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SN/T 3996-2014: Determination of fluoride content in calcined magnesite - Ion selective electrode method
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| SN/T 3996-2014 | English | 159 |
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Determination of fluoride content in calcined magnesite - Ion selective electrode method
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SN/T 3996-2014
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Basic data | Standard ID | SN/T 3996-2014 (SN/T3996-2014) | | Description (Translated English) | Determination of fluoride content in calcined magnesite - Ion selective electrode method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | D52 | | Classification of International Standard | 73.080 | | Word Count Estimation | 6,618 | | Date of Issue | 12/1/2014 | | Date of Implementation | 5/1/2015 | | Quoted Standard | GB/T 6379.2; GB/T 6682 | | Regulation (derived from) | State-Quality-Inspection-accreditation [2014] 614 | | Issuing agency(ies) | General Administration of Customs | | Summary | This standard specifies the ion selective electrode method for the determination of fluorine in magnesium light burning method. This standard applies to light burning magnesium fluoride (as F) content determination. Measurement range (mass fraction): 0.01 | SN/T 3996-2014: Determination of fluoride content in calcined magnesite - Ion selective electrode method
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(Light burning magnesium fluoride ion selective electrode determination)
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Light burning magnesium fluoride by ion selective electrode method
Issued on. 2014-11-19
2015-05-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. People's Republic of China Liaoning Province Exit Inspection and Quarantine.
The main drafters of this standard. Zeng Ze, of Interferon Xu Jing, Wang Jian, Qiu pay more, Jiang Xiaoguang, Xie Yan, Lin Xiaomei.
Light burning magnesium fluoride by ion selective electrode method
1 Scope
This standard specifies the ion selective electrode method for the determination of fluorine in magnesium light burning method.
This standard applies to light burning magnesium fluoride (as F) content determination. Measurement range (mass fraction). 0.010% to 0.15%.
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.
GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the standard measurement method to repeat
Of the basic methods of reproduction
Laboratory use specifications and test methods GB/T 6682 Analysis
3 Method summary
Samples with hydrochloric acid under microwave decomposed, sodium citrate was added as a masking agent, at pH6 ~ pH6.5 conditions, fluorine ion selective
Electrode measuring electrode, calomel electrode as the reference electrode measuring potential. The potential is measured by a standard solution the fluorine content in the sample is calculated.
4 Reagents
Unless otherwise indicated, the reagents used in the analysis were pure class distinctions. Test water should comply with a water GB/T 6682 regulations.
4.1 hydrochloric acid solution (11).
4.2 Sodium hydroxide solution (200g/L). Weigh 50g of sodium hydroxide dissolved in 250mL water, transferred to a plastic jug and set aside.
4.3 sodium citrate solution (1mol/L).
4.4 fluoro standard stock solution (1000mg/L). Weigh 2.2101g previously dried to constant weight at 105 ℃ ~ 110 ℃ sodium fluoride place
150mL beaker, add water to dissolve, transferred to a 1000mL volumetric flask, dilute to the mark, shake. Transferred to a dry plastic bottles
The sealed.
4.5-fluoro standard solution (80mg/L). Pipette 80.00mL fluoro standard stock solution (4.4) into a 1000mL volumetric flask, diluted with water
To the mark. Transferred to a dry plastic bottle sealed.
4.6 ethanol (AR).
4.7 Alizarin Red S indicator (1g/L). Weigh 0.1g Alizarin Red S dissolved in 100mL of 25% ethanol (4.6 ml).
4.8 magnesium matrix solution. Weigh 20.000g purity magnesium rods (99.99%) into a beaker, adding a small amount of water. Continuously added in small
280mL of hydrochloric acid solution (4.1). Be careful during the addition. Initially, a small amount of hydrochloric acid was added (4.1), to prevent violent reaction caused by darting,
The reaction to be slowed down, and then continue adding a small amount of hydrochloric acid solution (4.1), until all is added. Cooled, transferred to 500mL volumetric flask, diluted with water
Volume.
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