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A procedure to calculate the uncertainty associated to a binary response, of the type yes/no, originated from an instrumental screening system, is described. Useful equations have been developed based on statistical intervals, and their validation were performed with standard commercial solution. It was applied to a differential pulse anodic stripping voltammetry (DPASV) screening system to analyse tap water, specifically, for determining Pb 2+ and Cd 2+ above the UE legislation limits, 10 and 5 μg/l, respectively. A cut-off value from the responses of the calibration samples is calculated and compared with the responses obtained for unknown samples. From this comparison, we will be able to take a compliance yes/no decision, with an alpha probability of committing a type I error. Another parameter, r screening , is calculated in order to compare different methods for the same screening application. |
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