Abstract
An analytical scheme suitable for boreal acid sulphate (AS) soils and sediments was developed on the basis of existing methods. The presented procedure can be used to quantify and discriminate among acid volatile sulphide, cold chromium reducible sulphur, hot chromium reducible sulphur, elemental sulphur, sulphate sulphur, organic sulphur, total reducible sulphur and total sulphur. The sulphur fractions are recovered as either Ag2S or BaSO4 precipitates and can further be used for isotope analysis. Overlaps between sulphur species are common during speciation, and must be minimized. Some of these overlaps are caused by poor sampling and storage, inappropriate conditions during the distillation, or natural variations in the sample (e.g. Fe3+ interference and grain size). The procedural impact was determined by conducting tests on both artificial and natural samples containing one or several sulphur species. The method is applied on reduced sediment from an AS soil locality (Överpurmo) and a brackish lake (Larsmo Lake) in western Finland and the results, including S-isotopes, are discussed.;
Highlights
Australia, and significant areas along the boreal coastal plains of Finland and Sweden (Palko 1994, Öborn 1994, Joukainen and Yli-Halla 2003)
Iron sulphides are usually divided into two categories: (1) acid volatile sulphide (AVS) and (2)
The samples were thawed in a nitrogen-filled glove bag and any visibly oxidized surface material was removed, keeping only the un-oxidized core of the sample for subsequent analysis
Summary
Significant areas along the boreal coastal plains of Finland and Sweden (Palko 1994, Öborn 1994, Joukainen and Yli-Halla 2003). AS soils constitute a major environmental problem due to the release of acidity and metals during oxi-. Acid sulphate (AS) soils occupy large areas of the tropical and subtropical coasts of Asia, Africa,. According to van Breemen (1973) potential AS soils commonly contain pyrite sulphur (FeS2) between 1 and. 4%, and ferrous monosulphides (FeS) comprise less than 0.01% and rarely exceed 0.6% even in reduced black muds. In black clays in north-eastern Sweden FeS comprises a significant amount (up to 80%) of the total sulphur Iron sulphides are usually divided into two categories: (1) acid volatile sulphide (AVS) and (2).
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