SN/T 2072-2008 English PDF

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SN/T 2072-2008: Determination of tetradifon residues in tea for import and export
Status: Valid

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SN/T 2072-2008	339	Add to Cart	3 days	Determination of tetradifon residues in tea for import and export	Valid

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Basic data

Standard ID: SN/T 2072-2008 (SN/T2072-2008)
Description (Translated English): Determination of tetradifon residues in tea for import and export
Sector / Industry: Commodity Inspection Standard (Recommended)
Classification of Chinese Standard: X55
Word Count Estimation: 13,131
Date of Issue: 2008-04-29
Date of Implementation: 2008-11-01
Regulation (derived from): Industry standard filing Notice 2008 No. 7
Issuing agency(ies): General Administration of Customs
Summary: This standard specifies the tea Tetradifon Residual gas chromatographic method. This standard applies to tea Tetradifon residues.

SN/T 2072-2008: Determination of tetradifon residues in tea 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 tetradifon residues in tea for import and export Exit inspection and quarantine industry standard book People's Republic of China Import and export tea tetradifon Determination of residues Posted 2008-04-29 2008-11-01 implementation People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine released

Foreword

Appendix A of this standard is an informative annex. This standard is proposed and managed by the National Certification and Accreditation Administration Committee. This standard was drafted. People's Republic of China Hunan Exit Inspection and Quarantine. The main drafters of this standard. Yanhong Fei, Zhang Ying, Huang Ping, Tang Lianfei, OF SCIENTIFIC Zhiqiang. This standard is the first release of the entry-exit inspection and quarantine industry standards. Import and export tea tetradifon Determination of residues

1 Scope

This standard specifies the gas chromatographic method tetradifon residues in tea. This standard applies to the determination of tetradifon residues in tea.

2 Method summary

Pulverized tea samples after water immersion, with acetone and n-hexane mixture to extract a sample of tetradifon, the extract over Activated Carbon Phase extraction column purification, concentrated volume, using a gas chromatograph equipped with electron capture detector (ECD) were measured, quantified by external standard.

3 Reagents and materials

Unless otherwise specified, all reagents were of analytical grade, water is distilled water. 3.1 hexane. pure class distinctions. 3.2 acetone. pure class distinctions. 3.3 anhydrous sodium sulfate. After burning 650 ℃ 4h, cooled in a desiccator to room temperature and stored in a sealed bottle aside. 3.4 acetone - hexane mixture (1 + 9, by volume). n-hexane depicting 90mL (3.1) with 10mL acetone (3.2) were mixed uniformly. 3.5 tetradifon standard substance (Tetradifon, C12H6Cl4O2S, CASN O. 116-29-0). not less than 99% purity. 3.6 tetradifon standard stock solution. accurately weighed amount of reference material tetradifon with acetone formulated as 100mg/L standard Quasi stock solution and then diluted with n-hexane according to testing requirements to the corresponding standard working solution in the dark at 4 ℃. 3.7 activated carbon SPE column. 3mL, 250mg, or equivalent person.

4 instruments and equipment

4.1 Gas chromatograph equipped with electron capture detector (ECD). 4.2 mill. 4.3 Vortex device. 4.4 Multifunction trace of sample processing instrument, or equivalent person. 4.5 Centrifuge. 3000r/min.

5 Sample Preparation and Storage

5.1 Sample Preparation Take a representative sample 500g, crushed with a grinder and sieve through a 2.0mm hole. Mixing, are divided into two as a sample, dispense into Sheng sample in a clean container, and sealed and labeled. 5.2 Sample preservation At 0 ℃ ~ 4 ℃ The sample was preserved. In the sample preparation procedure, it should prevent sample contamination or the occurrence of the change of residue content. ......

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