SN/T 0704: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 0704-2015 | English | 279 |
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Determination of chromium (Ⅵ) in leather and leather product of import and export. Spectrophotometric method
| Obsolete |
SN/T 0704-2015
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| SN 0704-1997 | English | 519 |
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Method for the determination of chromium (VI) in leather gloves for export. Spectrophotometry
| Obsolete |
SN 0704-1997
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PDF similar to SN/T 0704-2015
Standard similar to SN/T 0704-2015 QB/T 1618 QB/T 1333 HJ 569 SN/T 0076 Basic data | Standard ID | SN/T 0704-2015 (SN/T0704-2015) | | Description (Translated English) | Determination of chromium (��) in leather and leather product of import and export. Spectrophotometric method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | Y48 | | Classification of International Standard | 59.140.01 | | Word Count Estimation | 7,755 | | Date of Issue | 2015-02-09 | | Date of Implementation | 2015-09-01 | | Older Standard (superseded by this standard) | SN 0704-1997 | | Quoted Standard | GB/T 6682; GB/T 9721; QB/T 2706 | | Regulation (derived from) | State-Quality-Inspection-Accreditation [2015] 59 | | Issuing agency(ies) | General Administration of Customs | | Summary | This standard specifies the method for determination of leather and leather products in the import and export of hexavalent chromium. This standard applies to the import and export of leather and related products, spectrophotometry lower limit of 1.0 mg/kg. | SN/T 0704-2015: Determination of chromium (Ⅵ) in leather and leather product of import and export. Spectrophotometric 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.
(Import and export of leather and leather products hexavalent chromium spectrophotometry)
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Instead of the SN/T 0704-1997
Determination of the import and export of leather and leather products hexavalent chromium
Determinationofchromium (Ⅵ) inleatherandleatherproductofimportand
Issued on. 2015-02-09
2015-09-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
Instead of the standard SN/T 0704-1997 "export leather gloves chromium (Ⅵ) test spectrophotometry", and SN/T 0704-1997 phase
Ratio, in addition to editorial changes outside the main technical changes are as follows.
--- To expand the scope of the import and export of leather and leather products;
--- Increased at 80 ℃, relative humidity of 20% aging pretreatment 24h;
--- Sample weighed amount to 2g, accurate to 0.001g;
--- Phosphate buffer was added to presorted air leading tube insertion after adding sample bottle, passed into oxygen free argon 5min, Flow
The amount of (50 ± 10) mL/min;
--- Test the extract volume to 10mL, set the volume to volume 25mL, Diphenylcarbazide solution and phosphoric acid solution volume change
As 0.5mL.
Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. People's Republic of China Fujian Entry-Exit Inspection and Quarantine Shandong People's Republic of China
Bureau, People's Republic of China Sichuan Exit Inspection and Quarantine.
The main drafters of this standard. Dai Jinlan, Yin Honglei, Li Xiaojing, Chenxue Can, Chen Shaohua, Chen Min real, Wu Mengru, Yu Lingyun.
This standard replaces the standards previously issued as follows.
--- SN/T 0704-1997.
Determination of the import and export of leather and leather products hexavalent chromium
Spectrophotometry
1 Scope
This standard specifies the method for determination of leather and leather products in the import and export of hexavalent chromium.
This standard applies to the import and export of leather and related products, spectrophotometry lower limit of 1.0mg/kg.
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.
Laboratory use specifications and test methods GB/T 6682 Analysis
GB/T 9721 Chemicals General molecular absorption spectrophotometry (UV and visible part)
QB/T 2706 leather chemical, physical, mechanical and color fastness test sample sites
3 Method summary
For the import and export of leather and leather products according to different requirements, it is determined whether to join the leather aging pretreatment process. Leather aging pretreatment
Process is simulated leather and leather products in the long-distance transport conditions during transport, the test leather and leather products, after a long-distance transport
Leather hexavalent chromium. With pH7.5 ~ 8.0 phosphate buffer and extracted soluble hexavalent chromium in a sample, when desired, solid phase extraction
Removal of the test substance interference. The filtrate under acidic conditions to 1,5 Diphenylcarbazide reaction of purple complex with a spectrophotometer
Determination of the degree at 540nm.
4 Reagents
Unless otherwise indicated, the reagents used were of analytical grade, water as a secondary water GB/T 6682 regulations.
4.1 dipotassium hydrogen.
4.2 1,5 Diphenylcarbazide.
4.3 phosphoric acid (ρ = 1.71g/mL).
4.4 Potassium dichromate reference material. at (102 ± 2) and dried (16 ± 2) h ℃.
4.5 acetone.
4.6 glacial acetic acid.
Dipotassium hydrogen phosphate 4.7 extract (0.1mol/L). 17.4g dipotassium hydrogen (molecular weight 174) were dissolved in distilled 1000mL
Water, neutralized with phosphoric acid (4.3) and the pH was adjusted to 8.0 ± 0.1, and then nitrogen gas or argon gas.
4.8 1,5 Diphenylcarbazide solution. Weigh 1.0g1,5- Diphenylcarbazide (4.2), was dissolved in 100mL acetone (4.5), add a drop of ice B
Acid (4.6), making it acidic.
Note. already with a good 1,5 Diphenylcarbazide solution should be stored in a brown bottle and stored at 4 ℃ shading, valid for 14 days. Solution appears obvious discoloration (especially powder
Red) can no longer be used.
4.9 phosphoric acid (70% volume fraction). A 700mL phosphoric acid (4.3) was diluted with distilled water to 1000mL.
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