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GB/T 7731.14-2008: Ferrotungsten -- Determination of lead content -- The polarographic method and inductively coupled plasma-atomic emission spectrometry
Status: Valid GB/T 7731.14: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7731.14-2008 | English | 259 |
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Ferrotungsten -- Determination of lead content -- The polarographic method and inductively coupled plasma-atomic emission spectrometry
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GB/T 7731.14-2008
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| GB/T 7731.14-1988 | English | 199 |
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Methods for chemical analysis of ferrotungsten--The polarographic method for the determination of lead content
| Obsolete |
GB/T 7731.14-1988
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PDF similar to GB/T 7731.14-2008
Basic data | Standard ID | GB/T 7731.14-2008 (GB/T7731.14-2008) | | Description (Translated English) | Ferrotungsten -- Determination of lead content -- The polarographic method and inductively coupled plasma-atomic emission spectrometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 11,182 | | Date of Issue | 2008-05-13 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 7731.14-1988 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total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 the amount of lead ferrotungsten by polarography spectrometry and inductively coupled plasma atomic emission. This section applies to the determination of lead content ferrotungsten. Measuring range (mass fraction): 0. 001% to 0. 12%. Polarographic method for the determination of which the mass fraction of 0. 001% to 0. 05 % lead content, inductively coupled plasma atomic emission spectrometry determination of suitable mass fraction 0. 010% to 0. 12 % lead content. | GB/T 7731.14-2008: Ferrotungsten -- Determination of lead content -- The polarographic method and inductively coupled plasma-atomic emission spectrometry
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Ferrotungsten.Determination of lead content.The polarographic method and inductively coupled plasma-atomic emission spectrometry
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 7731.14-1988
Determination of lead content of tungsten iron polarography
And inductively coupled plasma atomic emission 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 replaces GB/T 7731.14-1988 "Methods for chemical analysis of tungsten iron Polarographic determination of lead content."
This portion of the GB/T 7731.14-1988 comparison, the main changes are as follows.
--- Newly added by inductively coupled plasma atomic emission spectrometry;
--- Standard text format has been revised text.
This section is informative Appendix A Appendix.
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, Liu Huili, Zhangying Xia.
This part of the standard replaces the previous editions are.
GB/T 7731.14-1988.
Determination of lead content of tungsten iron polarography
And inductively coupled plasma atomic emission 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 the amount of lead iron tungstate spectrometry by polarography and inductively coupled plasma atomic emission.
This section applies to the determination of tungsten iron lead content. Measurement range (mass fraction). 0.001% to 0.12%. Where applicable polarography
Determination of the mass fraction of 0.001% to 0.05% lead content; inductively coupled plasma atomic emission spectrometry applied to the mass fraction
Determination of 0.010% to 0.12% lead content.
2 Normative references
The following documents contain provisions which, through reference in this section constitute provisions of this section. For dated references, subsequent
All amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to reach an agreement under this section
Research on whether 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. Polarographic
3.1 Principle
Sample with nitric acid - hydrofluoric acid dissolved perchlorate smoke, adding tartaric acid, pH adjusted with sodium hydroxide and dissolved tungstate. In pH7.5 ~
PH8.0 case, the copper nitrate as the carrier, with thioacetamide precipitation lead to interference separation of elements, and then to iron as the carrier, separated with ammonia
copper. In perchloric acid and phosphoric bottom liquid nitrogen to oxygen, at the peak potential is -0.51V was measured POLAROGRAPHY.
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 nitrate, ρ1.42g/mL.
3.2.3 perchloric acid, ρ1.67g/mL.
3.2.4 hydrochloric acid, 1 + 1.
3.2.5 hydrochloric acid, 1 + 2.
3.2.6 hydrochloric acid - nitric acid mixture, 3 + 1.
3.2.7 phosphoric acid solution, 1mol/L.
3.2.8 ammonia, ρ0.90g/mL.
3.2.9 ammonia, 1 + 2.
3.2.10 ammonia, 1 + 100.
3.2.11 ammonia, 1 + 200.
3.2.12 sodium hydroxide solution, 250g/L, stored in plastic bottles.
3.2.13 copper nitrate solution, 10g/L.
3.2.14 ferric nitrate solution, 1g/L, Weigh 1g of ferric nitrate dissolved in 50mL water, adding 5mL nitric acid, transferred to 1000mL capacity
Bottle, diluted with water to volume, and mix.
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