GB/T 7731.3-2008 English PDF

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GB/T 7731.3-2008: Ferrotungsten -- Determination of copper content -- Bis (cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method
Status: Valid

GB/T 7731.3: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7731.3-2008	189	Add to Cart	3 days	Ferrotungsten -- Determination of copper content -- Bis (cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method	Valid
GB/T 7731.3-1987	199	Add to Cart	2 days	Methods for chemical analysis of ferrotungsten--The bis (cyclohexanone) oxalyldihy drazone photometric method for the determination of copper content	Obsolete

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Basic data

Standard ID: GB/T 7731.3-2008 (GB/T7731.3-2008)
Description (Translated English): Ferrotungsten -- Determination of copper content -- Bis (cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 8,886
Date of Issue: 2008-05-13
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 7731.3-1987; GB/T 7731.15-1999
Quoted Standard: GB/T 4010
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
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 copper content bicyclic cyclohexanone oxalyldihydrazone photometric and flame atomic absorption spectrometry. This section applies to the determination of copper content ferrotungsten. Bicyclic cyclohexanone oxalyldihydrazone spectrophotometric measurement range (mass fraction): 0. 030% ~ 0. 25%, flame atomic absorption spectrometry range (mass fraction): 0. 020% to 0. 25 %.

GB/T 7731.3-2008: Ferrotungsten -- Determination of copper content -- Bis (cyclohexanone) oxalyldihydrazone photometric method and 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 copper content. Bis (cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 7731.3-1987, GB/T 7731.15-1999 Determination of iron and copper tungsten bicyclic cyclohexanone oxalyl dihydrazone Method and the flame atomic absorption spectrometry Posted 2008-05-13 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This part is GB/T 7731.3-1987 "Methods for chemical analysis of tungsten iron bicyclic cyclohexanone oxalic acid bis photometric method for determination of copper content" and GB/T 7731.15-1999 "Methods for chemical analysis of tungsten iron flame atomic absorption spectrometric method for the determination of copper content," the integration of amendments. This Part replaces GB/T 7731.3-1987 and GB/T 7731.15-1999. This portion of the GB/T 7731.3-1987 and GB/T 7731.15-1999 comparison, mainly with the following modifications. --- Measurement range (mass fraction) by the modification ≤0.25% 0.030% - 0.25%; --- Copper content (mass fraction) by the allowable difference of 0.080% 0.008% 0.030% revised to allow deviation of ~ 0.080% 0.008%. 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. Sinosteel Jilin Ferroalloy Co., Ltd. The main drafters of this section. phosphorus, copper Ma Qin, Liu. This part of the standard replaces the previous editions are. --- GB/T 7731.3-1987; --- GB/T 7731.15-1999. Determination of iron and copper tungsten bicyclic cyclohexanone oxalyl dihydrazone Method and the flame atomic absorption spectrometry Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This section specifies the determination of copper content bicyclic cyclohexanone oxalic acid bis photometric and flame atomic absorption spectrometry. This section applies to the determination of copper content of tungsten iron. Bicyclic cyclohexanone oxalic acid bis photometric measurement range (mass fraction). 0.030% ~ 0.25%; flame atomic absorption spectrometry range (mass fraction). 0.020% to 0.25%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether 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 Method 3 a bicyclic cyclohexanone oxalic acid bis photometric 3.1 Principle Sample decomposition with hydrofluoric acid and nitric acid, perchloric acid treated white smoke, water soluble salts dissolved, separated after the majority of tungsten, lemon Acid and ammonium hydroxide to adjust the acidity of the reaction after adding BCO 600nm wavelength measured absorbance, isolated from the calibration curve corresponding The amount of copper. 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 hydrofluoric acid, ρ1.15g/mL. 3.2.2 perchloric acid, ρ1.67g/mL. 3.2.3 nitric acid, 1 + 1. 3.2.4 Ammonium hydroxide, 1 + 1. 3.2.5 iron perchlorate solution. Weigh 0.5g electrolytic iron, placed in 300mL beaker, add 20mL hydrochloric acid (ρ1.19g/mL), cover Table dish, was added dropwise hydrogen peroxide (ρ1.10g/mL) and then decomposed excess 5mL, heated and evaporated to a volume of about 5mL, cooled, diluted with 25mL Hydrochloric acid (10 + 6) to move it to the 200mL separating funnel, add 30mL of methyl isobutyl ketone and shaken for about 1min, standing layer, the lower layer of water Phase shifted original beaker. Was added to the separatory funnel 10mL water, then add 30mL of methyl isobutyl ketone and shaken for about 1min, standing stratification. The aqueous phase shift in the original beaker was discarded and the organic phase, was added 10mL of hydrochloric acid (ρ1.19g/mL), most of the volatile organic phase was heated in a solution, Was added 5mL of nitric acid (ρ1.42g/mL), 20mL of perchloric acid (ρ1.67g/mL), is heated and evaporated to take the white smoke of concentrated perchloric acid, and heating was continued for about 3min to the clear solution was cooled, diluted with water to 100mL, and mix. This solution 1mL containing about 5mg iron. 3.2.6 citric acid solution, 200g/L. 3.2.7 bicyclic oxalyl two cyclohexanone hydrazone (BCO -) solution, 0.5g/L, 0.25gBCO weighed in a beaker, was added 20mL of methanol and several Ml of water, with a glass rod side crushed BCO dissolved while heating, cooled to room temperature and transferred to 500mL volumetric flask, dilute to the mark with water, mix ......

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