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GB/T 4348.2-2014: Sodium hydroxide for industrial use -- Determination of sodium chloride content -- Mercury metric method
Status: Valid GB/T 4348.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4348.2-2014 | English | 189 |
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Sodium hydroxide for industrial use -- Determination of sodium chloride content -- Mercury metric method
| Valid |
GB/T 4348.2-2014
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| GB/T 4348.2-2002 | English | 319 |
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Sodium hydroxide for industrial use -- Determination of sodium chloride content -- Mercurimetric method
| Obsolete |
GB/T 4348.2-2002
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| GB/T 4348.2-1984 | English | 199 |
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Sodium hydroxide for industrial use--Determination of sodium chloride content--Mercurimetric method
| Obsolete |
GB/T 4348.2-1984
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PDF similar to GB/T 4348.2-2014
Basic data | Standard ID | GB/T 4348.2-2014 (GB/T4348.2-2014) | | Description (Translated English) | Sodium hydroxide for industrial use -- Determination of sodium chloride content -- Mercury metric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G11 | | Classification of International Standard | 71.060.40 | | Word Count Estimation | 8,832 | | Date of Issue | 9/3/2014 | | Date of Implementation | 5/1/2015 | | Older Standard (superseded by this standard) | GB/T 4348.2-2002 | | Quoted Standard | GB/T 603; GB/T 6682; GB/T 29643 | | Adopted Standard | ISO 981-1973(2011), NEQ | | Regulation (derived from) | People's Republic of China Announcement of Newly Approved National Standards No. 21 of 2014 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies sodium hydroxide, sodium chloride industrial methods with determination. This Standard is applicable to sodium chloride (mass fraction) is greater than 0. 005% of the product. | GB/T 4348.2-2014: Sodium hydroxide for industrial use -- Determination of sodium chloride content -- Mercury metric method
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Sodium hydroxide for industrial use.Determination of sodium chloride content.Mercurimetric method
ICS 71.060.40
G11
National Standards of People's Republic of China
Replacing GB/T 4348.2-2002
Hydroxide for industrial use
Determination of sodium chloride content of mercury Method
Issued on. 2014-09-03
2015-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard replaces GB/T 4348.2-2002 "sodium hydroxide for industrial use - Determination of mercury Method." And GB/T 4348.2-
Compared to 2002, the main technical changes are as follows.
--- Remove the foreword to international standards (see the 2002 edition of the International Standard foreword);
--- Increasing the normative references (see Chapter 2);
--- Increase warning (see Chapter 4);
--- Revised analysis of the reagents and test water regulations (see 41, 2002 edition of Chapter 4);
--- Marking an increase of single pipette level requirements (see 5.2);
--- Increased Buret accuracy and grade requirements (see 5.3, 5.4 and 5.5);
--- Increased laboratory sample requirements (see 61, 2002 version 6.1.);
--- Modify the sample solution (11) the amount of nitric acid solution (see 62, 2002 version 6.2.);
--- Added "Test Report" section (see Chapter 9);
--- Increased normative appendix (see Appendix A, 2002 edition of 4.5.1 and 4.5.2).
The standard reference method using redrafted ISO 981. 1973 (2011) Determination of mercury content "industrial sodium chloride content
Law ", and ISO 981. 1973 conformance degree (2011) is not equivalent.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee chlor-alkali chemical branch (SAC/TC63/SC6) centralized.
This standard was drafted. Xinjiang Zhongtai Chemical Co., Ltd. Jinxi Chemical Industry Institute.
The main drafters of this standard. Chenpei Yun, Liang Bin, Li Furong, Hu Liming, Tianyou Li.
This standard replaces the standards previously issued as follows.
--- GB/T 4348.2-1984, GB/T 4348.2-2002.
Hydroxide for industrial use
Determination of sodium chloride content of mercury Method
1 Scope
This standard specifies the method for sodium hydroxide for industrial use in the determination.
This standard applies to sodium chloride content (mass fraction) is greater than 0.005% of the product.
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 603 chemical reagent in test methods - Preparations with
Laboratory use specifications and test methods GB/T 6682 Analysis
GB/T 29643 Industrial laboratory samples with sodium hydroxide and the main project prepared solution was measured
Principle 3
In the pH2 ~ 3 solution, strong ionization of mercury in nitric acid chloride into weakly ionized mercuric chloride with hydrazine diphenylcarbazone directs
Agents, with a slight excess of divalent mercury ions generated purple complex is the end.
4 Reagents and materials
Warning. toxic mercury nitrate. Nitric acid and sodium hydroxide is corrosive. The user's responsibility to take appropriate safety and health practices.
4.1 General provisions. The method of the reagents and water in the absence of other provisions indicated, refers analytical grade or above and GB/T 6682 in
Three predetermined water or equivalent purity. Test preparation and products required, in the absence of other provisions, according to GB/T 603 provisions
preparation.
4.2 nitric acid solution. 11. NO-2 content is high, the end point of the titration significant interference. When they find titration end did not change significantly when the nitrate
Acid solution should be reconstituted.
4.3 nitric acid solution. 2mol/L.
4.4 Sodium hydroxide solution. 2mol/L.
Sodium chloride 4.5 Standard solution. 0.05mol/L. Weigh 500 ℃ to constant burning 1h reference reagent sodium chloride 2.9221g, add a little water
Dissolved and transferred to 1000mL volumetric flask, dilute with water release to the mark.
4.6 nitrate mercury standard titration solution. c [1/2Hg (NO3) 2] = 0.05mol/L. Calibrated according to Appendix A requirements.
4.7 nitrate mercury standard titration solution. c [1/2Hg (NO3) 2] = 0.005mol/L. Single marking pipette mercuric nitrate Pipette calibration standard after
Associate titration solution (see 4.6) 50mL, 500mL flask placed, diluted with water [dilution should be supplemented with an appropriate amount of nitric acid solution (see 4.2) to
Prevent mercury nitrate decomposition] to the mark.
4.8 bromophenol blue indicator solution. 1g/L.
4.9 diphenylcarbazone hydrazide indicator solution. 5g/L.
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