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由于硝酸盐的可溶性,因此它在水体中的存在是非常广泛的。在饮水卫生和环境保护中它的测定也是重要的项目之一。本文研究了用2,6-二甲基苯酚作NO_3~-的测定试剂,用硫酸汞试剂消除Cl~-的干扰,可容许水样中Cl~-的存在达600ppm。用正交试验法研究了最佳的测定条件,在0.45～3,800ppm NO_3~-的浓度范围内,6个样品的平均回收率为95.37％,平均相对偏差为4.12％。方法在310毫微米波长下作NO_3~-的分光光度测定。其表观克分子吸收系数在3,409—3,478,也可
Due to the solubility of nitrate, its presence in water is very extensive. Its determination in drinking water sanitation and environmental protection is also one of the important projects. In this paper, the use of 2,6-dimethylphenol as a reagent for the determination of NO_3 ~, with mercury sulfate reagent to eliminate the interference of Cl ~ - can tolerate the presence of Cl ~ - in water samples up to 600ppm. The optimum conditions were studied by orthogonal test. The average recoveries of six samples were 95.37% and the average relative deviation was 4.12% in the range of 0.45 ~ 3,800 ppm NO_3 ~ -. Methods The spectrophotometric determination of NO_3 ~ at 310 nm was performed. The apparent molecular absorption coefficient of 3,409-3,478, can also be