The main technical changes between this standard and the original industry standard Hg / T 2822-1996 are as follows: according to the different corrosion inhibitors, they are divided into two categories. Class 1 is lithium chromate as corrosion inhibitor, and class 11 is lithium molybdate as corrosion inhibitor (3.2 in 1996, 4.2 in this edition)
-Based on the original standard, the chloride index of class 1 lithium chromate as corrosion inhibitor was adjusted from no more than 0.25% to no more than 0.15% (version 3.2 of 1996, version 4.2 of this version)
-11类钥酸锂作缓蚀剂类用钼酸锂指标取代1类中铬酸锂指标（1996年版3.2，本版4.2）
-Lithium molybdate index is used as corrosion inhibitor in class 11 instead of lithium chromate index in class 1 (3.2 in 1996, 4.2 in this edition)
Silver nitrate titration is used for the determination of lithium bromide content in the original standard, and potentiometric titration is used for the determination of lithium bromide content in this standard (5.3 in 1996, 5.3 in this edition).
The content of lithium chromate in the original standard is determined by sodium thiosulfate titration, and the content of lithium chromate in this standard is determined by spectrophotometry (version 5.5, 1996, version 5.5.1)
一本标准增加了钼酸锂含量测定的试验方法。
A test method for the determination of lithium molybdate content is added to this standard.
The original standard chloride content is determined by back titration of sodium thiocyanate solution, and this standard chloride content is determined by potentiometric titration (version 5.6, 1996, version 5.6).
本标准由中国石油和化学工业协会提出。
This standard is proposed by China Petroleum and Chemical Industry Association.
本标准由全国化学标准化技术委员会无机化工分会（SAC/TC63/SC1）归口。
This standard is under the jurisdiction of inorganic chemical branch of national chemical Standardization Technical Committee (SAC / tc63 / SC1).
This standard is drafted by Tianjin Chemical Research and Design Institute, Changshu Kejie central air conditioning service Co., Ltd. (Nantong Kejie chemical plant), Lianyungang Xinpu Zhensheng lithium desertification plant and Wuhan Steel construction and Installation Engineering Co., Ltd.
本标准主要起草人：弓创周、严峰、李正胜、鲁定华、赵美敬、张平。
Main drafters of this standard: Gong chuangzhou, Yan Feng, Li Zhengsheng, Lu Dinghua, Zhao Meijing, Zhang Ping.
本标准所代替标准的历次版本发布情况：
The previous versions of the standards replaced by this standard are as follows: