1.150 measurement procedure with standard addition standard addition Measurement procedure in which indications are obtained for an analytical sample as well as for analytical samples with serial addition(s) of aliquots of a measurement standard. Note 1: A measurement procedure with standard addition provides an unbiased measurement result if there is a multiplicative matrix effect. Note 2: If the relation between the indications (y) and the quantities added (x) is obtained by linear regression of y on x, then the quantity in the analytical sample is x0 = b0/b1 where y = b0 + b1x, i.e. the intercept divided by the slope of a calibration curve. The standard uncertainty of the estimate x0, is where sy/x is the standard error of the regression, n the number of additions, and and the means of the xi and yi respectively. (See ref. 62 p. 8 and p. 157). See also: ref. 9. Source: ref. 2 entry 3.50 with added Note 2.
 1.150 measurement procedure with standard addition standard addition Measurement procedure in which indications are obtained for an analytical sample as well as for analytical samples with serial addition(s) of aliquots of a measurement standard. Note 1: A measurement procedure with standard addition provides an unbiased measurement result if there is a multiplicative matrix effect. Note 2: If the relation between the indications (y) and the quantities added (x) is obtained by linear regression of y on x, then the quantity in the analytical sample is x0 = b0/b1 where y = b0 + b1x, i.e. the intercept divided by the slope of a calibration curve. The standard uncertainty of the estimate x0, is where sy/x is the standard error of the regression, n the number of additions, and and the means of the xi and yi respectively. (See ref. 62 p. 8 and p. 157). See also: ref. 9. Source: ref. 2 entry 3.50 with added Note 2.

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