Analytical Sciences

Simple Spectrophotometric Flow Injection System with an In-valve Minicolumn for Enhancement during the Determination of Chromium(III) Using EDTA

Somchai LAPANANTNOPPAKHUN,*^,** Supharphorn KASUWAS,* Lucksagoon GANRANOO,* Jaroon JAKMUNEE,*^,** and Kate GRUDPAN*^,**

*Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
**Institute for Science and Technology Research and Development, Chiang Mai University, Chiang Mai 50200, Thailand

A simple spectrophotometric flow injection (FI) procedure for the determination of Cr(III) using ethylenediaminetetraacetic acid (EDTA) was developed. An FI system with a column packed with Amberlite IR-120(H) was employed for sample pretreatment. This leads to the possibility of a single standard calibration. A linear calibration in a range of 10 - 27 µg Cr(III) was obtained with a detection limit of 1 µg Cr(III) and RSD of 2% (18 µg Cr(III), n = 12). The proposed procedure was applied for determination of Cr(III) in leachate and dietary supplement samples. The results agreed with those obtained by the standard methods.

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