Uncertainty analysis of determination of flumorph in fruit by dispersive solid phase extraction and HPLC
The uncertainty of measurement for flumorph residue in a sample by dispersive solid phase extraction and HPLC was evaluated. The mathematical model of measurement was set up. The different parts of uncertainty were analyzed, and the combined standard uncertainty and the expanded uncertainty of measurement results were calculated. The results showed that the main sources of uncertainties were the preparation of standard solutions, the fitted linear regression equation for the calibration curve, the uniformity of the samples and the consistency of sample pretreatment process. When the confidence probability was 95%, the expanded uncertainty in this analysis is 0.18 mg/kg with flumorph residue 1.46 mg/kg. So the flumorph residue in test sample can be expressed as (1.46±0.18) mg/kg (k=2).