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1. Introduction
Pages 1-3

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From page 1...
... whose rates of deposition have probably increased, but data are lacking to prove it. The shift from natural control to anthropogenic control of atmospheric metal deposition represents a significant perturbation of biogeochemical cycles of these potentially toxic substances.
From page 2...
... At the end of the chapter the data are summarized in condensed tabular presentations, to describe the state of knowledge for each metal. Detailed tabular summaries containing references, and indicating whether the answers to the questions are known, partially known, or unknown, can be found in the Appendix.
From page 3...
... Does the metal have biological effects on the benthic system? FIGURE 1.1 Framework of relevant questions pertaining to trace metals .


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