Traceability of pH measurements by glass electrode cells: performance characteristic of pH electrodes by multi-point calibration
Traceability of pH measurements by glass electrode cells: performance characteristic of pH electrodes by multi-point calibration
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玻璃电极电池 pH 测量的可追溯性：通过多点校准实现 pH 电极的性能特征
DOI：
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发表时间：
2002
影响因子：
4.3
通讯作者：
P. Spitzer
中科院分区：
文献类型：
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作者：
R. Naumann;Ch. Alexander;R. Eberhardt;J. Giera;P. Spitzer
抽象的。常规pH值测量使用pH计-玻璃电极组件进行。在大多数情况下，玻璃电极和参比电极被制成一个探头，即所谓的“组合电极”或简称为“pH电极”。这些电极的使用受到各种影响，如下所述，产生未知大小的不确定性。因此，样品pH值的测量需要通过可溯源至一级pH标准品的经认证标准缓冲溶液（CRM）进行适当校准。所使用的程序是基于在一个点、在两个点包围样品pH值和在一系列点的校准，即所谓的多点校准。如果在很大范围的未知pH值范围内要求最小的不确定度和最大的一致性，则建议使用多点校准（MPC）。详细的两点和MPC程序的不确定性计算。此外，多点校准是一个有用的工具，以验证pH电极的性能。这用不同的商业pH电极证明。如果您访问这篇文章，请访问http://dx.doi.org/10.1007/s00216-002-1506-5。在该页面（左侧的框架）上，有一个链接可以直接将您带到补充材料。
Abstract. Routine pH measurements are carried out with pH meter-glass electrode assemblies. In most cases the glass and reference electrodes are thereby fashioned into a single probe, the so-called 'combination electrode' or simply 'the pH electrode'. The use of these electrodes is subject to various effects, described below, producing uncertainties of unknown magnitude. Therefore, the measurement of pH of a sample requires a suitable calibration by certified standard buffer solutions (CRMs) traceable to primary pH standards. The procedures in use are based on calibrations at one point, at two points bracketing the sample pH and at a series of points, the so-called multi-point calibration. The multi-point calibration (MPC) is recommended if minimum uncertainty and maximum consistency are required over a wide range of unknown pH values. Details of uncertainty computations for the two-point and MPC procedure are given. Furthermore, the multi-point calibration is a useful tool to characterise the performance of pH electrodes. This is demonstrated with different commercial pH electrodes. Electronic supplementary material is available if you access this article at http://dx.doi.org/10.1007/s00216-002-1506-5. On that page (frame on the left side), a link takes you directly to the supplementary material.