The reaction of copper ions and hypochlorite with minesite soils in relation to fungicidal activity [Western Australia]
1992
Gerritse, R.G. | Adeney, J.A. (Commonwealth Scientific and Industrial Research Organisation, Wembley (Australia). Div. of Water Resources) | Baird, G. | Colquhoun, I. (Alcoa of Australia Ltd, Applecross. Environmental Dept.)
For 6 regolith types sampled from a lateritic profile at the Huntly minesite of Alcoa on the Darling Plateau in Western Australia, a Cu2+ concentration greater than 50 mg per L (considered fungicidally effective against Phytophthora cinnamomi) was reached at additions of about 0.5 g of Cu2+ per kg. For 2 soil samples from mineral sand areas on the Swan Coastal Plain, addition of 0.1-0.2 g Cu2+ per kg was sufficient. Leaching of Cu2+ is slow, so that a single treatment of regolith material would remain effective for 2-10 years. Sandy soils would have to be treated once a year. Hypochlorite is rapidly reduced to chloride by organic matter in soils. At additions of about 0.5 g Cl0- per gram of organic C, however, hypochlorite can be an effective fungicide against P. cinnamomi.
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