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首页> 外文期刊>Eurasian Journal of Analytical Chemistry >A Spectrophotometric Method for the Determination of Nitrite and Nitrate
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A Spectrophotometric Method for the Determination of Nitrite and Nitrate

机译：分光光度法测定亚硝酸根和硝酸盐。

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A simple, rapid spectrophotometric method for the determination of nitrite and nitrate in water, tablets and water samples have been developed. Determination of nitrite is based on the reactions involving sulfanilic acid with methyl anthranilate as the coupling agents and determination of nitrate is based on their reduction to nitrite in the presence of Zn/NaCl. The produced nitrite is subsequently diazotized with sulfanilic acid then coupled with methyl anthranilate to form an azo dye which is measured at 493 nm. The method is optimized for acidity, amount of reagents required and tolerance amount of other ions. The range of linearity for sulfanilic acid-methyl anthranilate couple was found to be 0.2-8.0 µg/ml of nitrite with molar absorptivity be 1.03x104 Lmol-1cm-1 and sandell’s sensitivity 4.5x10-3 µg cm-2
机译：建立了一种测定水，片剂和水样中亚硝酸盐和硝酸盐的简单，快速的分光光度法。亚硝酸盐的测定基于磺胺酸与邻氨基苯甲酸甲酯作为偶联剂的反应，硝酸盐的测定基于在Zn / NaCl存在下将其还原为亚硝酸盐。所产生的亚硝酸盐随后用磺胺酸重氮化，然后与邻氨基苯甲酸甲酯偶合以形成偶氮染料，该偶氮染料在493nm下测量。该方法针对酸度，所需试剂量和其他离子的耐受量进行了优化。发现对氨基苯磺酸氨基磺酸对氨基磺酸酯的线性范围是0.2-8.0 µg / ml的亚硝酸盐，摩尔吸收率为1.03x104 Lmol-1cm-1和sandell的灵敏度为4.5x10-3 µg cm-2

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