What problems can exposed acid sulfate soils cause?
Carbonates and ‘sulfate reducing’ bacteria in the lake sediments can neutralise some of the acid produced by acid sulfate soils when exposed to air, but if too much is created the soil and water can become very acidic. This can impact on the environment, agriculture and livestock. The acid can also cause toxic metals such as manganese, aluminium and arsenic to be released. When the soils get wet again, through rainfall or increased river flow, the acid and metals can spread and affect large areas. If detected and managed appropriately, acid sulfate soils do not pose any major risk. However, if the soils are disturbed and left untreated they can become a serious problem. The main way to prevent acidification is to ensure acid sulfate soils are kept wet and not exposed to air.
