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Sample Pre-Treatment And The Determination Of Some Chemical Properties Of Acid Sulfate Soil Materials, Crystal Maher, Leigh Sullivan, Nicholas Ward
Sample Pre-Treatment And The Determination Of Some Chemical Properties Of Acid Sulfate Soil Materials, Crystal Maher, Leigh Sullivan, Nicholas Ward
Dr Nicholas J Ward
This study provides a systematic analysis of the effect of common acid sulfate soil (ASS) sample pre-treatments (namely freezing, oven drying, and grinding) on chromium-reducible sulfur (SCR) and water-soluble sulfate determinations. The results show that oven drying and hand grinding of the samples prior to analysis resulted in a decrease in SCR (i.e. up to 20% compared to those of frozen samples). This lower SCR value was partly due to the oxidation of sulfides in the oven. For oven-dried ASS materials, more intensive grinding in a ring mill increased SCR values, most likely by abrading coatings from pyrite grains. For …