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藏红T与亚硝酸根在0.1mol/l的盐酸溶液中可形成红色配合物,在600nm处有最大吸收。ε600nm=7.39×10~3l·mol~(-1)·cm~(-1),桑德尔灵敏度为9.34×10~(-3)μg/cm~2。亚硝酸盐氮含量在0～3μg/ml范围内遵守比尔定律。显色液在室温下避光放置可稳定6小时以上。亚硝酸盐氮含量为2μg/ml时,11次平行测定的标准偏差为1.14×10~(-3),相对标准偏差为0.22％,该方法用于湖水、河水、污水等水样中亚硝酸盐氮的分析,获得满意的结果。
Red Tibetan T and nitrite in 0.1mol / l of hydrochloric acid solution can form a red complex with maximum absorption at 600nm. ε600nm = 7.39 × 10 ~ 3l · mol ~ (-1) · cm ~ (-1), and the sensitivity of Sander was 9.34 × 10 ~ (-3) μg / cm ~ 2. Nitrite nitrogen content in the range of 0 ~ 3μg / ml obey Bill’s law. Color-developing solution can be stable for 6 hours or more at room temperature under dark conditions. The standard deviation of 11 parallel determinations was 1.14 × 10 ~ (-3) and the relative standard deviation was 0.22% when the content of nitrite was 2μg / ml. The method was applied to the determination of nitrite in water samples such as lake, river and sewage Salt and nitrogen analysis, to obtain satisfactory results.