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By Timothy J Sullivan

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

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This N saturation can lead to base cation depletion, soil acidification, and leaching of NO3- from soils to surface waters. Aber et al. (1989) provided a conceptual model of the changes that occur within the terrestrial system under increasing loads of atmospheric N. Stoddard (1994) described the aquatic equivalents of the stages identified by Aber et al. (1989), Background and Approach 13 and outlined key characteristics of those stages as they influence seasonal and long-term aquatic N dynamics.

For drainage lakes in the Adirondack Mountains of New York, an area that has experienced considerable surface water acidification, the concentration of Ali is highly correlated with H+, as would be expected from solubility constraints. , 1991), the relationship between Ali and H+ appears to vary seasonally, and Ali is higher at a given H+ concentration in the spring 18 Aquatic Effects of Acidic Deposition than it is during the fall. , related to spring snowmelt) and contact time of solution in the various soil horizons.

Several problems are associated with the interpretation of historical surface water chemistry data. , 1986). Prior to 1950, alkalinity and pH measurements were generally made colorimetrically with indicator dyes. ) was often the indicator for measuring alkalinity. It changes color across a pH range and historical records are unclear regarding the exact end point used for particular studies. , 1989a). Additional difficulties in interpretation include a general lack of QA/QC data in most cases, potential climatological differences, land use changes, and statistical uncertainties associated with natural variability of lakes and streams.

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