Abstract
Three different stages of the analytical chain will be discussed. Firstly, the merits and demerits of the traditional dry ashing, a well established technique that is sometimes viewed with unwarranted sceptisism. Secondly, control of ashing temperature, background correction systems and autosampler volumes in AAS-determinations will be discussed. Thirdly, the role of intercalibrations and the use of reference materials will be discussed in terms of their limitations in providing information on analytical performance. Two ways to obtain more complete information on a laboratory's performance will be described.
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