FIELD: chemistry.
SUBSTANCE: in the method for photometric determination of chromium (III) in pure salt solutions, which includes conversion to a complex compound in xylenol orange in a weakly acidic medium, chromium (III) solution with pH 3.0-3.8 is mixed with a 200-fold amount of xylenol orange and a 200-fold amount complexion III and 0.1-0.2 ml surfactant solution. The surfactant is obtained by adding up to 100 ml water to 0.2 g gelatine. The volume of the solutions is then increased to 10 ml with water, followed by heating on a water bath at 60-80°C for 15 minutes.
EFFECT: invention increases sensitivity of photometric determination of chromium.
1 dwg, 4 ex
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