使用Baucke池支持pH测量质量的缓冲溶液参考材料的认证

IF 1.8 Q3 CHEMISTRY, ANALYTICAL Journal of Chemical Metrology Pub Date : 2023-05-19 DOI:10.25135/rnp.87.2303.2773
A. Shehata, A. R. Alaskar, Rashed A. Aldosari, F. Almutairi
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引用次数: 0

摘要

:对经认证的pH参考材料的需求非常强烈,以支持每日大量pH测量的可追溯性声明和质量。在这项工作中,制备了三批缓冲溶液,并根据2002年IUPAC建议对其pH值进行了认证。第一批由四草酸钾(二水合物)和草酸二钠制备,以提供pH4,第二批由磷酸氢二钠和磷酸二氢钾制备,提供pH7。第三批由碳酸氢钠和碳酸钠制备,以提供pH10。通过机械振荡将每批均化一晚,并装瓶到50个HDPE瓶中,每个瓶为250mL。系统地选择了多个瓶用于缓冲参考材料的均匀性、稳定性和表征研究。这些研究是根据ISO 17034和ISO指南35的要求使用Baucke细胞进行的。二级缓冲液的pH值4、7和10相对于斯洛伐克国家计量研究所(SMU)生产的一级缓冲液pH值4,7和10重新标准化。结果表明,制备的缓冲RM足够均匀和稳定,其认证pH值分别为4.001±0.019、7.005±0.015和10.002±0.023。这些CRM将非常有用,作为校准品和PT样品,用于分析实验室在各个领域进行pH测量。
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Certification of buffer solutions reference materials using Baucke cell for supporting the quality of pH measurements
: The need for certified pH reference materials to support the traceability claims and quality of the daily large volume of pH measurements is very strong. In this work, three batches of buffer solutions were prepared, and their pH values were certified in accordance with the IUPAC Recommendation 2002. The first batch was prepared from potassium tetraoxalate (dihydrate) and disodium oxalate to provide pH4 and the second batch was prepared from disodium hydrogen phosphate and potassium dihydrogen phosphate to provide pH7. The third batch was prepared from sodium hydrogen carbonate and sodium carbonate to provide pH10. Every batch was homogenized by mechanical shaking for one night and bottled into 50 HDPE bottles, each is 250 mL. A number of bottles were systematically selected for homogeneity, stability and characterization studies of the buffer reference materials. These studies were carried out in accordance with the requirements of ISO 17034 and ISO Guide 35 using Baucke cell. The pH values 4, 7 and 10 of the secondary buffers were restandardized with regard to the pH values 4, 7 and 10 of the primary buffers produced by the Slovak National Metrology Institute, SMU. The results obtained showed that the produced buffer RMs were homogeneous and stable enough and their certified pH values were found 4.001±0.019, 7.005±0.015 and 10.002±0.023. These CRMs will be very useful as calibrants and as PT samples for analytical laboratories performing pH measurements in various fields.
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来源期刊
Journal of Chemical Metrology
Journal of Chemical Metrology CHEMISTRY, ANALYTICAL-
CiteScore
2.30
自引率
15.40%
发文量
7
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