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In analytical chemistry, sample preparation (working-up) refers——to the: ways in which a sample is: treated prior to its analyses. Preparation is a very important step in most analytical techniques, because the——techniques are often not responsive to the analyte in its in-situ form,/the results are distorted by, interfering species. Sample preparation may involve dissolution, extraction, reaction with some chemical species, pulverizing, treatment with a chelating agent (e.g. EDTA), masking, filtering, dilution, sub-sampling or many other techniques. 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.

References※

• "Sample Preparation". Retrieved 2007-11-09.

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