Assuring Comparability Of Results Of
Nitrate Determinations In Wastewater:
Application Of Metrological Principles
Author(s)
A. Drolc & M. Roš
Abstract
In the present paper, a methodology for the establishment of traceability and
evaluation of measurement uncertainty of results of nitrate ion determination in
wastewater is presented. Nitrate ion was determined using ion chromatography
(EN ISO 10304-2, 1996). The necessary relevant information was obtained from
the method validation data, the quality control data and equipment calibration
certificates. The method of measurement is described together with the
measurement equation, selected traceable reference standards and the associated
measurement uncertainty. The major sources of uncertainty of the results of
measurement were identified and the combined uncertainty was calculated.
Identification of the main uncertainty sources represent a basis for target
operation for reducing the measurement uncertainty of this determination.
Keywords: nitrate, metrology in chemistry, traceability, comparability,
measurement uncertainty.
1 Introduction
Every year many millions of chemical measurements are made in the EU. It has
been estimated that in the industrialised countries measurements and related
operations account 4 to 6 % of the gross national product. Measurements are
made for important purposes, like the determination of quality of products,
estimation of the state of the environment, implementation of environmental
regulations etc. That makes these measurements extremely important. But sadly,
all too often chemical measurement results are unreliable. The impact of these
poor quality measurements on the economic and social live of the EU is
enormous. As a consequence, both government and industry are increasingly
Keywords
nitrate, metrology in chemistry, traceability, comparability,
measurement uncertainty.
Related Book
Other papers in this volume
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