总余氯标准物质研制

doi:10.3969/j.issn.1000-1158.2023.12.18

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Abstract Residual chlorine is an important indicator for water quality monitoring and an important parameter for judging water quality.For this reason, the national second-class total residual chlorine reference materials GBW(E)084725, GBW(E)084726 were developed. According to the commonly used measurement methods of total residual chlorine, the method suitable for the calibration of reference materials was selected, and the methodology of the calibration method was studied. The homogeneity and stability of total residual chlorine reference materials with two concentrations were tested respectively. The F value of variance test was less than the critical value, indicating that the homogeneity of the reference material was good. During the six month stability investigation period, there was no statistically significant change in the reference materials with two contents. At the same time, ten day short-term high and low temperature simulation experiments were conducted. The results showed that there was no significant change statistically in the reference materials with two contents either, which indicated the stability of the two reference materials was good. The redox titration method was used for the determination of reference materials. The quantity values were 50mg/L and 500mg/L respectively, and the relative expanded uncertainty was 0.9% and 0.5% (k=2) respectively.

Key words： reference material;total residual chlorine;water quality monitoring redox titration method;uncertainty

Received: 21 July 2022 Published: 27 December 2023

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TB99

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	Articles by authors
	GONG Wei
	YAO Xu-xia
	TIAN Ping
	Lü Hui
	LIU Xin

Cite this article:

GONG Wei,YAO Xu-xia,TIAN Ping, et al. Development of Total Residual Chlorine Reference Material[J]. Acta Metrologica Sinica, 2023, 44(12): 1912-1918.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2023.12.18 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2023/V44/I12/1912

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