Separation and preconcentration of MnVII/MnII speciation on crosslinked chitosan and determination by flame atomic absorption spectrometry

Abstract

A novel method for the separation and preconcentration of Mn^VII/Mn^II with crosslinked chitosan (CCTS) and determination by flame atomic absorption spectrometry (FAAS) has been developed. The adsorption rate of CCTS for Mn^VII was 98% at pH 3, while Mn^II was not adsorbed. Mn^VII was eluted from the CCTS with 10% (m/v) oxammonium hydrochloride and determined by FAAS. Mn^II was determined from the total manganese present after Mn^II in the water samples was transformed into Mn^VII. The detection limit (3σ, n = 10) for Mn^VII was 1.98 μg l⁻¹ and the relative standard deviation less than 6.6% at the 10 μg l⁻¹ level. The method was applied to environmental water samples with recoveries of between 95–103%.