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GB/T 36791-2018: Determination of bromine in organic flame retardant -- Oxygen bomb combustion-ion selective electrode method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 36791-2018 | English | 119 |
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Determination of bromine in organic flame retardant -- Oxygen bomb combustion-ion selective electrode method
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GB/T 36791-2018
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Basic data | Standard ID | GB/T 36791-2018 (GB/T36791-2018) | | Description (Translated English) | Determination of bromine in organic flame retardant -- Oxygen bomb combustion-ion selective electrode method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G40 | | Classification of International Standard | 71.040.50 | | Word Count Estimation | 6,699 | | Date of Issue | 2018-09-17 | | Date of Implementation | 2019-04-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 36791-2018: Determination of bromine in organic flame retardant -- Oxygen bomb combustion-ion selective electrode method
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(Determination of bromine content in bromine-containing organic flame retardant chemicals - Oxygen bomb combustion - Ion selective electrode method)
ICS 71.040.50
G40
National Standards of People's Republic of China
Determination of bromine content in bromine-containing organic flame retardant chemicals
Oxygen bomb combustion-ion selective electrode method
Published on.2018-09-17
Implementation of.2019-04-01
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63).
This standard was drafted. Guangzhou Building Materials Industry Research Institute Co., Ltd., Jinan Taixing Chemical Co., Ltd., Beijing Institute of Technology, Mountain
East Product Quality Supervision and Inspection Institute.
The main drafters of this standard. Yi Aihua, Wang Yanhui, Li Xiangmei, Yang Zhan, Deng Xiaobo.
Determination of bromine content in bromine-containing organic flame retardant chemicals
Oxygen bomb combustion-ion selective electrode method
Caution - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the relevant national regulations.
1 Scope
This standard specifies the method for the determination of bromine content in bromine-containing organic flame retardant chemicals by oxygen bomb combustion-ion selective electrode method.
This standard applies to the determination of bromine content in bromine-containing organic flame retardant chemicals.
This standard does not apply to insoluble bromides present in bromine-containing organic flame retardant chemicals or produced during combustion.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 14402 Determination of combustion calorific value of building materials and products
3 Principle
The sample is fully combusted in an oxygen bomb combustion drum containing an alkaline solution under pure oxygen conditions, and the bromine is converted into bromide ions and absorbed by the alkaline solution.
The bromine content in the absorbing solution was then determined using a bromide ion selective electrode.
4 reagents
4.1 Unless otherwise stated, the reagents used in this standard are of analytical grade, and the water used is the third grade water specified in GB/T 6682.
4.2 Potassium hydroxide solution [c(KOH) = 0.5 mol/L]. 2.8 g of potassium hydroxide was dissolved in 100 mL of water.
4.3 Hydrogen peroxide solution [c(H2O2)=3%]. 10 mL of a 30% strength hydrogen peroxide solution was diluted to 100 mL.
4.4 Bromide standard storage solution [c(Br)]=1.0mol/L. Potassium bromide is dried at 130 °C for 2 h in advance, and then accurately weighed 119.0 g
Dissolve in water, then transfer to a 1000mL volumetric flask and dilute to volume, then obtain bromide standard storage solution.
4.5 Bromide standard solution A[c(Br)=100.0mmol/L]. Pipette 50.0mL bromide standard storage solution in 500mL capacity
Dilute to the mark with water and mix well.
4.6 Bromide standard solution B[c(Br)=10.0mmol/L]. Pipette 50.0mL of bromide standard solution A in 500mL volumetric flask
Dilute to the mark with water and mix.
4.7 Ionic strength modifier [c(KNO3)=1.0mol/L]. Dissolve 101.1g of potassium nitrate (KNO3) in about 500mL of water and transfer
In a 1000 mL volumetric flask, add water to volume.
5 instruments
5.1 bromide ion selective electrode, the concentration of bromide ion is required to be in the range of 5.0×10-6mol/L~1.0mol/L, and the electrode potential and bromide ion are concentrated.
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