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5. Mineralization: decomposition of organic matter
Given that most environmental samples contain highly variable proportions of organic matter, it is clear that dissolution of the samples usually analyzed cannot be achieved in a single step using a single reagent. In practice, the number of steps and reagents required is dictated by the composition of the sample. Purely organic samples will generally be mineralized by oxidation followed by digestion of the resulting residue. This same digestion may, however, ensure the dissolution of any initially mineral part of the sample. In most modern processes, only strong acids and hydrogen peroxide are used, in variable proportions and mixtures, for mineralization and dissolution.
5.1 Dry ashing
Mineralization of the organic material is achieved by calcination in an...
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Mineralization: decomposition of organic matter
Direct analysis of solid samples
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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