Kounbach Said, Laassiri Said, Moutaoukil Zakaria, Benzaouia Abderrahim, Benhida Rachid
Department of Chemical and Biochemical Sciences, Green Process Engineering CBS, Mohammed VI Polytechnic University, 43150, Ben Guerir, Morocco.
Institut de Chimie de Nice, UMR7272, Université Côte d'Azur, 06108, Nice, France.
Anal Sci. 2023 Nov;39(11):1865-1873. doi: 10.1007/s44211-023-00391-9. Epub 2023 Jul 7.
The role of metrology in the industrial and manufacturing sectors is of paramount importance to ensure informed decision-making whether for product quality control, process monitoring and R&D activities. However, to guarantee the quality and reliability of analytical measurements, the development and use of appropriate reference materials (CRMs) is essential. In particular, certified reference materials (CRMs) are extensively used to validate analytical methods in a multitude of applications, measure uncertainty, improve the accuracy of measurement data, as well as to establish the meteorological traceability of analytical results. In this paper, we report the improvement of the characterization uncertainty of an in-house matrix reference material by direct determination of the concentration of fluorosilicic acid recovered from the fertilizers production industry. The certified reference material was characterized by the potentiometric method as a novel and direct approach for the determination of HSiF concentration and the results were compared against a reference measurement procedure based on molecular absorption spectrophotometry (UV-VIS). The approach adopted in the work resulted in the improvement of the uncertainty of the CRM by decreasing the characterization uncertainty, which constitutes the major contribution to the overall uncertainty. The newly obtained characterization combined standard uncertainty was 2.0 g.kg, which gives an expanded uncertainty (k = 2 with a confidence interval of 95%) of the CRM of 6.3 g.kg instead of 11.7 g.kg reported in previous works. This improved CRM can be used to improve the uncertainty of the analytical methods used for the determination of HSiF mass fraction and, therefore, to improve the accuracy of measurement data.
计量在工业和制造业中的作用对于确保在产品质量控制、过程监测和研发活动中做出明智决策至关重要。然而，为保证分析测量的质量和可靠性，开发和使用合适的参考物质（CRM）至关重要。特别是，有证参考物质（CRM）被广泛用于验证众多应用中的分析方法、测量不确定度、提高测量数据的准确性以及建立分析结果的计量溯源性。在本文中，我们报告了通过直接测定从化肥生产行业回收的氟硅酸浓度来改进自制基体参考物质的特性化不确定度。该有证参考物质采用电位滴定法进行特性化，这是一种测定氟硅酸浓度的新颖直接方法，并将结果与基于分子吸收分光光度法（紫外 - 可见）的参考测量程序进行比较。该工作中采用的方法通过降低特性化不确定度提高了CRM的不确定度，特性化不确定度是总体不确定度的主要贡献因素。新获得的特性化合成标准不确定度为2.0 g·kg，这使得CRM的扩展不确定度（k = 2，置信区间95%）为6.3 g·kg，而不是先前工作中报告的11.7 g·kg。这种改进后的CRM可用于提高用于测定氟硅酸质量分数的分析方法的不确定度，从而提高测量数据的准确性。
