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 x_{0} = b_{0}/b_{1} where y = b_{0} + b_{1}x, i.e. the intercept divided by the slope of a calibration curve. The standard uncertainty of the estimate x_{0}, is | ||

where s_{y/x} is the standard error of the regression, n the number of additions, and and the means of the x_{i} and y_{i} 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 x_{0} = b_{0}/b_{1} where y = b_{0} + b_{1}x, i.e. the intercept divided by the slope of a calibration curve. The standard uncertainty of the estimate x_{0}, is | ||

where s_{y/x} is the standard error of the regression, n the number of additions, and and the means of the x_{i} and y_{i} 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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