COMPARISON OF DIFFERENT APPROACHES TO EVALUATE THE UNCERTAINTY OF GAS CHROMATOGRAPHY FOR NATURAL GAS.

COMPARISON OF DIFFERENT APPROACHES TO EVALUATE THE UNCERTAINTY OF GAS CHROMATOGRAPHY FOR NATURAL GAS. The evaluation of uncertainty associated with an analytic result is an essential part of the measurement process. Recently, several approaches to evaluate the uncertainty in Measurement have been developed. Here. the as chromatography assay uncertainty for natural gas is compared by some of these approaches: the guide to the expression of uncertainty in measurement (GUM) approach, top-down approach (reproducibility estimate from an in inter-laboratory study), Barwick & Ellison (data from validation), study of variability and fuzzy approach. The comparison shows that GUM. Barwick & Ellison and fuzzy approaches lead to comparable uncertainty evaluations, which does not happen with the top-down approach and study of variability by the absence of data normality.