Abstract
THE role of organic acids in surface-water acidification is a matter of recent controversy1–8. It has been suggested1,4–6 that lakes and streams in the northeastern United States and southern Scandinavia that have high mineral acidity resulting from acid deposition had, before acid deposition, high concentrations of dissolved organic carbon (DOC) and were acidified by natural organic acids. The suggestion is that deposition of strong mineral acids has been buffered by concurrent losses in organic acids and DOC4–6, resulting in little or no overall change in pH. Despite considerable debate6–8 and comparative analyses of lake chemistry2,7, this hypothesis has never been tested experimentally in the field. Here we present results from an experimental acidification of a brown-water stream that tests two of the major elements of the hypothesis. We find that DOC concentrations are not reduced by acidification, and that the organic acid–base system has only a very limited capacity to buffer inputs of strong mineral acids. In addition, mineral acids mobilize toxic forms of aluminium.
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Krug, E. C. & Frink, C. R. Science 221, 520–525 (1983).
Gorham, E. et al. Nature 324, 451–453 (1986).
Brakke, D. F., Henriksen, A. & Norton, S. A. Nature 329, 432–434 (1987).
Krug, E. C. Assessment of the Theory and Hypotheses of the Acidification of Watersheds, Rep. 457 (Illinois State Water Survey Division, Champaign, 1989).
Davis, R. B., Anderson, D. S. & Berge, F. Nature 316, 436–438 (1985).
Krug, E. C. Nature 334, 571 (1988).
Brakke, D. F., Henriksen, A. & Norton, S. A. Nature 335, 305 (1988).
Johnson, N. M. et al. Science 225, 1424–1425 (1984).
McDowell, W. H. thesis, Cornell Univ. (1982).
Hall, R. J. et al. Limnol. Oceanogr. 30, 212–220 (1985).
Henriksen, A. et al. Water Res. 22, 1069–1073 (1988).
Norton, S. A. et al. in Acidification and Water Pathways Vol. 1, 249–258 (Norwegian Natn. Comm. Hydrology, Oslo, 1987).
Perdue, E. M., Reuter, J. H. & Parrish, R. S. Geochim. cosmochim. Acta. 48, 1257–1263 (1984).
Kramer, J. R. & Davies, S. S. Envir. Sci. Technol. 22, 182–185 (1988).
Likens, G. E. et al. Tellus (in the press).
Semb, A. & Dovland, H. Wat. Air & Soil Pollut. 30, 5–16 (1986).
Driscoll, C. T. Int. J. Envir. Analyt. Chem. 16, 267–284 (1984).
Schecher, W. D. & Driscoll, C. T. Wat Resour. Res. 23, 525–534 (1987).
Driscoll, C. T., Fuller, R. D. & Schecher, W. D. Wat. Air & Soil Pollut. 43, 21–40 (1989).
Krug, E. C. & Isaacson, P. J. Soil Sci. 137, 370–378 (1984).
McColl, J. G. & Pohlman, A. A. Wat. Air & Soil. Pollut. 31, 917–927 (1986).
Fuller, R. D., Simone D. M. & Driscoll, C. T. Wat. Air & Soil Pollut. 40, 185–195 (1988).
Likens, G. E. et al. Ecol. Monogr. 40, 23–47 (1970).
Lawrence, G. B., Fuller R. D. & Driscoll, C. T. J. Envir. Qual. 16, 383–390 (1987).
Fuller, R. D. et al. Nature 325, 707–710 (1987).
McDowell, W. H., Cole, J. J. & Driscoll, C. T. Can. J. Fish. aquat. Sci. 44, 214–218 (1987).
McAvoy, D. C. et al. J. Soil Sci. Am. (in the press).
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Hedin, L., Likens, G., Postek, K. et al. A field experiment to test whether organic acids buffer acid deposition. Nature 345, 798–800 (1990). https://doi.org/10.1038/345798a0
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DOI: https://doi.org/10.1038/345798a0
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