Speciation of Manganese Using a Pneumatic Flow Injection Analysis-Tandem Spectrometer System

摘要

A pneumatic flow injection-tandem spectrometer system,without a delivery pump,was used for the speciation of manganese(Mn).In this system the suction force of the pneumatic nebulizer of a flame atomic absorption spectrometer(FAAS)was used for solution delivery through the manifold.Mn(VII)and total Mn(Mn(VII)and Mn(II))concentrations were determined using a UV-Vis spectrometer and FAAS,respectively.The Mn(II)concentration was determined by the difference between the two.The calibration curves were linear up to 15.00 mg L~(-1)for Mn(VII)and total Mn,with a detection limit of 0.08 mg L~(-1)and 0.05 mg L~(-1)for Mn(VII)and Mn,respectively.The mid-range precision and accuracy were < 1.89% and ± 2.50% for the 2 species,respectively,at a sampling rate of 80 samplings h~(-1).This system was used for the determination of Mn(VII)and Mn(II)in spiked and natural water,as well as industrial water.