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Updated: Jun 8, 2026

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
Published on: August 31, 2017
A simple colorimetric FIA method for the determination of pyrite oxidation rates
Owen D Osborne1, Allan Pring, Claire E Lenehan
1School of Chemical and Physical Sciences, Flinders University, Adelaide, Australia.
Abstract:
A method for the rapid determination of the oxidation rate of naturally occurring pyrite (FeS(2)) samples is presented. The progress of the oxidation reaction was followed by measurement of the concentration of total dissolved iron using flow injection analysis. Iron was determined using UV-vis detection after reaction with the colorimetric reagent 5-sulfosalicylic acid in the presence of ammonia. The calibration function was linear between 5 and 150 mg L(-1), and the detection limit was 0.46 mg L(-1). The relative standard deviation was typically less than 1% (n=10) and the measurement frequency was 60/h. The method was used to quantify the oxidation rate of 10 ground and cleaned pyrite samples (53 μm
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