Express method of the quantitative determination of nitrites by computer colorimetry using new reagent compositions
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- 作者：D. Yu. Marchenko ; S. I. Petrov…
- 关键词：test methods ; operational control ; sodium nitrite ; nitrite salt ; diazotization ; azo coupling ; azo dyes ; colorimetry method ; color reactions ; chromogenic reagent ; metrological characteristics ; computer colorimetry
- 刊名：Theoretical Foundations of Chemical Engineering
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：50
- 期：4
- 页码：648-654
- 全文大小：810 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Industrial Chemistry and Chemical Engineering
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1608-3431
- 卷排序：50
文摘
The possibilities of using new reagent compositions based on diazo and azo dyestuff components that contain sulfonic groups are considered to determine nitrites in the presence of the contents of chlorides. New reagent compositions based on 1-hydroxynaphthalene-3,6-disulfonic acid in combination with 2,6- nitroorthanilic and 2,6-dichlorosulfanilic acids have been used to create indicator powders and indicator papers for the quantitative test determination of nitrite ions. Test methods based on sustainable indicator powders and indicator papers have been developed with the use of the ilPro portable spectrophotometer and PlustekSmartPhoto P60 compact mobile scanner combined with the Vuescan universal scan program. It has been shown that the sensitivity of the visual determination of nitrites in liquids using indicator papers is 0.5 mg/L. The sensitivity of the test method that uses indicator papers, the PlustekSmartPhoto P60 mobile scanner, and the ilPro portable spectrophotometer is 0.2 mg/L. Upon using the indicator powder and i1Pro portable spectrophotometer, the range of defined concentrations of nitrite ions is 0.01–5 mg/L.