[Modification and validation of the spectrophotometric method of trace amounts of antimony determination in different types of mineral water].

In order to improve limit of determination, a modification of the analytical procedure for spectrophotometric determination of antimony in water recommended by Polish Standards has been proposed. The modified procedure was validated on the basis of the analytical studies of samples of deionised water enriched in different amounts of the analyte, and its precision, limit of determination, sensitivity, accuracy and linearity range were established. A correction describing the effect of the matrix, determined on the basis of analyses of four types of mineral water differing in the degree of total mineralisation and chemical composition, and allowing the use of the procedure proposed for determination of antimony at the level of < or = 0.005 mg/dm3, has been derived.