Watersheds losses

FIGURE 2.8 Inputs and losses of a) THg and b) MeHg for watersheds in Europe and North America. 

The specific activation conditions required for an individual catalyst likely depend on the metal and support, but 300°C appears to be somewhat of a watershed temperature. Activation at temperatures above 300°C generally coincides with loss of Pt metal surface area due to sintering. The metal loading, dendrimer loading, and metahdendrimer ratios also impact activation conditions, suggesting that it may be necessary to optimize activation conditions for individual catalysts. Using temperatures at or near 300°C, supported pt,45,53,58,6i 45 pt Au, Pt-Cu,. and Ru ... 

Caro, J.H., Freeman, H.P., and Turner, B.C. Persistence in soil and losses in runoff in soil-incorporated carbaryl in a small watershed, J. Agrlc. Food Chem., 22(5) 860-863, 1974. 

Braun HE, Frank R. 1980. Organochlorine and organophosphorus insecticides their use in eleven agricultural watersheds and their loss to stream waters in southern Ontario, Canada, 1975-1977. Science of the Total Environment 15 169-192. 

Eutrophication. Thus far N has been discussed in terms of its prominence as an acidic anion (i.e., as N03 ). As in terrestrial ecosystems, inorganic forms of N also act as nutrients in aquatic systems, and a possible consequence of chronic N loss from watersheds is the fertilization of lakes and streams. Establishing a link between N deposition and the eutrophication of aquatic systems depends on a determination that the productivity of the system is limited by N availability and that N deposition is a major source of N to the system. In many cases the supply of N from deposition is minor when compared to other anthropogenic sources, such as pollution from either point or nonpoint sources. 

Regional Analysis of the Stages of Watershed Nitrogen Loss... 

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