At pH 9.5the conventional reactionn of manganese (Mn~(2+)) with formal-dehyde and hydroxylamine hydrochloride to form red complex has been applied for the improvement of the determination of trace amounts of manganese in natural water and waste water by the updated method named primary-secondary wavelengths spectrophotometry (PSWS). The results showed that the analytical precision and accuracy were increased anf gave the higher determination sensitivity than the ordinary spectrophotometry. The relative standard devivtions were less than 7.4% and the recovery rate of Mn between 97 and 109%.
展开▼
