SN/T 0704-2015 English PDFSN/T 0704: Historical versions
Basic dataStandard 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59.140.01 Word Count Estimation: 7,755 Date of Issue: 2015-02-09 Date of Implementation: 2015-09-01 Older Standard (superseded by this standard): SN 0704-1997 Quoted Standard: GB/T 6682; GB/T 9721; QB/T 2706 Regulation (derived from): State-Quality-Inspection-Accreditation [2015] 59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 ForewordThis 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 Spectrophotometry1 ScopeThis 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 referencesThe 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 sites3 Method summaryFor 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 ReagentsUnless 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. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of SN/T 0704-2015_English be delivered?Answer: Upon your order, we will start to translate SN/T 0704-2015_English as soon as possible, and keep you informed of the progress. The lead time is typically in 9 seconds (download/delivered in 9 seconds). The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of SN/T 0704-2015_English with my colleagues?Answer: Yes. The purchased PDF of SN/T 0704-2015_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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