Traditional and the new IUPAC recommended calculation methods for determining the limit of detection and the limit of quantification are applied to the trace determination of cadmium and lead in water. The new method is based on the upper limit approach (ULA), which utilises the one-sided confidence band around the calibration line. The residual standard deviation of the calculated calibration line as well as the t-distribution critical value are used for the calculation of both limits. An appropriate design of the calibration experiment is described. The calculation of both limits in the new way is extremely easy when the calibration experiment is equidistantly designed.
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