盐氮的含量并为此寻找一个简单、快速、准确的测定方法,具有重要的意义。目前测定蔬菜硝酸盐氮的方法,一般用酚二磺酸比色法或紫外分光光度法等。但这些方法存在着操作繁杂、时间较长或者设备昂贵的缺点。用硝酸根电极测定硝酸盐氮,我国在环保、卫生、土壤、
With the improvement of people’s living standards and scientific knowledge, there is an urgent need for a market of high-quality and pollution-free vegetables. Nitrates are precursors of nitrite, have carcinogenic effects and are found in leafy vegetables. Therefore, it is of great significance to study how to reduce the content of nitrate nitrogen in leaf vegetables and to find a simple, rapid and accurate method for determination of nitrate nitrogen in leaf vegetables. The current method of determining nitrate nitrogen in vegetables, generally with phenol disulfonic acid colorimetric or UV spectrophotometry. However, these methods have the disadvantages of complicated operation, longer time or expensive equipment. Determination of nitrate nitrogen nitrate electrode, China in environmental protection, health, soil,