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SN/T 0190-2012 English PDF

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SN/T 0190-2012: Determination of ethylenethiourea residues in fruit and vegetable for export. GC-MS method
Status: Valid

SN/T 0190: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
SN/T 0190-2012English419 Add to Cart 3 days [Need to translate] Determination of ethylenethiourea residues in fruit and vegetable for export. GC-MS method Valid SN/T 0190-2012
SN 0190-1993English399 Add to Cart 3 days [Need to translate] Method for determination of ethylenethiourearesidues in fruits for export Obsolete SN 0190-1993

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Basic data

Standard ID SN/T 0190-2012 (SN/T0190-2012)
Description (Translated English) Determination of ethylenethiourea residues in fruit and vegetable for export. GC-MS method
Sector / Industry Commodity Inspection Standard (Recommended)
Classification of Chinese Standard B31
Word Count Estimation 16,146
Older Standard (superseded by this standard) SN/T 0190-1993
Regulation (derived from) National Quality Inspection (2012) 643
Issuing agency(ies) General Administration of Customs
Summary This standard specifies the export of fruit and vegetables ethylene thiourea residues method. This standard applies to fresh orange, chestnut, apple, broccoli, pineapple and other fruits and vegetables ethylene thiourea residues.

SN/T 0190-2012: Determination of ethylenethiourea residues in fruit and vegetable for export. GC-MS 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.
Determination of ethylenethiourea residues in fruit and vegetable for export.GC-MS method People's Republic of China Entry-Exit Inspection and Quarantine Standards Replacing SN 0190-1993 Export fruit and vegetables ethylene thiourea Residues Determination by gas chromatography-mass spectrometry Issued on. 2012-10-23 2013-05-01 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. This standard replaces SN 0190-1993 "fruit for export ethylene thiourea residues in." This standard compared with SN 0190-1993, the main technical changes are as follows. --- The name of the standard was revised; --- The original standard was extended detection range, in addition to fruits and vegetables increased; --- Derivatized method is improved by the GC to GC-MS method; --- Omitted sampling procedure. This standard is proposed and managed by the National Certification and Accreditation Administration Committee. This standard was drafted. People's Republic of China Shanghai Entry-Exit Inspection and Quarantine Guangzhou People's Republic of China Xinsha Office. The main drafters of this standard. Li Han, Gao Jun, FAN Xiang, Wang Min, male Iraqi sea, Deng Xiaojun, Yang Huiqin. This standard replaces the standards previously issued as follows. --- SN 0190-1993. Export fruit and vegetables ethylene thiourea Residues Determination by gas chromatography-mass spectrometry

1 Scope

This standard specifies the export of fruits and vegetables Determination of ethylene thiourea residues. This standard applies to fresh orange, water chestnut, apple, broccoli, spinach and other fruits and vegetables Determination of ethylene thiourea residues.

2 Method summary

Methanol extract residual ethylene thiourea sample, extract with 1% benzyl chloride - methanol solution was refluxed in a boiling water bath for generating an ethylene benzyl Thiourea, by adjusting the pH and liquid-liquid extraction purification, and then trifluoroacetic anhydride derivative, gas phase chromatography - mass spectrometer, external standard.

3 Reagents and materials

Unless otherwise specified, reagents were analytical pure, distilled water. 3.1 methanol. liquid chromatography. 3.2 dichloromethane. residual level. 3.3 hexane. Residual level. 3.4 Toluene. residual level. 3.5 ethylene thiourea standards (Ethylenethiourea, formula C3H6N2S, CASN o96-45-7). purity > 99%. 3.6 benzyl chloride. 3.7 anhydrous sodium. 650 ℃ burning 4h, stored in a desiccator, cool reserve. 3.8 5mol/L sodium hydroxide solution. Weigh 20g sodium hydroxide dissolved in an appropriate amount of water, and diluted with water to 100mL. 3.9 6mol/L hydrochloric acid solution. lessons 54mL of concentrated hydrochloric acid, diluted with water to 100mL. 3.10 trifluoroacetic anhydride/toluene solution. 19, volume ratio. 3.11 1% benzyl chloride - methanol solution.199, by volume. 3.12 ethylene thiourea standard solution. Weigh accurately ethylene thiourea standards, dissolved in methanol, and formulated to a concentration of 1.0mg/mL Standard Stock solution. Methanol diluted to concentrations applicable standard working standard solution was needed then.

4 instruments and equipment

4.1 Gas chromatography - mass spectrometry. with electron impact ionization source. 4.2 Organization mixer. 4.3 oscillator. 4.4 centrifuge. 4.5 electric heated water bath. 4.6 vortex mixer. 4.7 rotary evaporator. 4.8 nitrogen blowing instrument. 4.9 plastic centrifuge tube, 50mL. Derivatized 4.10 2mL vial with a screw cap (with Teflon liner seal).

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