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GB/T 11886-2015: Silver jewellery alloys -- Determination of sliver -- Volhard method
Status: Valid GB/T 11886: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 11886-2015 | English | 129 |
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Silver jewellery alloys -- Determination of sliver -- Volhard method
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GB/T 11886-2015
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| GB/T 11886-2001 | English | 199 |
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Chemical analysis -- Method of silver content in jewellery
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GB/T 11886-2001
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| GB/T 11886-1989 | English | RFQ |
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Chemical analysis--Method of silver content in jewellery
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GB/T 11886-1989
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PDF similar to GB/T 11886-2015
Standard similar to GB/T 11886-2015 GB 19593 GB/T 18043 GB 11887 GB/T 11888 Basic data | Standard ID | GB/T 11886-2015 (GB/T11886-2015) | | Description (Translated English) | Silver jewellery alloys -- Determination of sliver -- Volhard method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y88 | | Classification of International Standard | 39.060 | | Word Count Estimation | 6,628 | | Date of Issue | 2015-06-02 | | Date of Implementation | 2016-01-01 | | Older Standard (superseded by this standard) | GB/T 11886-2001 | | Quoted Standard | GB/T 17832; GB/T 18996 | | Regulation (derived from) | National Standard Announcement 2015 No.19 | | 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 method using V Earhart silver alloy jewelry in silver content. This Standard applies to the silver content of 700 �� ~ 995 �� silver alloy jewelry, when the titration end point is not easy to break, it recommended GB/T 17832 or GB/T 18996 Determination. | GB/T 11886-2015: Silver jewellery alloys -- Determination of sliver -- Volhard 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.
Silver jewellery alloys. Determination of sliver. Volhard method
ICS 39.060
Y88
National Standards of People's Republic of China
Replacing GB/T 11886-2001
Determination of silver content of the silver alloy jewelry
V Earhart law
Issued on. 2015-06-02
2016-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard replaces GB/T 11886-2001 "jewelry silver content Methods for chemical analysis."
This standard compared with GB/T 11886-2001, the main technical changes are as follows.
--- Standard names and structures according to GB/T 1.1-2009 requirements be modified.
--- Prepared to modify the standard in accordance with GB/T 1.1-2009 and GB/T 20001.4-2001 requirements.
--- By the scope of this standard, "80.0% to 99.5%" adjusted "700 ‰ ~ 995 ‰", and the table and the scope of the calculation results
Modify as shown per mille, and GB 11887 "jewelry precious metal purity and designation" means way to keep
Consistent.
--- The calibration standard solution of potassium thiocyanate adjustment from Chapter 4 to Chapter 6, make the structure more clear and reasonable standard.
--- Modify the representation of the results of Chapter 7, and added, "The results to reserved bits" requirements.
--- Increase the content and requirements of Chapter 8 lab report.
The standard proposed by China National Light Industry Council.
This standard by the National Standardization Technical Committee jewelry (SAC/TC256) centralized.
This standard was drafted. National Jewelry Quality Supervision and Inspection Center, Beijing Jewelry Quality Supervision and Inspection Station.
The main drafters of this standard. Li Kun, Lisu Qing, Wang Jinlong, Zhao Chao, Liu Yufeng, Wang Jian, ZHANG Dai, Zhang Hongyan.
This standard superseded standard previously issued as follows.
--- GB/T 11886-1989, GB/T 11886-2001.
Determination of silver content of the silver alloy jewelry
V Earhart law
1 Scope
This standard specifies the method determined by volt Earhart silver alloy jewelry in silver content.
This standard applies to the silver content of 700 ‰ ~ 995 ‰ silver alloy jewelry, not easy to determine when the end point of titration is recommended GB/T 17832 or
GB/T 18996 Determination
Note. When the silver content of the sample exceeds the scope of this standard, recommended GB/T 17832 or GB/T 18996 for testing.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 17832 silver jewelery alloys - Determination of silver content of potassium bromide volumetric method (potentiometric titration)
GB/T 18996 silver jewelery alloys - Determination of silver content sodium or potassium chloride volumetric method (potentiometric titration)
3 PRINCIPLE OF THE METHOD
The sample was dissolved in nitric acid to ammonium ferric sulfate as an indicator was titrated with a standard solution of potassium thiocyanate. First and thiocyanate solution
Silver ions react insoluble precipitate silver thiocyanate, silver ions when precipitation was complete, the excess drop of thiocyanate and ferric ion trans
Should generate red ferric thiocyanate complexes, is the end.
4 reagent material
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
Nitric acid 4.1 mass fraction of 65%, ρ = 1.40g/mL, no chlorine ions.
Sulfuric acid 4.2 mass fraction of 98%, ρ = 1.84g/mL, no chlorine ions.
4.3 nitric acid (12).
4.4 mixed acid, nitric acid (4.1) sulfate (4.2) = 51.
4.5 potassium thiocyanate standard titration solution, pharmaceutical balance (5.3), potassium thiocyanate weighed 45.5g, placed in 250mL beaker, add the right amount of steam
After the distilled water to dissolve the reagent bottle transferred to a 5L, plus distilled water diluted to 5L, shake well and let stand for 3 days.
4.6 ammonium ferric sulfate indicator, pharmaceutical balance (5.3) weigh ammonium ferric sulfate 5.0g, placed in 250mL beaker, adding an appropriate amount of distilled water to make
It becomes saturated solution. Solution of nitric acid to brown then disappear, diluted with distilled water to 50mL, shake.
4.7 standard silver, purity 999.9 ‰ or more.
5 Equipment
Common laboratory equipment and
5.1 electronic balance, a sense of the amount of 0.01mg, accuracy class three.
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