Calcium-hardness colorimetric determn. in water - using Complexon III (EDTA), Murexide and sodium (bi)carbonate

摘要

Compsn. for detecting Ca in water and its aprox. concn. consists of 995 mg NaHCO3 (or NaCO3) + 5 mg. complexon III (EDTA), for each dose, and 50 mg Murexide for 100 doses. A colouration is produced indicative of hydrotimetric degree of hardness (TH) of the water:- violet =20 TH; rose 20 TH; yellow max. TH. Pref. used in form of tablets, pastilles, of sachets contg. powder or granules.