提出了一种利用已知过量的亚硝酸盐与氨基磺酸反应,对氨基磺酸进行分光光度测定的方法.未反应的亚硝酸根采用其与对硝基苯胺及N-(1-萘基)乙二胺二盐酸盐(NEDA)之间的重氮偶合反应来测定.所生成的偶氮染料的最大吸收波长为545 nm,实测摩尔吸光度为6.1×104 L/(mol·cm).该方法可用于测量总体积为25 mL的样品中0～25μg的氨基磺酸.当样本数为10时,测定15μg氨基磺酸的相对标准偏差为2%.将该方法用于测定镍、铅、铁、钌、铟等金属的氨基磺酸盐电镀液废水中氨基磺酸的含量,其结果采用加标回收率方法进行了验证.
A proposed spectrophotometric method for the determination of sulfamic acid involves reaction of sulfamic acid with known excess of nitrite.The unreacted nitrite is determined by diazo coupling reaction involving P-nitroaniline and N-(1-naphthyl)ethylenediamine dihydrochloride [NEDA].The absorption maximum(λmax)for the formed azo dye is at 545 nm and the calculated molar absorptivity is 6.1 x 104L/(mol·cm).The method iS useful for determining sulfamic acid in the range of 0-25μg in an overall volume of 25 mL,and the relative standard deviation iS 2%for n=10 at 15 μg level of sulfamic acid.The developed method was applied to the determination of sulfamic acid in the effluents of nickel,lead,iron,ruthenium and indium sulfamate electroplating baths.The results obtained were validated by recovery studies of added sulfamic acid.
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