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GB/T 5121.18-2008: Methods for chemical analysis of copper and copper alloys -- Part 18: Determination of magnesium content
Status: Valid GB/T 5121.18: Evolution and historical versions
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| GB/T 5121.18-2008 | English | 169 |
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Methods for chemical analysis of copper and copper alloys -- Part 18: Determination of magnesium content
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GB/T 5121.18-2008
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| GB/T 5121.18-1996 | English | 239 |
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Copper and copper alloys--Determination of magnesium content
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GB/T 5121.18-1996
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PDF similar to GB/T 5121.18-2008
Basic data | Standard ID | GB/T 5121.18-2008 (GB/T5121.18-2008) | | Description (Translated English) | Methods for chemical analysis of copper and copper alloys -- Part 18: Determination of magnesium content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H13 | | Classification of International Standard | 77.120.30 | | Word Count Estimation | 7,797 | | Date of Issue | 2008-06-17 | | Date of Implementation | 2008-12-01 | | Older Standard (superseded by this standard) | GB/T 5121.18-1996 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.10 (Total No.123) | | Issuing agency(ies)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 method for determination of copper and copper alloy magnesium content. This section applies to the determination of copper and copper alloy magnesium content. Measuring range: 0. 015% to 1. 00%. | GB/T 5121.18-2008: Methods for chemical analysis of copper and copper alloys -- Part 18: Determination of magnesium content
---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.
Methods for chemical analysis of copper and copper alloys Part 18. Determination of magnesium content
ICS 77.120.30
H13
National Standards of People's Republic of China
Replacing GB/T 5121.18-1996
Copper and copper alloys -
Part 18. Determination of magnesium content
Posted 2008-06-17
2008-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 5121 "Copper and copper alloy chemical analysis method" a total of 27 sections.
--- Part 1. Determination of copper content;
--- Part 2. Determination of phosphorus content;
--- Part 3. Determination of lead content;
--- Part 4. Carbon, Determination of sulfur content;
--- Part 5. Determination of nickel content;
--- Part 6. Determination of bismuth content;
--- Part 7. Determination of arsenic content;
--- Part 8. Determination of oxygen content;
--- Part 9. Determination of iron content;
--- Part 10. Determination of tin content;
--- Part 11. Determination of zinc content;
--- Part 12. Determination of antimony content;
--- Part 13. Determination of aluminum content;
--- Part 14. Determination of manganese content;
--- Part 15. Determination of cobalt content;
--- Part 16. Determination of chromium content;
--- Part 17. Determination of beryllium content;
--- Part 18. Determination of magnesium content;
--- Part 19. Determination of silver content;
--- Part 20. Determination of zirconium content;
--- Part 21. Determination of titanium content;
--- Part 22. Determination of cadmium content;
--- Part 23. Determination of silicon content;
--- Part 24. selenium, tellurium content was measured;
--- Part 25. Determination of boron content;
--- Part 26. Determination of mercury content;
--- Part 27. Inductively coupled plasma atomic emission spectrometry.
This is Part 18.
This Part replaces GB/T 5121.18-1996 "Copper and copper alloys - Determination of magnesium content."
This section compared with the GB/T 5121.18-1996, the main changes are as follows.
--- Omitted "reference standard" one;
--- Original standard text format has been revised;
--- Supplementary terms of quality assurance and control, increasing the precision of the terms.
This part is proposed by the China Nonferrous Metals Industry Association.
The non-ferrous metal part by the National Standardization Technical Committee.
This section Chinalco Luoyang Copper Co., Ltd., Beijing General Research Institute of Mining and Metallurgy, China Nonferrous Metals Industry is responsible Institute of Standards Metrology and Quality
Drafted.
This section Central aluminum Shenyang Nonferrous Metals Processing Co. drafted.
The northwest part of Gansu Copper Co., Ltd., Chinalco Luoyang Copper Co., Ltd. participated in the drafting.
The main drafters of this section. Li Yamin, Liu Yan, Liu Xia, Sun Aiping.
This part certifier. Zhao Yi, Xie Liyun, Liu Jianming, a good mountain peaks.
This part of the standard replaces the previous editions are.
--- GB/T 5121.18-1996.
Copper and copper alloys -
Part 18. Determination of magnesium content
1 Scope
This section specifies the determination of copper and copper alloy magnesium content.
This section applies to the determination of copper and copper alloy magnesium content. Measurement range. 0.015% to 1.00%.
2 Method summary
The sample is dissolved in nitric acid and hydrofluoric acid. In nitric acid medium, using air - acetylene flame atomic absorption spectrometer wavelength 285.2nm
Measured absorbance magnesium. Silicon, aluminum, titanium and beryllium interference, adding strontium nitrate eliminate; other coexisting elements copper, nickel, lead and zinc do not interfere
Determination.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
3.1 Hydrofluoric acid (ρ1.13g/mL).
3.2 nitric acid (1 + 1).
3.3 boric acid solution (30g/L).
3.4 Strontium nitrate solution (25g/L).
3.5 Magnesium standard stock solution. Weigh 0.1000g of pure magnesium (Mg content ≥99.95%) placed in 150mL beaker, add 10mL
Nitric acid (3.2), dissolved by heating, removal of nitrogen oxides was boiled and cooled. Moved into 1000mL volumetric flask, dilute with water to volume, and mix.
This solution 1mL containing 100μg magnesium.
3.6 Magnesium standard solution. Pipette 10.00mL magnesium standard stock solution (3.5) into 100mL volumetric flask, dilute to the mark with water, mix
uniform. This solution 1mL containing 10μg magnesium.
4 Instrument
Atomic absorption spectrometer, with a magnesium hollow cathode lamp.
Under optimum working conditions for those who can reach the following indicators can be used.
--- Sensitivity. consistent with the measurement solution matrix solution features magnesium concentration should not exceed 0.01μg/mL;
--- Precision. measuring the absorbance of the standard solution 10 times the highest concentration, the standard deviation does not exceed 1.0% of the mean absorbance; with
The lowest concentration standard solution (not a "zero" standard solution) absorbance measured 10 times, and the standard deviation should not exceed the maximum standard solution
0.5% was the average absorbance;
--- Linear curve. the curve according to concentration, divided into five sections, the difference between the absorbance of the absorbance difference between the highest and the lowest segment segment
Ratio should not be less than 0.7.
5 Sample
Thickness of less than 1mm debris.
Step 6 Analysis
6.1 Sample
Table 1. Weigh the sample (5), accurate to 0.0001g.
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