Application of the Sulfur Recovery Method by the Kiba Reagent for the Subsequent Isotope Analysis of Natural Sulfates and Sulfuric Acid

A simple and reliable method for sulfate reduction using the Kiba reagent is adapted for the preparation of trace amounts of natural sulfates and sulfuric acid for isotopic (δ 34 S, δ 33 S and δ 36 S) sulfur analysis. It is shown that the method is successfully applicable for the preparation of samples of sulfates and sulfuric acid with a sulfur content of 0.1 mg for isotopic analysis of 34 S, 33 S, and 36 S isotopes. The accuracy of δ 34 S determination in natural sulfates was ±0.3‰, the accuracy of δ 34 S, ∆ 33 S, and ∆ 36 S measurement in sulfuric acid was ±0.5, ±0.027, and ±0.38‰, respectively.