Abstract
The methods of manufacturing test placers and compositions for visual-blister colorimetric determination of concentrations of phosphate ions and sulfi te ions for their quantitative determination in soils and water bodies have been optimized. The test placer contains all the reagents for the analytical reaction. Placers allow the quantitative determination of phosphates and sulfi des in aqueous samples without prior preparation of reagent solutions. In a blister cell with a diameter of 6 mm, a much more intense color was achieved with a solution layer of no more than 2 mm. The application of reagents to the surface of homogenized and discolored hemp awns avoids their contact until the chemical analytical reaction takes place. The composition of placers and the conditions for applying reagents are optimized. Suffi ciently high acidity can be provided by hydrosulfate ions with the addition of a few drops of solution. The reaction proceeds in the volume of the added test solution, which is 2-3 drops.
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