作者: Reijo Salminen
DOI: 10.1016/B978-0-444-53159-9.00001-2
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摘要: Abstract Regional geochemical surveys are used to locate large provinces, i.e., describe large-scale variation of element concentrations, while local-scale and detailed studies aimed at revealing ore suboutcrops or point sources contamination. The information obtained from regional-scale is also important as background for environmental legislation describing the natural geological level concentrations. Thus often multipurpose/multidisciplinary that include several different sample materials such soils, sediments, water biota collected one time purposes. sampling network can be based on drainage basins more less regular grids. Sample density varies per square kilometer thousands kilometers.