GB/T 7731.2-2007 English PDF

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GB/T 7731.2-2007: Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method
Status: Valid

GB/T 7731.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7731.2-2007	209	Add to Cart	3 days	Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method	Valid
GB/T 7731.2-1987	199	Add to Cart	2 days	Methods for chemical analysis of ferrotungsten--The sodium periodate photometric method for the determination of manganese content	Obsolete

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Basic data

Standard ID: GB/T 7731.2-2007 (GB/T7731.2-2007)
Description (Translated English): Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 8,811
Date of Issue: 2007-09-11
Date of Implementation: 2008-02-01
Older Standard (superseded by this standard): GB/T 7731.16-1999; GB/T 7731.2-1987
Quoted Standard: GB/T 4010
Regulation (derived from): National Standard Approval Announcement 2007 No.11 (Total No.111)
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 determination of manganese content-periodate spectrophotometric and flame atomic absorption spectrometry. This section applies to the determination of tungsten iron and manganese content, including periodate spectrophotometric and flame atomic absorption spectrometry. Measured Warning-this part of the staff should use the practical experience of formal laboratory work. This section does not indicate that all possible safety problems. Users are responsible for taking appropriate safety and health practices and to ensure compliance with the relevant national regulations. Given range (mass fraction): 0. 05% to 0. 70 %.

GB/T 7731.2-2007: Ferrotungsten -- Determination of manganese content -- The periodate spectrophotometric method and the flame atomic absorption spectrometric 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.
Ferrotungsten. Determination of manganese content. The periodate spectrophotometric method and the flame atomic absorption spectrometric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 7731.2-1987, GB/T 7731.16-1999 Determination of tungsten content of Fe, Mn Periodate spectrophotometry and Flame Atomic Absorption Spectrometry Posted 2007-09-11 2008-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This section GB/T 7731 instead of GB/T 7731.2-1987 "spectrophotometric determination of tungsten chemical analysis of iron and manganese, sodium periodate amount" And GB/T 7731.16-1999 "Methods for chemical analysis of tungsten iron flame atomic absorption spectrometric method for the determination of manganese content." This portion of the GB/T 7731.2-1987 and GB/T 7731.16-1999 comparison, in addition to editorial changes, the right GB/T 7731.2-1987 mainly for the following technical modifications. --- The measuring range of less than 0.50%, - 0.70% to 0.05%; --- Dissolving the nitric acid - hydrofluoric acid decomposition, sulfuric smoke flooding fluorine instead of oxalic acid - hydrogen peroxide decomposition; --- Chromogenic assay medium by a single phosphate to parathion mixed acid medium; --- Oxidising agent instead of sodium periodate and potassium periodate or sodium periodate; --- By the 530nm wavelength was measured to 525nm. This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This section is drafted. Sichuan Investment Emei Ferroalloy (Group) Co., Ltd. The main drafters of this section. should Tang Hua, Fang Yan, Wang Yuan. This part of the standard replaces the previous editions are. --- GB/T 7731.2-1987; --- GB/T 7731.16-1999. Determination of tungsten content of Fe, Mn Periodate spectrophotometry and Flame Atomic Absorption Spectrometry Warning --- Use this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

GB/T 7731 provisions of this part of the determination of manganese content by periodate spectrophotometric method and the flame atomic absorption spectrometry. This section applies to the determination of tungsten content of iron and manganese, including periodate spectrophotometric method and the flame atomic absorption spectrometry. Measurement range (Mass fraction). 0.05% to 0.70%.

2 Normative references

The following documents contain provisions which, through reference to GB/T 7731 to the present, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 4010 alloy chemical analysis and preparation of samples 3 Method One. periodate spectrophotometry 3.1 Principle Sample with oxalic acid - hydrogen peroxide decomposition, to get rid of phosphoric acid micro smoke and hydrogen peroxide. In dilute phosphoric acid medium, or high potassium iodate Sodium periodate oxidation of manganese to permanganate, 525nm wavelength measured absorbance on a spectrophotometer. 3.2 Reagents and materials Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water. 3.2.1 High potassium iodate (or sodium periodate), a solid. 3.2.2 oxalic acid, solid. 3.2.3 hydrogen peroxide, ρ1.10g/mL. 3.2.4 phosphoric acid, ρ1.70g/mL. 3.2.5 does not contain water reducing substance. in 1000mL of water were added 20mL sulfuric acid (1 + 1), under the micro-boiling state adding a small amount (about 2g) and potassium periodate or sodium periodate (3.2.1), and held for about 10min. Cooling spare. 3.2.6 Manganese standard solution. Weigh 0.1000g Jinzhumeng [mass fraction is greater than 99.9%, pre-washed to remove surface oxides in sulfuric acid (5 + 95), remove, Now clean, washed with water, and washed 2 or 3 times with ethanol, and air-dried to use] placed in 300mL beaker, add 20mL Hydrochloric acid (1 + 1), 20 mL of sulfuric acid (1 + 1), dissolved by heating, and evaporated to take the drive out white smoke of sulfuric acid, hydrochloric acid, cooled to room temperature. Moved to 1000mL Volumetric flask, dilute with water to volume, and mix. This solution 1mL manganese 100μg. 3.3 Instrument Analysis using common laboratory instruments. 3.4 Sampling and Preparation In accordance with the provisions of GB/T 4010 will be sampling and sample preparation. Specimens shall be by 0.088mm sieve. ......

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