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The quality of soil and water was investigated in an estuarine floodplain system, eastern Australia. The backswamp portion of the floodplain is underlain by sulfidic sediments at depths about 0.5-0.9m below the ground surface. Actual acid sulfate soils have developed due to sulfide oxidation as a consequence of land drainage since the early 1900s. These acid sulfate soils have a high measured total...