Abstract

Deficiency, excess or imbalance of trace elements have been attributed to some human diseases for some time. Maps showing the regional distribution of trace elements are often useful in defining possible problem areas, particularly in several parts of the world in less developed countries where foodstuffs are locally grown. National geochemical atlasses of geochemistry — health connection based on stream sediment and soil surveys are supporting research in that respect. The advantages and limitations of such surveys to human health studies are reviewed. Many of the relations established between the abundance of chemical elements in the environment and human disease are empirical rather than causal.

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