Determination of trace impurities of iron and ferric oxide in high purity microsilica by ion chromatography

doi:10.3724/SP.J.1123.2016.06047

Abstract

Abstract:

A method for detecting trace impurities of iron and ferric oxide in high purity microsilica was established by ion chromatography with post column derivatization plus UV detection. The separation of ferric and ferrous was achieved on Thermo Scientific Dionex^TM IonPac^TM CS5A column containing anion and cation exchange functional groups with 2,6-pyridinedicarboxylic acid (PDCA) solution elution. The target compounds were derivatized with 4-(2-pyridylazo)resorcinol (PAR) and detected at 530 nm. The limits of detection for ferrous and ferric were 0.013 mg/kg and 0.006 mg/kg respectively. Both of the linear correlation coefficients for ferrous and ferric were better than 0.999. The recoveries of ferrous and ferric were 79%-90% and 92%-105% respectively. The method provides high sensitivity, high accuracy and high selectivity for the detection of ferrous and ferric in microsilica, which would be used for monitoring the different sources of iron in microsilica industry.

Key words: ferric oxide, ferrous, ion chromatography (IC), microsilica, post column derivatization

CLC Number:

O658

LUO Jin, ZHENG Hongguo, LI Renyong, ZHAO Haineng, LI Chao, ZHAO Jiong, LI Chunlin. Determination of trace impurities of iron and ferric oxide in high purity microsilica by ion chromatography[J]. Chinese Journal of Chromatography, 2016, 34(10): 976-981.

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