GB/T 6368-2008 in English

《GB/T 6368-2008表面活性剂 水溶液pH值的测定 电位法》由TC63（全国化学标准化技术委员会）归口，TC63SC8（全国化学标准化技术委员会(特种)界面活性剂分会）执行，主管部门为中国石油和化学工业联合会。
本标准于１９８６年首次发布，于１９９３年第一次修订。本标准代替ＧＢ／Ｔ６３６８―１９９３《表面活性剂　水溶液ｐＨ 值的测定　电位法》。本标准规定了采用电位法测定表面活性剂水溶液pH值的方法。适用于表面活性剂水溶液pH值测定。
本标准等同采用ＩＳＯ４３１６：１９７７《表面活性剂　水溶液ｐＨ 值的测定　电位法》。
本标准与前版的主要差异：
―――增加了前言部分；
―――提高了采标程度；
―――增加了测量样品数量，与国际标准一致；
―――增加了试验报告章节。

1 Scope

This standard specifies a method for the determination of the pH of aqueous solutions of surface active agents by potentiometric method.
This method is applicable to the determination of the pH of aqueous solutions of surface active agents.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 603-2002 Chemical reagent — Preparations of reagent solutions for use in test methods
GB/T 6682-1992 Water for laboratory use — Specifications