Sampling and Preparation of RMs for Analysis

An important point for achieving results that can be compared to the certified values is the use of the appropriate sample size. The required amount is usually specified by the producer. However, some users take either a smaller amount (sometimes much smaller as required by the analytical technique see Sections 4.3 and 4.4), and many may even take larger amounts. These users must be aware of two problems  

Correct determination of the sample mass is critical. Usually drying conditions are specified by the producer. The user has to be aware that there is an amazing variety of recommended drying conditions presented in the various certificates. Since the optimum conditions are very dependent on matrix and composition, it is of utmost 

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