Measurement of pH. Definition, standards, and procedures
Measurement of pH. Definition, standards, and procedures
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DOI：
10.1351/pac200274112169
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发表时间：
2002-11-01
影响因子：
1.8
通讯作者：
Wilson, GS
中科院分区：
文献类型：
--
作者：
Buck, RP;Rondinini, S;Wilson, GS
“主要测量方法”的定义[1]允许充分考虑由主要方法（无转移细胞，harry细胞）确定的pH的主要标准的定义，通过次要方法确定的次要标准的定义，以及作为常规量的pH是否可以纳入国际公认的测量系统，国际单位制（SI, system International d'Unites）的问题。这种方法使以前的妥协得以解决IUPAC 1985年建议bbb。此外，结合主要方法和所有后续测量的不确定度，允许所有程序的不确定度通过一个不间断的比较链与主要标准联系起来。因此，分析人员可以合理选择适当的程序，以达到样品pH的目标不确定度。因此，本文件解释了IUPAC推荐的与5-50度范围内稀水溶液pH测量有关的定义、程序和术语。详细介绍了测量pH值的主要和次要方法，以及为选定的主要和次要物质分配具有适当不确定度的pH值的基本原理。
The definition of a "primary method of measurement" [1] has permitted a full consideration of the definition of primary standards for pH, determined by a primary method (cell without transference, Harried cell), of the definition of secondary standards by secondary methods, and of the question whether pH, as a conventional quantity, can be incorporated within the internationally accepted system of measurement, the International System of Units (SI, Systeme International d'Unites). This approach has enabled resolution of the previous compromise IUPAC 1985 Recommendations [2]. Furthermore, incorporation of the uncertainties for the primary method, and for all subsequent measurements, permits the uncertainties for all procedures to be linked to the primary standards by an unbroken chain of comparisons. Thus, a rational choice can be made by the analyst of the appropriate procedure to achieve the target uncertainty of sample pH. Accordingly, this document explains IUPAC recommended definitions, procedures, and terminology relating to pH measurements in dilute aqueous solutions in the temperature range 5-50 degreesC. Details are given of the primary and secondary methods for measuring pH and the rationale for the assignment of pH values with appropriate uncertainties to selected primary and secondary substances.