Acidic precipitation in southeastern Arizona: Sulfate,nitrate and trace-metal deposition |
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Institution: | 1. Department of Agronomy, University of Cordoba, Spain;2. Department of Rural Engineering, University of Cordoba, Spain;3. Department of Applied Physics, University of Cordoba, Spain;4. Institute for Sustainable Agriculture, (IAS), CSIC, Spain |
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Abstract: | Precipitation was collected during 1984 and 1985 at two sites in southeastern Arizona within 100 km of two copper smelters. The precipitation-depth-weighted mean pH was 4.63 and wet sulfate deposition was 8.9 kg ha−1 over a 13-month period. High acidity and sulfate concentration occurred when upper-level winds were from the directions of the smelters. A smelter ‘fingerprint’, based on antimony, arsenic, cadmium, copper, lead and zinc, was identified, and used to evaluate the smelter contribution to precipitation sulfate on an annually-averaged basis. The variations in the relative proportions of these trace metals were too large to permit application of the method to individual precipitation events. |
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