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Treatment is done to prepare the sample into a form ready for analysis by specified analytical equipment. Sample preparation could involve: crushing and dissolution, chemical digestion with acid or alkali, sample extraction, sample clean up and sample pre-concentration.
Atomic absorption spectroscopy instruments place a sample in a high temperature flame that yields atomic species and passes selected, element specific, illumination through the flame to detect what wavelengths of light the sample atoms absorb. Either acetylene or nitrous oxide fuels the analytical flame.
A typical sample preparation procedure for solid and viscous liquid samples involves digestion with a concentrated acid; for example, HNO3, HCl, or H2SO4. After dilution of the digested solutions, samples can be directly injected into flame AAS as well as graphite furnace AAS.
The objective of sample dissolution is to mix a solid or nonaqueous liquid sample quantitatively with water or mineral acids to produce a homogeneous aqueous solution, so that subsequent separation and analyses may be performed.
Digestion dissolves the sample into a liquid phase, which is required for most instruments. The digestion technique used depends on the end use of the data. Fusion involves the total digestion of the sample in molten flux, then casting the melts into discs.