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GB/T 5009.219-2008 English PDF

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GB/T 5009.219-2008: Determination of the residues of chlorcholine chloride in cereals
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GB/T 5009.219-2008English169 Add to Cart 3 days [Need to translate] Determination of the residues of chlorcholine chloride in cereals Valid GB/T 5009.219-2008

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Standard similar to GB/T 5009.219-2008

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Basic data

Standard ID GB/T 5009.219-2008 (GB/T5009.219-2008)
Description (Translated English) Determination of the residues of chlorcholine chloride in cereals
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard C53
Classification of International Standard 67.040
Word Count Estimation 7,720
Date of Issue 2008-12-03
Date of Implementation 2009-03-01
Regulation (derived from) National Standard Approval Announcement 2008 No.22 (Total No.135)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the determination of chlormequat residues in cereals. This standard applies to corn, determination of chlormequat residues buckwheat. This standard for maize, buckwheat chlormequat residues detection limit of 0. 01mg/kg, the linear range of 0. 005mg/L ~ 1. 00mg/L.

GB/T 5009.219-2008: Determination of the residues of chlorcholine chloride in cereals

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Determination of the residues of chlorcholine chloride in cereals ICS 67.040 C53 National Standards of People's Republic of China Determination of chlormequat residues in cereal grains Posted 2008-12-03 2009-03-01 implementation People's Republic of China Ministry of Health Standardization Administration of China released

Foreword

Appendix A of this standard is an informative annex. This standard is proposed and administered by the People's Republic of China Ministry of Health. This standard by the People's Republic of China Ministry of Health is responsible for interpretation. This standard was drafted. China Inspection and Quarantine Science Research Institute, People's Republic of China Yantai Exit Inspection and Quarantine. The main drafters of this standard. Li Li, Sui Tao, Wang come, Sun Jun, Wang Hongbing, Chu Xiaogang. Determination of chlormequat residues in cereal grains

1 Scope

This standard specifies the method for determination of chlormequat residues in cereal grains. This standard applies to corn, buckwheat determination of chlormequat residues in. This standard corn, buckwheat chlormequat residue detection limit of 0.01 mg/kg, the linear range of 0.005 mg/L ~ 1.00mg/L. Principle 2 After extraction with methanol according to the solubility of CCC sample extract purified by alumina column, and benzene derivatives produced by the reaction of sodium sulfur, distribution There are mass selective detector for gas chromatography (GC-MSD) was measured, quantified by external standard.

3 Reagents and materials

Unless otherwise noted, all reagents were of analytical grade water as a water (conductivity 25 ℃ ≤0.01mS/m). 3.1 anhydrous sodium sulfate (Na2SO4). burning 4h at 650 ℃, after cooling stored in a desiccator. 3.2 neutral alumina (Al2O3). 650 ℃ burning 4h, stored in a sealed container before use at 130 ℃ drying 2h, cold storage in a dryer But spare. 3.3 benzene Sodium (C6H5SNa). 3.4 methanol (CH4O). 3.5 2-butanone (C4H8O). 2-butanone solution of 3.6 6mg/mL of benzene Sodium. Weigh 0.6g of sodium thiophenol in a stoppered flask, was added 100mL dried over anhydrous sodium Dehydration of 2-butanone. 3.7 chlormequat (C5H13NCl2) standards. purity > 98.0%, CAS 999-81-5 is. 3.8 Cycocel standard solution. Accurately weigh an adequate amount Cycocel standard, accurate to 0.0001g, prepared in methanol concentration 100mg/L stock standard solution, according to the needs and then diluted with methanol to the appropriate concentration of the standard solution, stored at 4 ℃ refrigerator, you can use 90d.

4 Instrument

4.1 Gas chromatography - mass spectrometry. equipped with electron impact ionization (EI source). 4.2 ultrasonic extractor. 4.3 neutral alumina column. 12.5cm × 1.5cm (inner diameter), with sand core, built-3cm high column of neutral alumina. 4.4 tube. 5mL, with ground glass stopper. 4.5 rotary evaporator. Step 5 Analysis 5.1 Extraction Crushed and weighed by 2.0mm round hole sieve sample 20g (accurate to 0.01g) in 250mL stoppered Erlenmeyer flask, 60mL Methanol extracts on ultrasonic extraction 20min, the extract was 2g anhydrous sodium sulfate and filtered. Were washed twice with 20mL of methanol with stopper cone

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