Substoichiometric Separation and Isotope Dilution Mass Spectrometry of Iron(III) Based on the Synergistic Extraction with 4-Isopropyltropolone and 3, 5-Dichlorophenol

Abstract

Substoichiometric isotope dilution mass spectrometry (SIDMS) as a new analytical method has been proposed for the accurate determination of iron. Iron(III) was extracted with a substoichiometric amount of 4- isopropyltropolone (Hipt) in xylene or heptane in the presence of 3, 5-dichlorophenol (DCP) as a synergist and then subjected to the isotope measurement (⁵⁴Fe) with amicrowave-induced plasma mass spectrometer. For more precise determination, ⁵⁹Co was used as an internal standard. In this method, the correction of the mass discrimination of isotope measurement is not required and the use of expensive enriched stable isotopes can be avoided.