Download Aquatic effects of acidic deposition by Timothy J Sullivan PDF

By Timothy J Sullivan

ISBN-10: 1566704162

ISBN-13: 9781566704168

"While not a regular information merchandise, acidic deposition continues to be a common factor for environmental managers and coverage makers. Emissions of sulfur and nitrogen from strength vegetation, commercial amenities, and motorcars - significant reasons of acidic deposition - nonetheless pour into the ambience each day. Aquatic results of Acidic Deposition summarizes and synthesizes significant developments in medical research, Read more...

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Extra resources for Aquatic effects of acidic deposition

Sample text

The difference between calculated and measured ANCG values increases as organic-acid concentration, reflected by DOC, increases. The discrepancy between Gran titration ANC and calculated ANC caused by organic acid influence and/or differences in defining the proton references for Al have major implications for aquatic effects assessment activities. Gran ANC is used primarily for classification, evaluation of current status, monitoring of temporal trends, and calibration of paleolimnological transfer functions.

Designation of the charge, however, establishes the proton reference level (PRL). , 1985). These levels have different advantages; the former yields results that are closer to ANCG values; the latter eliminates the need to include Al in ANC calculations. , 1987; Driscoll and Newton, 1985) from 25 lake–watershed systems in the Adirondack Mountains of New York were used by Sullivan et al. (1989) to estimate the Al PRL. The speciation of Al was calculated using the chemical equilibrium model ALCHEMI (Schecher and Driscoll, 1994), and the equivalent charge on the Al species was determined.

3) where brackets indicate concentrations, units are in µM, and standard errors of the parameter estimates are given in parentheses. 05), considerably higher than that observed during fall. Aluminum has also been implicated as a causal factor in forest damage from acidic deposition. , 1992; Cronan and Grigal, 1995). Specifically, a reduction in the Ca/Al ratio in soil solution has been proposed as an indicator reflecting Al toxicity and nutrient imbalances in sensitive tree species. This topic was reviewed in detail by Cronan and Grigal (1995), who concluded that the Ca/Al molar ratio provides a valuable measurement endpoint for identification of approximate thresholds beyond which the risk of forest damage from Al stress and nutrient imbalances increases.

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