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Iron isotopes offer an excellent opportunity for detailed tracing of natural processes because of the range of stable isotopes (54, 56, 57, 58) and the importance of iron redox transitions in biochemical and inorganic processes. In this paper, a significantly improved mass spectrometric technique for iron isotopic analysis is described that utilises ion pulse counting detection and is calibrated with an absolute iron isotope abundance standard. All four stable iron isotopes are quantified in a single analysis to approximately 0.1 % precision and accuracy using a low temperature (1200 C) silica gel/boric acid technique on an improved source filament assembly composed of platinum and ceramic. Filament loads of 100-1000 ng can be utilised through implementation of an ultraclean work environment, improved chemistry, and a source designed specifically to minimise isobaric interference in the mass 50-60 region.

Additional information

Authors: DIXON P R ET AL., Los Alamos National Laboratory, New Mexico (US);MAECK R, JRC Geel (BE)
Bibliographic Reference: Article: Analytical Chemistry, Vol. 65 (1993) pp. 2125-2130
Record Number: 199311606 / Last updated on: 1994-11-28
Original language: en
Available languages: en