Geochemical data statistical distribution

The distribution of geochemical data may be presented, in their most basic form, through the use of dot maps in which dots, or other symbols selected by the operator, of a size proportional to concentration are plotted at geographical coordinates for each sampled site. Dot sizes may be classified by means of concentration intervals based on percentiles or other statistical methods. Dot maps are often the most suitable method to represent isolated points of a discrete set of geochemical data. 

Data analysis, using elementary statistics and Kriging techniques [23] in the construction of the geochemical maps enables an understanding of the heavy metal distribution and the origin of the regional pollution. 

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