Stručni rad
TOTAL ACIDITY DETERMINATION IN AVIATION TURBINE JET FUEL: MEASUREMENT UNCERTAINTY ESTIMATION
Dunja Šeremešić
Dragica Grubić
Sažetak
Abstract
The paper describes the procedure of measuring uncertainty evaluation in the results of total acidity in fuel samples for aviation turbine engines. An analysis has been performed of uncertainty sources contributing to total acidity determination by titration method.
Reliable and comparable measurement data are important for making decisions on fuel quality. Measurement results are incomplete without an evaluation of their uncertainty, which is a quantitative indicator of the results’ reliability.
Uncertainty evaluation may be confusing, because there is no uniform procedure for its elaboration. Testing laboratories may use the concept of measurement uncertainty as an addition to the traditional approach to statistical control of the measurement procedure.
Through a systematic following of references, seminars and mutual discussions, we have made considerable efforts towards understanding the problem itself, as well as the application of the very procedure of evaluation. We have elaborated the standard method for which we have validation data and interlaboratory comparison data (ASTM-Interlaboratory Crosschecking Program). While evaluating the measurement uncertainty of results during the determination of total aciditiy in aviation turbine fuel, we have been guided by recommendations of EURACHEM/CITAC Guide: »Quantifying Uncertainty in Analytical Measurement».
The paper would like to show that the data on measurement uncertainty represent yet another way of statistical testing control, which - in combination with the measures of precision (repeatability and reproducibility) - deals with the accuracy of chemical analysis and improves the quality control system in laboratories.
Ključne riječi
determination of measuring uncertainity; standardization of measuring; jet fuel; acidity in aviation turbine fuel
Hrčak ID:
7381
URI
Datum izdavanja:
30.6.2003.
Posjeta: 3.027 *