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利用ＮＯ－３在氨介质中和二氯化锰的催化作用下，用Ｚｎ粉还原成ＮＯ－２发生重氮化反应，然后加入Ｎ－（１－萘基）乙二胺使溶液发生偶联反应显色，在波长５５０ｎｍ处测定吸光度．其ε＝３．４９×１０４Ｌ／ｍｏｌ·ｃｍ在４８～４８０μｇ／Ｌ范围符合比耳定律，相对标准偏差为０．２８％，回收率为９９．４％，对实际样品分析结果满意．
Utilizing the catalytic action of NO-3 in ammonia medium and manganese dichloride, diazotization is carried out by reduction of Zn powder into NO-2, and then the solution is coupled by adding N- (1-naphthyl) ethylenediamine The reaction color, measured at a wavelength of 550nm absorbance. The ε = 3.49 × 104 L / mol · cm was in the range of 48 ~ 480 μg / L. Beer’s law was obeyed. The relative standard deviation was 0.28% and the recovery rate was 99.4%. The results of the real samples were satisfactory.