Uncertainty Calculation for the Determination of Chromium Oxide in Leather
Abstract
This work describes the uncertainty calculation for the determination of chromium oxide in leather. Following the various steps for the calculation of uncertainty which includes assembling a list of sources of uncertainty, with the help of basic formula used to calculate the measure and as all parameters cause an influence on the result because of the uncertainty value associated with it then the basic cause and effect diagram is made which shows the correlation between these and indicates their effect on the uncertainty of the result.
All individual sources of uncertainty are evaluated by quantification. Mass, purity, and molecular mass of potassium dichromate are calculated against the volume of sodium thiosulphate following the first step in the test method is the standardization of sodium thiosulphate with the primary standard, potassium dichromate. So the overall uncertainty value depends on the uncertainties associated with the mass, purity, and molecular mass of potassium dichromate.
Keywords
Leather, chromium oxide, uncertainty, quality assurance, ISO/IEC 17025
Supporting Institution
Pakistan Council of Scientific and Industrial Research
Project Number
01
Thanks
Special thanks to the Pakistan Council of Scientific and Industrial Research, Leather Research Centre, Pakistan as this work has been carried out at its premises. The article complies with national and international research and publication ethics. Ethics committee permission was not required for the study. This article was presented in the II. International Architectural Sciences and Applications Symposium as an abstract paper. It was later expanded for this Journal.
References
- Determination of Chromium Oxide in Leather (2018). IULTCS/IUC 8:1. Northampton, UK: Society of Leather Technologists and Chemists (SLTC).
- Dewani, R., Ahmed, F., Saleemuddin, M., Rasheed, M., Pervez, M., & Mahboob, S. (2012). Quantifying Uncertainty for the determination of formaldehyde in leather by colorimetric method. Journal of the American Leather Chemists Association, 107 (11), 384-393.
- EURACHEM/CITAC Guide. (2012). Quantifying uncertainty in analytical measurement S. L. Ellison & A. Williams (Eds.), Retrieved from www.eurachem.org
- General requirements for the competence of testing and calibration laboratories. (2017) ISO/IEC 17025:2017 (pp. 30). Geneva, Switzerland: International Standard Organization and The International Electrotechnical Commission.
- Kadis, R. L. (1998). Evaluating uncertainty in analytical measurements: the pursuit of correctness. Accred Qual Assur, 147-151.
- Meyer, V. R. (2007). Measurement uncertainty. Journal of Chromatography A, 1158(1-2), 15-24.
- Rowley, A. (2001). Evaluating uncertainty for laboratories: A practical guide and handbook: Alan Rowley Associates.
- Vogel, A. I., Jeffery, G. H., Bassett, J. & Mendham, J. (1989). Vogel's textbook of quantitative chemical analysis (5th ed. Vol. 349): Longman Scientific & Technical London (pp. 392).
- Wieser, M. E., Holden, N., Coplen, T. B., Böhlke, J. K., Berglund, M., Brand, W. A. & . . . Meija, J. (2013). Atomic weights of the elements 2011 (IUPAC Technical Report). Pure and Applied Chemistry, 85(5), 1047-1078. Doi: http://dx.doi.org/10.1351/PAC-REP-13-03-02