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What is Potential Acid Sulfate Soil (PASS?

April 26, 2017acid pass potential soil Sulfate

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What is Potential Acid Sulfate Soil (PASS?

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PASS is any material (e.g. soils/ rock) which contains pyritic material (e.g. Iron sulfide, FeS2) in an un-oxidised state, which may release excess acidity, sulfate and metals due to oxidisation by exposure to air (e.g. by excavation, or lowering of the water table).