Abstract
In order to obtain increasingly accurate activity measurements it is necessary to analyse all the parameters likely to affect this accuracy. Microweighing is, at present, a substantial source of error, since the precision of microbalances is sometimes well below the specifications published by the constructors. The non-linearity of the optical scale, the error on its calibration and the variation of this calibration with the sensitivity adjustment lead to errors of 5–10 μg. The various combinations of weights lead to errors very often greater than 20 μg and sometimes reaching 100–200 μg. These different factors result in appreciable errors in the determination of the mass of a microdrop. The best solution is obviously to convert these errors to corrections, but for this a set of high-quality reference weights and the means to conserve them would be necessary. Various methods are proposed to minimise the errors in weighings with type M-5 mechanical microbalances. A prospective study on the results to be expected from electrobalances is also undertaken.
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