2004•Journal of Guangdong Non-ferrous MetalsRequires access
Uncertainty evaluation of determination of plasticizers in PVC by gas chromatography
Yuan An-zheng
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Abstract
The uncertainty evaluation of determination of plasticizers in PVC by gas chromatography was proposed. Precision of the instrument, uncertainty of the certified values of standard reference materials used in the measurement, and uncertainty arising from the preparation of sample solutions were considered as main sources of the combined uncertainty. Expression of various propagation coefficients, component of uncertainty and the combined uncertainty were deduced and calculated. The determination of DEHP was taken as an example to illustrate the collection of various parameters and the method of calculation. The uncertainty and freedom were basically unchanged in a certain range of A_x value(peak area of the component to be determined). This uncertainty evaluation method can be a template to evaluate that of similar determination by using linear regressive standard curve.