An application of soil humic substances to geochemical exploration |
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| Institution: | 1. Department of Earth, Environment and Resources Sciences (DiSTAR), University of Napoli “Federico II”, Complesso Universitario di Monte Sant''Angelo, Via Cintia snc, 80125 Napoli, Italy;2. School of Animal, Rural and Environmental Sciences, Brackenhurst Campus Southwell NG25 0QF Nottingham Trent University, United Kingdom;3. Department of Science and Technology, University of Sannio, via dei Mulini 59/A, 82100 Benevento, Italy;4. Pegaso University, Piazza Trieste e Trento 48, 80132 Naples, Italy;5. Benecon Scarl, Dip. Ambiente e Territorio, Via S. Maria di Costantinopoli 104, 80138 Naples, Italy |
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| Abstract: | The wet temperate climate of Tasmania causes strong leaching of soils and conventional “B” horizon soil geochemistry yields unreliable results. For this reason, most surveys of recent times have been based on “C” horizon sampling which is expensive and often difficult to accomplish in the strongly dissected, heavily vegetated terrain of western Tasmania.A system has been developed based on sampling of the “A” soil horizon, extraction of the humic substances with 0.5 M NH4OH and determination of the associated metals by atomic absorption spectrometry. The humic substances content of the extract is obtained from quantitative wet oxidation of an aliquot of the sample with 0.4N K2 Cr2 O7.In trials to date this system has yielded results compatible with those obtained from the “C” horizon. It offers a cost effective method of exploration by soil geochemistry and can be carried out with minimal disturbance to the environment. |
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