GB/T 5484-2024Methods for chemical analysis of gypsum (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting:

This document replaces GB/T 5484-2012 "Chemical analysis method for gypsum": Compared with GB/T 5484-2012, except for the structural adjustment and compilation In addition to logical changes, the main technical changes are as follows:

a) Change "other analysis results are expressed on a dry basis (see 3:2)" to "other analysis results are expressed (on an as-received basis or on a dry basis)" The user shall make the selection and, if necessary, indicate whether it is the received basis result or the dry basis result” (see 4:2, 4:2 of the:2012 edition);

b) Deleted the following: “Convert the analytical results other than adhering water into dry basis results: Convert the measured as-received basis results Xr into The dry basis result X is calculated according to formula (17)" (see 7:1:2 of the:2012 edition);

c) Deleted "Determination of Chloride Ions - Phosphoric Acid Distillation-Mercury Salt Titration Method (Substitute Method)" (Chapter 37 of the:2012 Edition);

d) Added “Determination of chloride ion---ion chromatography (alternative method)” (see Chapter 38);

e) Deleted "Determination of Carbon Dioxide - Automatic Photoelectric Titration (Substitute Method)" (Chapter 39 of the:2012 Edition);

f) Added "Determination of Carbon Dioxide - Infrared Analysis (Substitute Method)" (see Chapter 39);

g) Added "Inductively coupled plasma emission spectrometry for determination of ferric oxide, aluminum oxide, magnesium oxide, titanium dioxide, Potassium, sodium oxide, manganese monoxide, phosphorus pentoxide (substitute method)" (see Chapter 40);

h) Added “Determination of water-soluble chromium (VI)” (see Chapter 41):

Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:

This document was proposed by China Building Materials Federation:

This document is under the jurisdiction of the National Cement Standardization Technical Committee (SAC/TC184):

This document was drafted by: China National Testing Holding Group Co:, Ltd:, Anhui Conch Cement Co:, Ltd:, Beijing New Construction Group Co:, Ltd:

Materials Co:, Ltd:, Xiamen Ace Standard Sand Co:, Ltd:, Baotou Steel Jidong Cement Co:, Ltd:, Liaocheng Xinyuan Group Co:, Ltd:, Mianyang Vocational Industrial Technology College, Quyang Jinyu Cement Co:, Ltd:, Taishan Gypsum Co:, Ltd:, Sinoma Pingxiang Cement Co:, Ltd:, Yunnan Building Materials Products Quality Inspection Institute, Jining Zhonglian Cement Co:, Ltd:, Ningxia Zhongce Measurement Testing and Inspection Institute (Co:, Ltd:), Guangxi Du'an Xijiang Yufeng Water Cement Co:, Ltd:, Three Gorges Public Inspection and Testing Center, Qiqihar Mengxi Cement Co:, Ltd:, Hunan Runyou Technology Development Co:, Ltd:, Beijing Cheng Jian Construction Engineering Co:, Ltd:, Anhui Menofu Technology Co:, Ltd:, Jiangsu Suyan Jingshen Co:, Ltd:, Shanxi Excellence Cement Co:, Ltd:, Oriental Yuhong Sand Powder Technology Group Co:, Ltd:

The main drafters of this document are: Lu Juanjuan, Li Qunfeng, Dai Ping, Xie Faquan, Sun Zhisheng, Cui Jian, Bai Hongcheng, Wang Xiaomei, Ma Zhaomo, Wang Ruihai, Zhang Qinghua, Zhang Gang, Wang Yalan, Wang Wei, Yu Bo, Lu Xiaoquan, Wang Qi, Li Chunxiang, Wang Yefei, Fu Hui, Gao Dandan, Jia Chunli, Zhang Junxing, Ren Jingyi, Duan Zhaohui, Liu Yamin, Li Fengwu, Bao Baliji, Zhang Yuxi, Lei Zhen, Li Chengguang, Deng Chenghong, Huang Hua, Wang Huan, Guo Meng, Huo Jundi, Song Shixia, Yang Shuhua, Liu Jiang, Lan Wenxian, Ji Shaowei, Liu Jie, Liu Bo, Xian Shigang, Liao Liping, Zhang Dachun, Cheng Wenbo, Jiang Hao, Teng Zhaohui, Mao Kai, Zhao Lun:

The previous versions of this document and the documents it replaces are as follows:

— First published in 1985, first revised in:2000, and second revised in:2012;

— This is the third revision:

1 Scope

This document specifies reference and alternative methods for the chemical analysis of natural gypsum, anhydrite and industrial by-product gypsum:

This document applies to natural gypsum, anhydrite and industrial by-product gypsum:

2 Normative references

GB/T 176

GB/T 2007

GB/T 6682

GB/T 12960

GB 31893

3 Terms and definitions

The following terms and definitions apply to this document: 3:1 receivedbase Based on the plaster as received: 3:2 Dry base The gypsum with attached water removed is taken as the benchmark, that is, the gypsum sample is dried to a constant state at 45°C±3°C:

4 Basic requirements for the test

4:1 Test times and requirements The number of tests for each determination is specified to be two, and the absolute difference between the two results is within the allowable difference of the same laboratory (see Table 3):

The average value of the test results represents the measurement result:

4:2 Expression of mass, volume, titer and results The mass is expressed in grams (g) with an accuracy of 0:0001g: The volume of the burette is expressed in milliliters (mL) with an accuracy of 0:01mL:

The unit of measurement is expressed in "milligram per milliliter (mg/mL)":

The concentration, titration degree and volume ratio of the standard titration solution shall be rounded off to four significant figures:

The pH value analysis results are rounded to one decimal place, and the water-soluble chromium (VI) analysis results are expressed in milligrams per kilogram (mg/kg) to the decimal place: