SN/T 4761-2017 English PDF

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SN/T 4761-2017: Determination of fluorine in coal--High temperature hydrolyse-Auto potentiometric titration method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
SN/T 4761-2017	139	Add to Cart	2 days	Determination of fluorine in coal--High temperature hydrolyse-Auto potentiometric titration method	Valid

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SN/T 4763   GB/T 4633   GB/T 4632   SN/T 4763.2   SN/T 4762   

Basic data

Standard ID: SN/T 4761-2017 (SN/T4761-2017)
Description (Translated English): Determination of fluorine in coal--High temperature hydrolyse-Auto potentiometric titration method
Sector / Industry: Commodity Inspection Standard (Recommended)
Classification of Chinese Standard: D21
Word Count Estimation: 6,621
Date of Issue: 2017-05-12
Date of Implementation: 2017-12-01
Regulation (derived from): State-Quality-Inspection-Accreditation (2017) 228
Issuing agency(ies): General Administration of Customs

SN/T 4761-2017: Determination of fluorine in coal--High temperature hydrolyse-Auto potentiometric titration method

---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.
(Determination of fluoride in coal - High temperature combustion hydrolysis - Automatic potentiometric titration) People's Republic of China Entry-Exit Inspection and Quarantine Industry Standard Determination of fluorine in coal, high temperature combustion hydrolysis - Automatic potentiometric titration Released on.2017-05-12 2017-12-01 implementation People's Republic The General Administration of Quality Supervision, Inspection and Quarantine issued Entry and exit inspection and quarantine Industry Standard Determination of fluorine in coal, high temperature combustion hydrolysis - Automatic potentiometric titration China Standard Press Publishing First edition, April.2018

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed and managed by the National Certification and Accreditation Administration. The main drafting unit of this standard. Shanxi Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, Guangdong Entry-Exit Inspection of the People's Republic of China The Bureau of Diseases and China National Accreditation Center for Conformity Assessment. The main drafters of this standard. Zhao Fabao, Pan Yali, Shen Zijin, Su Zhiming, Yang Yanqiang, Liu Xiaolin, Yang Puchen, Liu Haifeng. Determination of fluorine in coal, high temperature combustion hydrolysis - Automatic potentiometric titration

1 Scope

This standard specifies the method for the determination of fluorine in coal by high temperature combustion hydrolysis-automatic potentiometric titration. This standard is applicable to the determination of fluorine in lignite, bituminous coal and anthracite. The measurement range is from 50μg/g to 1500μg/g.

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. Industrial analysis method of GB/T 212 coal Preparation method of GB/T 474 coal sample Preparation of standard solution for GB/T 602 chemical reagent impurity determination GB/T 4633 Determination method of fluorine in coal GB/T 6682 Analytical laboratory water specifications and test methods

3 Method summary

A certain amount of coal is burned and hydrolyzed in a mixed gas stream of oxygen and water vapor, and all of the fluorine in the coal is converted into volatile fluoride (SiF4 and HF) and completely dissolved in water. Add appropriate amount of absolute ethanol to the absorption liquid, use silver/silver chloride electrode as reference electrode, fluoride ion selective electricity The electrode is extremely indicated, and the content of fluorine is determined by automatic potentiometric titration with a cerium nitrate standard solution.

4 reagents and materials

Unless otherwise stated, this standard only uses high-grade pure reagents, and the experimental water should meet the first-grade water specified in GB/T 6682. 4.1 Oxygen, purity above 99.5%, free of combustible materials. 4.2 Quartz sand. particle size 0.5mm~1.0mm. 4.3 Anhydrous ethanol. analytically pure. 4.4 Fluorine standard stock solution (1000μg/mL). Prepare according to GB/T 602 method or directly use the national certified standard solution. 4.5 Fluorine standard solution (100μg/mL). Measure 10.0mL of fluorine standard stock solution (4.4) in a 100mL volumetric flask, dilute with water to the moment Degree, mix. Store at 4 ° C, valid for 1 month. 4.6 Nitrate nitrate standard titration solution (0.01mol/L) Preparation. Weigh 4.33g of lanthanum nitrate [La(NO3)3·6H2O] dissolved in water, transfer to 1000mL volumetric flask, dilute with water until now Degree, mix. Calibration. Measure 10.0mL of fluorine standard solution (100μg/mL) in a 100mL beaker, add 20mL of water, with constant stirring, add 30mL absolute ethanol (4.3), with silver/silver chloride electrode as reference electrode, fluoride ion selective electrode as indicator electrode, with standard lanthanum nitrate The solution was subjected to automatic potentiometric titration, and the volume V1 of the standard titration solution for the consumption of cerium nitrate was recorded. The titer of fluorine in the standard titration solution of cerium nitrate is expressed in micrograms per milliliter (μg/mL) and is calculated according to formula (1). ......

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