A geochemical study of the forms of metals present in sediments from Spencer Gulf,South Australia |
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| Affiliation: | 1. Institute of Physical, Chemical, and Biological Problems of Soil Science, Russian Academy of Sciences, Pushchino, Russia;2. Institute of Agrophysics, Polish Academy of Science, Lublin, Poland;1. Departamento de Solos, Universidade Federal do Rio Grande do Sul (UFRGS), 91540-000, Porto Alegre, RS (Brazil);2. Instituto Federal do Rio Grande do Sul/Campus Ibirubá, Ibirubá (Brazil);1. Pegasus Technical Services, Inc., 46 E. Hollister St., Cincinnati, OH 45219, United States;2. U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 26 W. Martin Luther King Dr., Cincinnati, OH 45268, United States |
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| Abstract: | Metal contaminated sediments and live shells from near-shore sites and from tidal flats adjacent to the lead-zinc smelter at Port Pirie were collected for study. Some samples were separated into size fractions and density sub-fraction and the density separates examined with the electron microprobe for Zn, Pb, Cd, S, Mg, Ca, Fe, Si, Al and other elements. Some samples were examined whole. Correlations between the elements, and particularly between Zn, Pb and sulphide sulphur (as distinct from sulphate sulphur) were tested. It was found, for example, that very fine precipitated ZnS was present at contaminated sites in Spencer Gulf, where it occurred in clay-carbonate aggregates, in the magnesian calcite of shell fragments, and in fragments of decaying seagrass. On the other hand, Zn and Pb sulphides were rarely found in the tidal flats, where the metals were associated with fine-grained dolomite in the sediment. |
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