Evaluation of Uncertainty in Analysis of Nitrite in Water by High Performance Liquid Chromatography

Le résumé fourni par la source

This paper establishes a mathematical model of assessing the various factors of the uncertainty in analysis of nitrite in water by HPLC-DAD, investigates all the steps of the measurement by HPLC and calculates the various factors of evaluating the uncertainty analysis. The result shows: in this method the nitrite content in certain domestic sewage is measured 1.161 mg·L-1, and the uncertainty from the standard material and the test standard deviation under the repeatable conditions contribute mainly to the uncertainty of measuring the nitrite content in water. The uncertainty from the standard material generally includes the uncertainties from standard dilution, standard product purity and the environment temprature, in which the extraction, dilution and stability of the standard solution are the main contributors to the uncertainty from standard dilution. After calculation the relative uncertainty synthesis of nitrite content in water uncertainty is 0.0050, when the confidence probability P=95% and the expanded uncertainty 0.012mg·L-1. Without regard to the inhomogeneity of the nitrite distribution in water sample, the content of nitrite in water sample can be presented as (1.161±0.012) mg·L-1.

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