Rapid determination of Gold in MIBK extracts using Okamoto-cavity microwave-induced plasma atomic emission spectrometry

Yumiko Nishimoto, Kazuaki Wagatsuma

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

An Okamoto-cavity microwave-induced plasma (MIP) with a nitrogen-oxygen gas mixture was employed as an excitation source for emission analysis to observe the behavior of gold in a sol-vent extraction method using 4-methyl-2-pentanone (MIBK). The MIBK extracts were directly aspirated to conduct direct and rapid analysis. The mixed gas plasma could be maintained with a high robustness against the loading of a MIBK solvent. This is probably because the organic solvent can be easily removed due to reactions with active oxygen species in the MIP. The observed emission lines of gold, Au I 242.795 nm and Au I 267.595 nm, were not free from self-absorption especially when the MIBK solution was introduced, because they were atomic reso-nance lines. The Au I 242.795-nm line, which was less sensitive but had a larger dynamic range compared to the Au I 267.595-nm, was employed for the actual application. The detection limit of gold in the MIBK solution was estimated to be 0.0008 g/dm3, based on five-times the standard deviation of the emission intensity in the blank solution. After the MIBK extraction using a 2 M hydrochloric acid solution, the distribution ratio of gold from the aqueous phase to the organic phase could be determined to be more than 200.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalBUNSEKI KAGAKU
Volume58
Issue number3
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Gold
  • MIBK extraction
  • Microwave induced plasma
  • Okamoto-cavity
  • Optical emission spectrometry

ASJC Scopus subject areas

  • Analytical Chemistry

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