Microchip-Based Liquid–Liquid Extraction Using Isotope Dilution ICP-MS for Trace Copper Determination in Steels

• Published in: Solvent Extraction Research and Development, Japan Vol. 17; pp. 111 - 119
• Main Authors: KAGAWA, Tsuyoshi, OHNO, Masashi, SEKI, Tatsuya, CHIKAMA, Katsumi
• Format: Journal Article
• Language: English
• Published: Japan Association of Solvent Extraction 2010
• ISSN: 1341-7215; 2188-4765
• DOI: 10.15261/serdj.17.111

We demonstrated microchip-based solvent extraction and back extraction using isotope dilution inductively coupled plasma mass spectroscopy (IDMS/ICP-MS) for trace copper determination in steels. In this method, copper was rapidly separated from the matrix element and its concentration was determined. Cu was extracted into o-xylene using 8-hydroxyquinoline at pH 7 and back extracted with 0.1 mol L−1 nitric acid at a flow rate of 20 μL min−1. The Cu concentration was determined using IDMS. The time taken for the extraction/back extraction was about 1 s on the microchip and the total measurement time using IDMS/ICP-MS was about 40 s per sample. The proposed method was used for Cu determination in a JSS601-10 steel standard. The obtained analytical results were in good agreement with the certified values.