利用在酸性条件下亚硝酸盐与对氨基苯磺酸重氮化后,再与盐酸萘乙二胺偶合形成颜色反应,建立了用比色法测定茶叶中亚硝酸盐的方法。针对茶叶中存在的茶多酚、茶色素和抗坏血酸等干扰因素,优化了测定的最佳技术参数。建立的方法在所测的范围内具有良好的线性（相关系数为0.9993）,变异系数为4.6%,回收率为72.90%~86.53%。本方法快速,准确、操作简单,适用于茶叶中的亚硝酸盐含量的测定。

A spectophotometric method on the determination of nitrite in tea was investigated, which is based on the diazotization of nitrite with p-aminobenzene sulfonic acid under acidic conditions then coupled with N-(1-Naphthyl)- ethylenediamine dihydrochloride in forming the colour-producing response. Because of the interference of polyphenols, pigment and ascorbic acid in tea, the optimum operating conditions of measurement was established. The method showed a good analytical characteristics with correlation coefficients of 0.9993, variation coefficient of 4.6%, and recovery was ranging from 72.90% to 86.53%. It is a rapid, accurate, simple method and applicable for the determination of nitrite in tea.