GB/T 33948.1-2017 (GB/T33948.1-2017, GBT 33948.1-2017, GBT33948.1-2017) & related versions
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Method for chemical analysis of copper-steel composite metal -- Part 1: Determination of copper content -- Iodine titration method
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GB/T 33948.1-2017
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GBT 33948.1-2017
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GB/T 33948.1-2017: PDF in English (GBT 33948.1-2017)
GB/T 33948.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.30
H 13
Method for chemical analysis of copper-steel
composite metal - Part 1. Determination of copper
content - Iodine titration method
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Method summary ... 4
3 Reagents ... 4
4 Specimen ... 6
5 Analysis steps ... 7
6 Calculation of analysis results ... 8
7 Precision... 8
8 Test report ... 9
Method for chemical analysis of copper-steel
composite metal - Part 1. Determination of copper
content - Iodine titration method
1 Scope
This Part of GB/T 33948 specified the determination method of copper content
in copper-steel composite metal.
This Part applies to the determination of copper content in copper-steel
composite metal. The determination range is 4.00% ~ 25%.
2 Method summary
Sample is dissolved with nitric acid. The pH of the control solution is 3~4. Mask
iron with ammonium bifluoride. Add potassium iodide and react with bivalent
copper. Iodine precipitated uses starch as indicator. Titrate with sodium
thiosulfate standard titration solution until the light blue solution fades. Calculate
copper content based on the volume of consumed sodium thiosulfate standard
solution.
3 Reagents
Unless otherwise stated, only analytically pure reagents and distilled or
deionized water or equivalent water are used in the analysis.
3.1 Nitric acid (1+1).
3.2 Hydrochloric acid (7+3).
3.3 Hydrogen peroxide (ρ=1.11 g/mL).
3.4 Ammonia (1+1).
3.5 Glacial acetic acid (1+4).
3.6 Potassium iodide solution (200 g/L).
3.7 Iodine solution (0.4 g/L). weigh 0.04 g of iodine in 400mL beaker; add
water to 100 mL and mix well; pour into a brown grounded bottle.
5 Analysis steps
5.1 Test material
Weigh 0.200 g of specimen (Clause 4), to the nearest of 0.0001 g.
5.2 Number of determinations
Perform two determinations independently. Take the average value.
5.3 Blank test
Perform the blank test with test materials.
5.4 Determination
5.4.1 Place the test material (5.1) in a 500-mL conical beaker. Add a small
amount of water to wet. Add 10 mL of nitric acid (3.1). Cover the dish. Perform
complete dissolution at low temperature (solution is transparent without
impurities). If the test material is not completely dissolved, add 5 mL of
hydrochloric acid (3.2). Add 3 mL of hydrogen peroxide (3.3) in 3 portions
(shake for a moment for each adding) till the test material is completely
dissolved (solution is transparent without impurities). Slowly concentrate the
volume to 2 mL at low temperature.
NOTE. Known substrates before dissolution contain manganese, chromium, silicon,
nickel. The test material (5.1) can be placed in a 500 mL conical beaker. Add 5 mL of
hydrochloric acid (3.2) at low temperature. Hydrogen peroxide is added dropwise in 5
portions (3.3), 2 mL for each (shake for a moment for each adding) till the test material is
completely dissolved (solution is transparent without impurities). Add 10 mL of nitric acid
(3.1). Cover the dish. Slowly concentrate volume to 2 mL at low temperature.
5.4.2 Remove for cooling. Wash dish and glass wall with water (up to 5 mL in
volume). Boil. Remove for cooling to room temperature. Ammonia (3.4) is
added dropwise until iron precipitation is complete (solution is viscous). Add
ammonium bifluoride saturated solution (3.9) until red color disappears and it
exceeds by 2 mL. Wash the watch glass and glass wall with water. Shake well.
5.4.3 Add 10 mL of potassium iodide solution (3.6). Shake well and dissolve.
Immediately titrate with sodium thiosulfate standard titration solution (3.13).
When the solution is light yellow, add 5 mL of starch solution (3.10). Continue
titration with sodium thiosulfate standard titration solution (3.13) until the
solution is light blue. Add 2 mL of potassium thiocyanate solution (3.11). Shake
well to deepen blue. Continue titration with sodium thiosulfate standard titration
solution (3.13) until the solution fades to blue.
......
| Standard ID | GB/T 33948.1-2017 (GB/T33948.1-2017) | | Description (Translated English) | Method for chemical analysis of copper-steel composite metal -- Part 1: Determination of copper content -- Iodine titration method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H13 | | Classification of International Standard | 77.120.30 | | Word Count Estimation | 6,669 | | Date of Issue | 2017-07-12 | | Date of Implementation | 2018-02-01 | | Drafting Organization | Ningbo Yumeng Copper Band Co., Ltd., Zhongluo Luoyang Copper Co., Ltd., National Copper Lead and Zinc and Products Quality Supervision and Inspection Center, Suzhou Nonferrous Metals Research Institute Co., Ltd., Shaoxing Quality and Technical Supervision and Inspection Institute | | Administrative Organization | National Standardization Technical Committee for Nonferrous Metals (SAC / TC 243) | | Proposing organization | China Nonferrous Metals Industry Association | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee | | Summary | This standard specifies the copper-steel composite copper content determination method. This standard is applicable to the determination of copper content of copper-steel composite metal. Determination of the surrounding: 4.00% ~ 25.00%. |
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