Primary-Secondary Wavelengths Spectrophotometric Determination of Manganese in Environmental Water

Abstract

At pH 9.5 the conventional reaction of manganese (Mn²⁺) with formaldehyde 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 and gave
the higher determination sensitivity than the ordinary spectrophotometry.
The relative standard deviations were less than 7.4% and the recovery rate
of Mn between 97 and 109%.