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| SN/T 1904-2007 | English | 359 |
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Determination of formaldehyde content in leather for import and export
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SN/T 1904-2007
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Basic data | Standard ID | SN/T 1904-2007 (SN/T1904-2007) | | Description (Translated English) | Determination of formaldehyde content in leather for import and export | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | Y45 | | Classification of International Standard | 59.010 | | Word Count Estimation | 9,981 | | Date of Issue | 2007-05-23 | | Date of Implementation | 2007-12-01 | | Regulation (derived from) | ?National-accreditation-Science (2011) 63 | | Issuing agency(ies) | General Administration of Customs | | Summary | This standard specifies the method for determination of formaldehyde content of imported leather. This standard is used in the determination of the import and export of leather and its products formaldehyde content. | SN/T 1904-2007: Determination of formaldehyde content in leather for import and export---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.
Determination of formaldehyde content in leather for import and export
Exit inspection and quarantine industry standard book People's Republic of China
Determination of formaldehyde content in the import and export of leather
Posted 2007-05-23
2007-12-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
Appendix A of this standard is the data appendix.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. People's Republic of China Fujian Exit Inspection and Quarantine.
The main drafters of this standard. Tongyu Gui Cheng group, Jiang Xiaoli, Wengruo Rong, Liang Ming, Lin Bifen, Zheng Zhiming.
This standard is the first release of the entry-exit inspection and quarantine industry standards.
Determination of formaldehyde content in the import and export of leather
1 Scope
This standard specifies the method for determination of formaldehyde content in the import and export of leather.
This standard applies to the determination of the import and export of leather and its products formaldehyde content.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Preparation of GB/T 601 chemical reagent standard titration solution
3 Reagents
Unless otherwise specified, reagents were of analytical grade, water-cooled boiled 10min ultrapure water.
3.1 formaldehyde solution, 36% to 38%.
3.2 0.05mol/L of iodine (12i2
) Solution. Weigh 6.36g of pure iodine and 20g potassium iodide, first dissolved in a little water, then diluted to
1000mL.
3.3 1mol/L sodium hydroxide solution.
3.4 1mol/L sulfuric acid solution (12H2SO4
).
3.5 0.1000mol/L sodium thiosulfate standard solution. According to GB/T 601 formulation.
3.6 1% starch solution. 1g starch dissolved in 100mL of water, the time is now equipped with.
3.7 formaldehyde standard stock solution preparation and calibration.
Draw 5mL formaldehyde solution (3.1) in 100mL of water containing about 1000mL volumetric flask with water to volume, shake. this
Solution of formaldehyde standard stock solution concentration of about 2mg/mL, built-in refrigerator (2 ℃ ~ 8 ℃) stable for three months.
Imbibe formaldehyde stock solution 10.0mL in 250mL iodometric flask, 50.0mL iodine solution (3.2), 15mL of sodium hydroxide
Solution (3.3), mixing, placing 15min ± 1min room temperature. Then while rotating roll while adding 20mL sulfuric acid solution (3.4), mix, then place
15min. When sodium thiosulfate solution (3.5) titrate drop to pale yellow solution, add 1mL starch solution (3.6) and continue titration
Just fade to blue, write down the amount (Vp 1).
Meanwhile, 10.0mL water instead of formaldehyde stock solution with the method blank test, write down the amount of sodium thiosulfate solution (V0).
The concentration of formaldehyde standard stock solution (mg/mL), according to equation (1).
Ba FA =
(Vp Vp 0- 1) × Ba 1 × MFA/2
10.0
(1)
Where.
Ba FA --- formaldehyde standard stock solution concentration, in milligrams per milliliter (mg/mL);
V0 --- blank solution of sodium thiosulfate consumption;
Vp 1 --- sample consumption of sodium thiosulfate solution;
Ba 1 --- sodium thiosulfate solution concentration units per liter (mol/L);
--- The MFA molar mass of formaldehyde, per mole of the unit of 30.08 g (30.08g/mol);
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