2012•Unpublished venueRequires access

Dual-wavelength Dual-indicator Catalytic Spectrophotometric Determination of Trace Manganese(II)

Zhang Ai-ying

Abstract

A new dual-wavelength and dual-indicator catalytic kinetic spectrophotometric method for the determination of trace manganese(Ⅱ) is studied.The method is based on the catalyzing effect of manganese on oxidate discoloring reaction of safranineT and methyl green by KIO4 in the buffer media of HAc-NaAc at pH 4.8.The absorbances in catalytic and uncatalytic systems were measured at 520 nm and 632 nm.The linear range of detemination of manganese(Ⅱ) is 0.010 0 μg/25mL～0.090 0 μg/25mL.The detection limit is 3.0×10-10 g/mL.The method has been used to the determination of trace manganese in tea and the results with satisfactory.

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Key concepts: Manganese, Detection limit, Chemistry, Catalysis, Spectrophotometry, Linear range, Buffer solution, TRACE (psycholinguistics)