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GA/T 1946-2021 English PDF

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GA/T 1946-2021: Forensic sciences - Examination methods for hydrochloric acid, sulfuric acid and nitric acid - Chemical analysis and ion chromatography
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PDF similar to GA/T 1946-2021


Standard similar to GA/T 1946-2021

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Basic data

Standard ID GA/T 1946-2021 (GA/T1946-2021)
Description (Translated English) Forensic sciences - Examination methods for hydrochloric acid, sulfuric acid and nitric acid - Chemical analysis and ion chromatography
Sector / Industry Public Security (Police) Industry Standard (Recommended)
Classification of Chinese Standard A92
Classification of International Standard 13.310
Word Count Estimation 11,153
Date of Issue 2021-10-14
Date of Implementation 2022-05-01
Issuing agency(ies) Ministry of Public Security

GA/T 1946-2021: Forensic sciences - Examination methods for hydrochloric acid, sulfuric acid and nitric acid - Chemical analysis and ion chromatography


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Forensic sciences - Examination methods for hydrochloric acid, sulfuric acid and nitric acid - Chemical analysis and ion chromatography ICS 13.310 CCSA92 People's Republic of China Public Security Industry Standards Forensic Science Hydrochloric, Sulfuric and Nitric Acid Tests Chemistry and Ion Chromatography Released on 10-14-2021 2022-05-01 Implementation Released by the Ministry of Public Security of the People's Republic of China Published by China Standard Press

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 contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document was proposed by the National Criminal Technology Standardization Technical Committee Physical and Chemical Inspection Sub-Technical Committee (SAC/TC179/SC4) and submitted Focus on. This document was drafted by. Beijing Public Security Judicial Appraisal Center, Physical Evidence Appraisal Center of the Ministry of Public Security, People's Public Security University of China, China Criminal Police Police Academy, Shanghai Public Security Bureau Evidence Identification Center, Tianjin Public Security Bureau Evidence Identification Center, Guangdong Provincial Public Security Bureau Criminal Technology Center, Guangxi Zhuang Nationality Autonomous Region Public Security Bureau Criminal Investigation Corps, Heilongjiang Provincial Public Security Bureau Criminal Technology Corps, Jilin Provincial Public Security Bureau Material Evidence Appraisal Center, Guangzhou Public Security Bureau Criminal Technology Institute of Security Bureau, Criminal Division of Criminal Police Detachment of Jinan Public Security Bureau, Technical Division of Criminal Police Detachment of Qingdao Public Security Bureau, Criminal Investigation Branch of Dalian Public Security Bureau Team Criminal Science and Technology Division. The main drafters of this document. Li Shenglin, Xu Xiaoyu, Liu Zhanfang, Liu Huijuan, Guo Hongling, Hu Can, Mei Hongcheng, Lian Jie, Zhang Liang, Cai Zhicheng, Lu Xiaobao, Wang Yongqing, Wang Yong, Qi Wentao, Wu Jifeng, Wang Bin, Li Xinqian. Forensic Science Hydrochloric, Sulfuric and Nitric Acid Tests Chemistry and Ion Chromatography

1 Scope

This document specifies chemical and ion chromatographic methods for the examination of hydrochloric, sulfuric and nitric acids in the forensic field. This document is applicable to the qualitative analysis of hydrochloric acid, sulfuric acid and nitric acid in the field of forensic science, and other fields can also be used as a reference.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 9724 General Rules for Determination of pH Value of Chemical Reagents GA/T 242 Physicochemical Examination Terminology for Trace Evidence in Forensic Science

3 Terms and Definitions

The terms and definitions defined in GB/T 9724 and GA/T 242 apply to this document.

4 principles

4.1 Measuring principle of pH meter or pH test paper Measure the concentration of hydrogen ions in the solution with a pH meter or pH test paper. 4.2 Measuring principle of hydrochloride ion (chloride ion), sulfate ion and nitrate ion 4.2.1 Chemical methods Chemical test of chloride ion (Cl-). Chloride ion can react with silver nitrate solution to form a white precipitate which is insoluble in nitric acid. Starch can be dissolved in ammonia water. Cl- Ag →AgCl↓(white) AgCl 2NH3·H2O→Ag(NH3)2Cl 2H2O Chemical examination of sulfate ion (SO42-). Sulfate ion can react with barium chloride solution to form white precipitate which is insoluble in hydrochloric acid starch. Ba2 SO42- → BaSO4↓ (white) Chemical inspection of nitrate ion (NO3-). There are usually two chemical inspection methods for the inspection of nitrate, which are. a) Under acidic conditions, the zinc powder in the nitrate powder reagent reduces nitrate ions to nitrite ions, nitrite ions and nitric acid The p-aminobenzenesulfonic acid in the acid radical powder reagent reacts to generate p-benzenesulfonic acid diazonium salt, and then reacts with the menaphthylamine in the nitrate powder reagent, Generate red azo dyes, the depth of red is related to the nitrate content in the leaching solution, most of them are orange red; b) Nitric acid can react with strychnine to produce red color.

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