GB/T 43875-2024Determination method of total chromium in cement raw materials (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: 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:, Inner Mongolia Mengwei Technology Co:, Ltd:, Laishui Jinyu Jidong Environmental Protection Technology Co:, Ltd:, Hebei Jinyu Dingxin Cement Co:, Ltd:, Jiayuguan Qilianshan Cement Co:, Ltd: Company, Gezhouba Shimen Special Cement Co:, Ltd:, Guangling Jinyu Cement Co:, Ltd:, Chongqing Jiulong Wanbo New Materials Technology Co:, Ltd:, Ling Sichuan Jinyu Jidong Environmental Protection Technology Co:, Ltd:, Jiyuan Zhonglian Cement Co:, Ltd:, Jiangsu Hengshan Nanfang Cement Co:, Ltd:, Jiangsu Shanhe Cement Co:, Ltd: Co:, Ltd:, Southern Cement Co:, Ltd:, Rizhao Zhonglian Port Cement Co:, Ltd:, Tianjin Cement Industry Design and Research Institute Co:, Ltd:, Zhejiang Hongshi Environmental Protection Co:, Ltd:, Shandong Dongyuan New Materials Technology Co:, Ltd:, Changshan Jiangshanhu Cement Co:, Ltd:, Anhui Menofu Technology Co:, Ltd: Co:, Ltd:, Ningxia Zhongce Measurement Testing and Inspection Institute (Co:, Ltd:), Inner Mongolia Yidong Jidong Cement Co:, Ltd:, Inner Mongolia Mengxi Cement Co:, Ltd: Tangshan Jidong Cement Co:, Ltd: Tangshan Branch, Wuhai Xishui Cement Co:, Ltd:, Guangxi Du'an Xijiang Yufeng Cement Co:, Ltd: Co:, Ltd:, Shandong Chongzheng Special Cement Co:, Ltd:, Dongping Zhonglian Cement Co:, Ltd:, Baoding Taihang Heyi Environmental Protection Technology Co:, Ltd:, Taiwan Cement (Yingde) Cement Co:, Ltd:, Shanxi Yamei Construction Engineering Materials Co:, Ltd:, Gansu Jinglan Cement Co:, Ltd:, Shanghai Yunbi Technology Co:, Ltd: Co:, Ltd:, Jiahua Special Cement Co:, Ltd:, Yunnan Building Materials Product Quality Inspection Institute, and Jidong Cement Tongchuan Co:, Ltd: The main drafters of this document are: Wang Wei, Zhang Qinghua, Wang Ruihai, Li Qunfeng, Xie Faquan, Gu Xiaohua, Dai Ping, Zhang Donghua, Liu Jie, Zhang Zhihui, Guo Meng, Wang Litao, Zhang Hao, Jiang Zhaohui, Guo Wu, Chen Guoyou, Yang Kairui, Han Yanfeng, Shen Baoming, Xia Xiaosong, Cao Jinpei, Zhang Hongmei, Liu Jiahai, Liu Tao, Wang Jianggen, Li Chunping, Wang Na, Chen Bo, Zhang Dachun, Zhao Junhui, Lei Zhen, He Biao, Zhao Ning, Wang Xuemin, Wu Duanjing, Hu Zhigang, Yin Cuiling, Zhang Wenhua, Wang Zhitong, Shao Chenggong, Wang Xiuchang, Chen Jing, Wu Lichan, Zhang Bo, Xiang Changhuai, Li Anlin, Chen Xuemei, Zhu Shu, He Lixin, Zhai Shengli, Li Shengbao, Cui Jie, Cao Jianming, Peng Xueping, Huang Minrui, Zhou Gang, Zhang Jianhua, Lan Chengke, Niu Hailong, Lan Wei, Zhong Na, Sheng Kun, Qin Jie, Lu Juanjuan, Cui Jian, Wang Yalan, Jiang Hao, Gao Dandan, Song Laishen, Liu Bo, Wang Changan: Determination of total chromium in cement raw materials

1 Scope

GB/T 43875-2024 gives the methods for measuring total chromium in cement raw materials, and the reason to measure it at the raw material stage is what happens later. Chromium entering the kiln in the limestone, clay, iron corrective or fuel ash is partly oxidised to the hexavalent form during clinker burning, and hexavalent chromium in wet cement causes allergic contact dermatitis in construction workers - the historical occupational disease known as cement eczema, which is why several jurisdictions cap it and why producers add reducing agents. Controlling the outcome means knowing the input, and the input varies with every quarry face and every alternative fuel accepted. This document specifies three methods for determining total chromium in cement raw materials: inductively coupled plasma optical emission spectrometry, flame atomic absorption spectrophotometry and diphenylcarbazide spectrophotometry - three because plants differ in what instrumentation they have, and the spectrophotometric route needs none. Under ICS 91.100.10 and CCS Q11, it is written for cement plant laboratories, for raw material and alternative fuel suppliers, and for the occupational health and product certification authorities.

This document specifies the methods of inductively coupled plasma optical emission spectrometry, flame atomic absorption spectrophotometry and diphenylcarbazide spectrophotometry: Method for determining the total chromium content in cement raw materials by chromatographic method: This document applies to the determination method of total chromium in cement raw materials:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document: For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document: GB/T 2007:

1 General rules for sampling and sample preparation of bulk mineral products Manual sampling method

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 8170 Rules for rounding off values and expression and determination of limit values JJG196 Verification procedures for commonly used glass measuring instruments

3 Terms and definitions

There are no terms or definitions that require definition in this document:

4 Basic requirements for the test

1 Test times and requirements Each sample is measured twice independently using the method listed in this document: The absolute difference between the two results is within the allowable difference in the same laboratory (see Table 5): The average value of two test results is used to express the test result: 4:

2 Expression of mass, volume, titer and results The mass is expressed in grams (g) with an accuracy of 0:0001 g: The volume of the burette is expressed in milliliters (mL) with an accuracy of 0:01 mL: The analysis results are expressed in milligrams per kilogram (mg/kg): When the result is less than 1000 mg/kg, the result is rounded to one decimal place: When the result is greater than or equal to 1000 mg/kg, retain four significant figures: The rounding of numerical values shall be in accordance with the provisions of GB/T 8170: 4:

3 Blank test A blank test is performed along with the sample: Without adding the sample, the test is performed according to the same test steps and using the same amount of reagents: The obtained measurement results are corrected: 4:

4 General Unless otherwise specified, the reagents used in inductively coupled plasma emission spectrometry and flame atomic absorption spectrophotometry should be no less than high grade