The method describes how to determine the chlorine dioxide content of water photometrically with a cuvette test.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Chloride ions are found in natural waters in a wide range of concentrations. A high chloride content can be the result of substantial contamination. In brewing liquor, chloride can have an impact on the character of the beer. At higher concentrations (approx. > 100 mg/l), it can induce corrosion in brewing equipment, even of stainless steel (in hot water, approx. > 50 mg/l).
Transformation of chloride solutions in the presence of mercury thiocyanate produces less-dissociated mercury(I) chloride. An equivalent quantity of thiocyanate ions is released simultaneously, forming iron(III) thiocyanate with iron(III) salts. The red hue resulting from the reaction is determined photometrically.