List different methods for preparing sample for AAS and describe any one of them in details
Sample preparation can be performed by simple dilution, or with heating for pre-concentration or partial or total dissolution. However to achieve most sample preparations, it is necessary to add reagents to the sample and to apply enough energy to break some bonds and the crystalline structure of solids. If necessary, it is possible to use complementary reagents to obtain the analytes in solution. Two basic procedures are normally used for sample preparation: dry and wet decomposition.
Dry dissolution
Fusion and dry ashing. Dry decomposition by fluxes (fusion processes) is normally used for silicates, refractory materials, some mineral oxides and iron alloys. The sample is mixed with a flux and then fused to form products that can be dissolved in water or dilute acid. The temperature
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