SN/T 2087.2: Evolution and historical versions
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| SN/T 2087.2-2024 | English | RFQ |
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(Determination of chlorine in coal - Part 2: Automatic potentiometric titration)
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SN/T 2087.2-2024
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| SN/T 2087.2-2011 | English | 189 |
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Determination of chlorine content in coal. Part 2: Combustion bomb-auto potentiometric titration method
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SN/T 2087.2-2011
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Basic data | Standard ID | SN/T 2087.2-2024 (SN/T2087.2-2024) | | Description (Translated English) | (Determination of chlorine in coal - Part 2: Automatic potentiometric titration) | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 73.040 | | Date of Issue | 2024-12-31 | | Date of Implementation | 2025-07-01 | | Issuing agency(ies) | General Administration of Customs | SN/T 2087.2-2011: Determination of chlorine content in coal. Part 2: Combustion bomb-auto potentiometric titration method
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Determination of chlorine content in coal.Part 2. Combustion bomb-auto potentiometric titration method
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Determination of chlorine in coal - Part 2. Oxygen Bomb Combustion -
Automatic potentiometric titration
Part 2. Combustionbomb-autopotentiometrictitrationmethod
Issued on. 2011-09-09
2012-04-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
SN /"Determination of Chlorine in Coal" T 2087 series of standards is divided into two parts.
--- Part 1. High performance liquid chromatography;
--- Part 2. oxygen bomb combustion - automatic potentiometric titration.
This section SN/T 2087 Part 2.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section proposed and managed by the National Certification and Accreditation Administration Committee.
This section was drafted by. People's Republic of China Shanxi Exit Inspection and Quarantine, Ningbo Entry-Exit Inspection and People's Republic of China
Quarantine Bureau.
The main drafters of this section. hair Zhao Bao, Chen Jianguo, even GY, Pan Yali, forest edge, Yang Xiaobing, ZHAO Lin Qiang, Yang Yanqiang.
Determination of chlorine in coal - Part 2. Oxygen Bomb Combustion -
Automatic potentiometric titration
1 Scope
This section SN/T 2087 provisions for the determination of Chlorine in Coal Combustion Bomb - automatic potentiometric titration.
This section applies to the determination of chlorine in coal, the measurement range of 0.03% to 0.30%.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
Analysis Method GB/T 212 coal
Heat GB/T 213 Determination of coal
GB 474 coal sample preparation
3 Method summary
A certain amount of coal filled with an excess of oxygen in the oxygen bomb combustion, releasing chlorine is absorbed dilute alkali solution. Rinsed with water oxygen bomb, the absorbent liquid
All transferred to a beaker and acidified with nitric acid, silver composite electrode for the measuring electrode, silver nitrate standard solution automatic potentiometric titration
Chlorine content.
4 Reagents and materials
Unless otherwise specified, this section uses only excellent pure reagents and resistivity greater than or equal to 18.2MΩ · cm of ultra-pure water.
4.1 nitric acid (ρ = 1.42g/mL).
4.2 ammonium carbonate.
4.3 silver nitrate.
4.4 sodium chloride, reference reagents.
4.5 ammonium carbonate solution (100g/L). Weigh 100g superior grade of pure ammonium carbonate was dissolved in 1000mL of water, mix, transferred to a vial.
The time is now equipped with.
4.6 standard silver nitrate solution [c (AgNO3) = 0.025mol/L]. Weigh accurately pre-dried at 110 ℃ 1h superior grade pure silver nitrate
4.2472g, dissolved in a little water, then transferred to 1000mL brown volumetric flask, diluted with water to the mark.
4.7 standard solution of sodium chloride (chloride ion concentration of 0.20mg/mL). Weigh accurately beforehand (500 ~ 600) ℃ burning of reference chloro 1h
Sodium 0.3298g, dissolved in a little water, then transferred to 1000mL volumetric flask, diluted with water to the mark.
4.8 Oxygen. purity 99.5%, non-combustible components, do not allow the use of electrolytic oxygen.
5 instruments and equipment
5.1 oxygen bomb combustion device include. oxygen bomb combustion dish, ignition wires, cooling water bath, etc., should be consistent with the provisions of GB/T 213's.
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