The reduced inorganic sulfur fraction of 4 acid sulfate soil (ASS) materialswas quantified using a variety of peroxide oxidation procedures. Thetemperature and duration of the peroxide oxidation were found to markedlyaffect the peroxide oxidisable sulfur determination. For 3 ASS materials withlow total carbon content (i.e. <2.5% C), peroxide oxidisable sulfurunderestimated the reduced inorganic sulfur fraction, with the peroxideoxidisable sulfur determinations being as low as 42% of thosedetermined using chromium reducible sulfur technique. The precipitation ofjarosite during peroxide oxidation was a major factor contributing to theunderestimation of reduced inorganic sulfur in these materials. Apparentlosses of sulfur of approximately 25% on average occurred duringperoxide oxidation budget accounting; this also contributed towards theobserved underestimation of reduced inorganic sulfur. It is most likely thatthese unaccounted losses are due to atmospheric losses of sulfur. In a peatASS, one of the peroxide oxidation methods overestimated the reduced inorganicsulfur fraction and was attributed to the release of a large reserve oforganic sulfur in this material by the peroxide. This study shows the peroxideoxidation methods examined here are subject to substantial interferences.Consequently these peroxide oxidation methods are unable to reliably provideaccurate measurements of the reduced inorganic sulfur fraction in ASSmaterials.pyritic sulfur, peroxide oxidisable sulfur, chromium reducible sulfur,jarosite, sulfur budget.
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.