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GB/T 4348.3-2012: Sodium hydroxide for industrial use - Determination of iron content. 1, 10-phenanthroline photometric method
Status: Valid GB/T 4348.3: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4348.3-2012 | English | 169 |
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Sodium hydroxide for industrial use - Determination of iron content. 1, 10-phenanthroline photometric method
| Valid |
GB/T 4348.3-2012
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| GB/T 4348.3-2002 | English | 279 |
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Sodium hydroxide for industrial use -- Determination of iron content-1, 10 -- Phenanthroline photometric method
| Obsolete |
GB/T 4348.3-2002
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| GB/T 4348.3-1984 | English | 199 |
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Sodium hydroxide for industrial use--Determination of iron content--o-phenanthroline photometric method
| Obsolete |
GB/T 4348.3-1984
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PDF similar to GB/T 4348.3-2012
Basic data | Standard ID | GB/T 4348.3-2012 (GB/T4348.3-2012) | | Description (Translated English) | Sodium hydroxide for industrial use - Determination of iron content. 1, 10-phenanthroline photometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G11 | | Classification of International Standard | 71.060.40 | | Word Count Estimation | 7,738 | | Older Standard (superseded by this standard) | GB/T 4348.3-2002 | | Quoted Standard | GB/T 603; GB/T 6682 | | Regulation (derived from) | National Standards Bulletin No. 41 of 2012 | | 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 the 1, 10 phenanthroline spectrophotometric determination of iron content in sodium hydroxide for industrial use methods. This standard applies to the iron content greater than or equal to 0. 000 05% (mass fraction) of industrial p | GB/T 4348.3-2012: Sodium hydroxide for industrial use - Determination of iron content. 1, 10-phenanthroline photometric 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.
ICS71.060.40
G11
National Standards of People's Republic of China
Replacing GB/T 4348.3-2002
Hydroxide for industrial use
Determination of iron content - 1,10-phenanthroline spectrophotometry
Issued on. 2013-08-01 2012-12-31 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard rule according to GB/T 1.1-2009 given draft.
This standard replaces GB/T 4348.3-2002 "industrial use - Determination of iron content of sodium hydroxide 1,10 phenanthroline spectrophotometry", and
GB/T 4348.3-2002 compared to the main technical changes are as follows.
--- Modify the normative references (see Chapter 2, Section 2 of the 2002 edition);
--- Reduced to Fe2 Fe3 modified with a reducing agent (see 3, 6.1.1, and 64, 2002, edition of 3, 6.1.1 and 6.3.3.);
--- Modified Reagents (see Chapter 4, Chapter 4 of the 2002 edition);
--- Modify the standard color solution formulation (see 611, 2002 edition of 6.1.1.);
--- Modified adjusted zero spectrophotometer with a solution (see 6.1.2 and 65, 2002 edition of 6.1.2 and 6.3.4.);
--- Modify the sample size (see 62, 2002 version 6.2.);
--- Modify the result of the calculation formula (see Chapter 7, Chapter 7, 2002 edition);
--- Increasing the test report chapter (see Chapter 9).
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. Shandong Dadi Salt Group Co., Ltd., Fujian Meizhou Bay Chlor-Alkali Industry Co., Jinxi Chemical Industry Research Institute, should
Bin Tianyuan Group Co., Ltd.
The main drafters of this standard. Chenpei Yun, Sun Wenyong, Yenai Yi, Liu Xing, Li Furong, Hu Liming, Tianyou Li.
This standard previously issued as follows.
--- GB/T 4348.3-1984, GB/T 4348.3-2002.
Hydroxide for industrial use
Determination of iron content - 1,10-phenanthroline spectrophotometry
Warning. Some products and reagents used in this test method analyzed corrosive, care should be taken, such as contact with skin!
On should immediately wash with water, severe cases should seek medical attention immediately.
1 Scope
This standard specifies the 1,10-phenanthroline spectrophotometry method hydroxide for industrial use in the iron content.
This standard applies to iron content greater than or equal to 0.00005% (mass fraction) of industrial products with sodium hydroxide.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated edition applies to this article
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 603 Test Methods Chemicals Preparations with
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
Principle 3
Ascorbic acid in the sample solution is reduced to Fe3 Fe2, at a pH of from 4 to 6.00, Fe2 with 1,10-phenanthroline generated orange red envelope
. Compound Maximum absorption wavelength in a spectrophotometer (510nm) absorbance was measured at a reaction formula is as follows.
2Fe3 C6H8O → 6 2Fe2 C6H6O6 2H
Fe2 3C12H8N → 2 [Fe (C12H8N2) 3] 2
4 Reagents and materials
The method of the reagents and water, did not indicate when the other requirements, refer to the three water analytical reagent and GB/T 6682 stipulated.
Standard test solution required, the formulations and products, in addition to the provisions of this standard, according to GB/T 603 regulations prepared.
4.1 hydrochloric acid.
4.2 ammonia.
4.3 hydrochloric acid solution. 13.
4.4 ammonia solution. 19.
4.5 ascorbic acid solution. 10g/L.
The solution can not be used after one week.
Acetic acid 4.6 sodium acetate buffer solution. pH = 4.5.
Weigh 164g of anhydrous sodium acetate (CH3COONa), dissolved in 500 mL of water, add 240 mL of glacial acetic acid, diluted with water
To 1000mL.
4.7 iron standard solution. 0.200mg/mL.
Weigh 1.727g Ammonium Ferric Sulfate [NH4Fe (SO4) 2 · 12H2O], accurate to 0.001g, dissolved in about 200mL of water, add
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