Good laboratory practice in initial sample preparation

5 Good laboratory practice in initial sample preparation 

At present there is no universally accepted Standard Method for Preparation of Samples from Contaminated Sites and few laboratories operate strictly comparable sample preparation methods. So it is important that the methods used for initial sample preparation are verifiably/// for their analytical purpose and applied by trained staff under an appropriate level of quality control. The design of sample preparation methods is generally constrained by the need to produce powders or finished samples with uniform physical characteristics by the most rapid method, whilst preventing the loss or alteration of any part of the sample by contamination, cross-contamination or chemical reaction. 

A clear definition of the analytical requirements is the first consideration. In most cases, the preparation method will be dictated by the tests and analyses 

Regardless of their purpose, well designed sample preparation methods have common distinguishing features. 

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