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J. A. Reade and W. I. Stephen, Talanta, 15, 373 (1968). R. Belcher, J. R. Majer, R. Perry and W. I. Stephen, Anal. Chim. Acta, 45, 305 (1969). R. Belcher, J. R. Majer, R. Perry and W. I. Stephen, Anal. Chim. Acta, 43, 451 (1968). M. G. Allcock, R. Belcher, J. R. Majer and R. Perry, Anal. , 42, 776 (1970). J. R. Majer and M. J. A. Reade, Chem. , 58 (1970). 27 SUR L'ANALYSE DES REACTIONS EN MILIEU NON-AQUEUX AU MOYEN DES METHODES ELECTROCHIMIQUES G. L, 10 rue Vauquelin, Paris, 5 e , France RESUME Les méthodes électrochimiques sont appliquées à l'analyse des propriétés chimiques et électrochimiques dans les divers melanges eau-acide sulfurique.

The use of the term "(analytical) noise" in chemical analysis should not mislead one into supposing, by analogy, that the main source of fluctuations is to be found in the electronic part of the apparatus. Other sources of fluctuations often affect the blank measure (and the signal) more seriously; the electronic 'noise', even if perceptible, may be of no importance. The chemical, physical and environmental random perturbations listed above, and many others, vary so widely in appearance, temporal distribution and frequency that it is certainly hard to subsume all this under "(analytical) noise", a term which always evokes its original sensuous meaning.

This is a familiar procedure. In the region of high concentrations the blank portion of the measure may often be negligible. However, for trace determina­ tions the two portions contained in the total measure must be properly separated or at least taken into account, otherwise the analytical results derived from the measured values will be systematically wrong. In particular near the limit of detection the blank portion of the total measure may be much greater than the analytical signal. The difference—total measure minus blank measure—may be called "net measure".

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