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Availability.
While not one of the analyses normally performed by analytical chemists, determination of the availability of a chemical species is often necessary. To exert a meaningful environmental effect, a pollutant species must almost always enter solution. For instance, toxic compounds associated with airborne particles must be dissolved by lung fluids before either a local or systemic effect can be produced.  Thus, laboratory-scale simulation of the availability characteristics of a chemical species can provide a necessary link between its presence and its eventual impact.
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