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Determination of melamine in liquefied raw milk for export. Polarography method
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Basic data
| Standard ID | SN/T 3627-2013 (SN/T3627-2013) |
| Description (Translated English) | Determination of melamine in liquefied raw milk for export. Polarography method |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | X16 |
| Classification of International Standard | 67.100.10 |
| Word Count Estimation | 10,186 |
| Regulation (derived from) | National quality recognition (2013), No. 464; industry standard filing Notice No. 1 of 2014 (No. 169 overall) |
| Issuing agency(ies) | General Administration of Customs |
| Summary | This standard specifies the polarographic determination of melamine in raw milk liquid. This standard applies to the determination of melamine in raw milk liquid. |
SN/T 3627-2013: Determination of melamine in liquefied raw milk for export. Polarography method
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Determination of melamine in liquefied raw milk for export. Polarography method
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Determination of export liquid melamine in raw milk
Polarography
Issued on. 2013-08-30
2014-03-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
Accordance with the standards GB/T 1.1-2009, GB/T 20001.4-2001 and rules of SN/T 0001-1995 given draft.
Please note that some of the content of this document may involve patents. Distribution of this document
Institutions do not assume the responsibility to identify 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 Hubei Exit Inspection and Quarantine.
The main drafters of this standard. about Ling Tao, Wang Fan, Cui Hairong, Guo Jian, Ye Cheng, Yang wind, Guo Shaofei.
Determination of export liquid melamine in raw milk
Polarography
1 Scope
This standard specifies the polarographic determination of the liquid melamine in raw milk.
This standard applies to the determination of the liquid melamine in raw milk.
2 Method summary
The introduction of liquid membrane separation technology for raw milk and dairy products has fluidity characteristics, the use of a dialysis membrane selection of melamine molecules
Extracted from the liquid melamine in dairy products through sexual function. Melamine molecule has three amino groups are electrochemically active, when the electrode
Potential when loaded to the scanning anode oxidation in alkaline solution medium can produce a characteristic reduction potential, a characteristic redox potential to set
Resistance, the current peak value to generate quantitative characteristic potentials.
3 Reagents and materials
Unless otherwise specified, the water is distilled water, reagents were of analytical grade.
3.1 sodium hydroxide.
3.2 potassium chloride.
3.3 base solution (4mol/LNaOH-0.4mol/LKCl). Weigh 160.04g of sodium hydroxide (3.1) and 29.82g potassium chloride (3.2), with an appropriate
The amount of water to dissolve, and diluted with water to 1L, shake.
3.4 melamine standard (melamine, CAS number. 108-78-1). purity of greater than or equal to 99.9%.
3.5 Melamine standard stock solution (1000μg/mL). Weigh accurately 100mg (accurate to 0.1mg) melamine standard (3.4)
In 100mL flask, after dissolved in water, dilute to the mark, mix, at 0 ℃ ~ 4 ℃ conditions stored in the dark for a period of one month.
3.6 raw milk or liquid dairy series of standard working solution containing melamine. were added 0mL, 0.20mL, 0.30mL,
0.40mL, 0.50mL melamine standard stock solution (3.5) in five vial with melamine-free raw milk or liquid dairy products
Diluted to 100.00g, shake, to give concentrations of 0mg/kg, 2.0mg/kg, 3.0mg/kg, 4.0mg/kg, 5.0mg/kg cyanuric
Amine series of standard working solution.
4 instruments and equipment
4.1 Melamine rapid extraction apparatus include. sample holder (see Appendix A in Figure A.1 and A.2) and temperature control unit. Wherein the sample holder
Made of a metal stent, the membrane having a plurality of circular holes disposed osmosis device (4.3), and can be placed in the melamine rapid extractor (4.1) in a water bath
Slot. Temperature control unit Temperature requirements. 70 ℃ ± 2 ℃. Or performance are quite.
4.2 membrane dialysis devices. the 3500 molecular weight cellulose acetate dialysis membrane, a dialysis membrane supported by the support frame composed of the outer tube and the cap apparatus shown
See Appendix A in Figure A.3 and A.4. Or performance are quite.
4.3 Polarograph. with the dropping mercury electrode, a platinum electrode, Ag/AgCl electrode three-electrode system, with a special plastic sample cup, or rather by the performance.
4.4 Analysis of balance. a sense of volume and 0.0001g 0.01g.
4.5 Pipette. 1mL, 5mL.
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