FIELD: analytical chemistry.
SUBSTANCE: invention relates to the field of analytical chemistry and relates to a method for photometric determination of the amount of iron in an aqueous solution of the test sample. The method consists in adding an acid and an indicator to an aqueous solution of the test sample in an amount effective for the formation of a colored complex. After adding the acid, the mixture is heated to 37–40°C and maintained at this temperature for a day to obtain a ferric iron solution. After adding the indicator, the amount of ferric iron in the colored complex is determined by the spectrophotometric method. Hydrochloric acid is used as an acid, and an aqueous solution of ammonium thiocyanate is used as an indicator, and hydrochloric acid is added in excess relative to the solution of the test sample.
EFFECT: increasing the accuracy and reliability of determining low concentrations of iron in colloidal solutions, suspensions, and dispersions.
2 cl, 5 dwg, 5 tbl
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