Preparation of MICTE and Its Application in Speciation Analysis of Chromium in Environmental Waters

摘要

In this paper, a manual-controlled injection nanometer calcium titanate based on glass fiber filter enricher (MICTE) was prepared, and its application in speciation of Cr(III) and Cr(VI) was studied. The optimum experimental parameters for separation of the Cr(III) and Cr(VI) have been investigated. The results showed that the MICTE had adsorption capacity towards the Cr(III) and Cr(VI). And two forms of chromium show different adsorption capacities at different pH values, Cr (III) could be adsorbed at pH ≥ 9, but Cr(VI) can't be adsorbed. Whereas Cr (VI) retained at pH ≤ 3, but Cr(III) can't be adsorbed. Therefore, it is possible that the two forms of chromium are complete separated. The Cr(III) and Cr(VI) could be completely eluted with 1 mol·L~(-1) HCl and 1 mol·L~(-1) NaOH, respectively. The chromium concentration was measured by atomic absorption spectroscopy. A new method for determination of the speciation of chromium in environmental water samples based on the manual-controlled injection enricher and atomic absorption spectroscopy determination was proposed. The method was successfully applied for the determination of Cr(III) and Cr(VI) in environmental waters with satisfactory results.