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将镀铜镉柱应用于流动注射(FIA),通过三通阀自动控制,实现了水中硝酸盐氮和亚硝酸盐氮的同时测定。在盐酸介质中,亚硝酸盐与磺胺发生重氮化,然后与N-(1-萘基)-乙二胺盐酸盐相偶合,形成玫瑰红色的偶氮染料,在530nm处有较大吸收,硝酸盐被镉柱在线还原为亚硝酸盐后同法测定。硝酸盐和亚硝酸盐的测定范围分别为2～50μg/L、20～1000μg/L,检出限分别为0.33μg/L和0.66μg/L,精密度RSD为0.73%和1.48%,测定频率为16样/h。实际水样中硝酸盐和亚硝酸盐的测定取得了满意的效果,加标回收率均在95.3%～111.0%之间。该方法简单、快速、重现性好,可应用于实际检测。
The copper-plated cadmium column was applied to flow injection (FIA), which was automatically controlled by a three-way valve to achieve the simultaneous determination of nitrate and nitrite in water. In a hydrochloric acid medium, nitrite is diazotized with sulfonamide and then coupled with N- (1-naphthyl) -ethylenediamine hydrochloride to form a rose-red azo dye with a greater absorption at 530 nm , Nitrate by cadmium column online reduction to nitrite after the same method. The detection limits of nitrate and nitrite were 2 ~ 50μg / L, 20 ~ 1000μg / L, the detection limits were 0.33μg / L and 0.66μg / L, the precision RSD was 0.73% and 1.48% 16 samples / h. The actual water samples nitrite and nitrite determination has achieved satisfactory results, the spike recoveries were between 95.3% ~ 111.0%. The method is simple, rapid, reproducible and can be applied to the actual test.