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An evaluation of whole-order, 1/ 2 order, and 1/ 3 order reporting in semiquantitative spectrochemical analysis

An evaluation of whole-order, 1/ 2 order, and 1/ 3 order reporting in semiquantitative spectrochemical analysis


The results of 507 spectrochemical determinations in 63 samples are evaluated by the percentage of successful assignments to the correct range and by calculation of the logarithmic standard deviation. The intervals in terms of the standard deviation are approximately the same whether computed by the percentage of hits or by the usual method for replicate determinations (after converting the data to logarithms). The size of the reporting interval is from 4 to 6 times the standard deviation for the whole order, 2.7 times the standard deviation for the 1/2-order, and still approximately twice the standard deviation for the 1/3-order of magnitude breakdown.

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