Uncertainty of nickel chemical analysis in paired samples of lateritic ore, NiS and NiO by linear regression
Abstract
Interlaboratory comparison is an instrument for evaluating the laboratory performance in specific tests. In this work, the uncertainty in the quantitative
chemical analysis of the nickel concentration was determined in paired solid samples of the materials: lateritic ore (LO), nickel sulfide (NiS) and sintered
nickel oxide (NiO), using the simple linear regression. The analytical determinations were made by Atomic Absorption Spectrometry (AAS) with the
participation of three laboratories of the corporative group for the production of nickel in Cuba. The assumptions of the linear regression model were verified
using the Durbin-Watson statistic, homoscedasticity and normality test. The uncertainty in the slope (Sm), the uncertainty in the intercept (Sb) and the
standard deviation of the measurement (Sy) were determined. As a result, the expected value (x) of the nickel concentration presented a maximum error according to: LO: 0,06 %, NiS: 0.51 % y NiO: 0,33 % at the extreme ends of the measurement range. This method provides information to evaluate the
laboratories continuous performance, and in turn the historical database of interlaboratory comparison is analyzed.
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