New metallochromic indicator for barium: Determination of sulfate in water and soil extracts |
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| Authors: | Yu. M. Dedkov N. V. Korsakova V. A. Sychkova |
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| Affiliation: | (1) Moscow State Regional University, ul. Radio 10a, Moscow, 105007, Russia;(2) Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia;(3) Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119015, Russia |
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| Abstract: | A new metallochromic indicator for barium, Orthanilic NM, is synthesized and proposed. The color reaction of Orthanilic NM with barium ions is compared with the reactions of carboxyarsenazo and other orthanilic group reagents, such as Orthanilic K, nitchromazo, etc. The quantitative characteristics of the reactions are determined. It is shown that Orthanilic NM can be used for the titrimetric (down to 20 mg/L) and photometric (down to 0.2 mg/L) determinations of sulfate. Substantial amounts of conventional anions, alkali, alkaline-earth, and nonferrous metals do not interfere with the titrimetric determination (at pH 2.5). For the photometric determination, a 1:1 Ba2+-Orthanilic NM complex is used at pH 2. In these conditions, sulfite and phosphate do not interfere with the determination either. Procedures are developed for the determination of sulfate in various types of water and soil extracts. Examples of their practical application are given. |
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