Spektrochemische bestimmung von sulfat bzw. Chlorid mit roentgenfluoreszenz nach anreicherung durch mitfällung an BaCrO4 BZW. AgSCN aus verdünnten lösungen

Sulphate and chloride are quantitatively co-precipitated from dilute solutions (10^?5- 10^?4M) with BaCrO₄ and AgSCN respectively, and determined in the precipitate by X-ray fluorescence spectroscopy. Ratios of count-rates I_S/I_Cr and I_Cl/I_Sfor the appropriate K_α-lines are used for quantitative evaluation by comparison with reference standards prepared the same way. The method enables both sulphate and chloride to be determined in 50–100 ml of tap-water with a reproducibility of about 3%.