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2. Definition of analyzed media
Samples to be analyzed in the environmental and health fields may be in liquid or solid form. Liquids are either aqueous (water, beverages, urine, blood, milk, etc.) or in some other form (oils, etc.). Solid samples may contain a majority of organic matter (plant and animal tissues) or inorganic matter (soils, sediments...). Each of these cases requires a different analytical approach, selected on the basis of the sample's composition in terms of both majority and minority constituents, especially if it is the latter that are the subject of the analysis.
To simplify the problem, we can consider that the organic part of the sample is decomposed and eliminated during the preparation stages. The residue analyzed therefore contains only mineral compounds in highly variable concentrations. These include major elements (the matrix) present at concentrations of over 0.1%...
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Definition of analyzed media
Sources of error
Bibliography
References
Website
American site devoted entirely to sample preparation (Duquesne University)
Standardization
Unlike the Environmental Protection Agency (EPA) in the United States, French standardization (AFNOR) was only very late in taking an interest in the preparation of environmental samples. This is probably due to the excessive diversity of samples and the division of standardization committees. However, some of them, such as metallurgy, fertilizers and fertilizer materials, drew up standards as early as 1965 to 1975. In...
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