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GB/T 5009.221-2008: Determination of the residues of diquat in cereals
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 5009.221-2008 | English | 139 |
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Determination of the residues of diquat in cereals
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GB/T 5009.221-2008
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Basic data | Standard ID | GB/T 5009.221-2008 (GB/T5009.221-2008) | | Description (Translated English) | Determination of the residues of diquat in cereals | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | C53 | | Classification of International Standard | 67.040 | | Word Count Estimation | 6,696 | | 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 diquat in cereals residues. This standard applies to corn, barley diquat measured residues. The detection limit of the standard 0. 005mg/kg, the linear range of 0. 001mg/L ~ 0. 100mg/L. | GB/T 5009.221-2008: Determination of the residues of diquat in cereals---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 the residues of diquat in cereals
ICS 67.040
C53
National Standards of People's Republic of China
Determination of Cereals by diquat residues
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. People's Republic of China Yantai Exit Inspection and Quarantine.
The main drafters of this standard. Li Li, Sui Tao, Zhang Hai, Wang, the Wang Hongbing, Chu Xiaogang.
Determination of Cereals by diquat residues
1 Scope
This standard specifies the method for determination of Cereals by diquat residues.
This standard applies to corn, barley diquat determination of residues.
The standard detection limit of 0.005mg/kg, the linear range of 0.001mg/L ~ 0.100mg/L.
Principle 2
According diquat solubility and stability, diuron extracted with 95% ethanol fast, and after the reaction of sodium borohydride, extracted with chloroform, except
To chloroform to normal hexane, gas chromatography - mass spectrometry detector measurement, external standard, using selected ion detection for confirmation and
Quantified.
3 Reagents and materials
Unless otherwise specified, all reagents shall be of analytical grade (organic solvent to be re-distilled) water as a water (conductivity 25 ℃ ≤0.01mS/m).
3.1 n-hexane (C6H14).
3.2 chloroform (CHCl3).
3.3 sodium borohydride (NaBH4).
3.4 hydrochloric acid solution. 2mol/L.
3.5 Sodium hydroxide solution. 5mol/L.
3.6 anhydrous sodium sulfate (Na2SO4). After 650 ℃ burning 4h placed in the dryer.
3.7 95% ethanol solution.
3.8 diquat salt dibromo standard. Purity ≥99%, CAS 6385-62-2 is.
3.9 diquat standard solution. Accurately weigh an adequate amount of diquat dibromo salt standard, accurate to 0.0001g, dissolved in water after 1mL
95% ethanol solution formulated at a concentration of 100μg/mL standard stock solution, if necessary adding a suitable concentration of the working standard solution, Paul
4 ℃ stored in the refrigerator, use 90d.
4 Instrument
4.1 Gas chromatography - mass spectrometry. Hotels (EI source).
4.2 rotary evaporator.
4.3 vortex mixer.
4.4 flat-bottomed flask. 100mL.
4.5 flat-bottomed flask. 50mL.
4.6 funnel. 125mL.
4.7 high-speed disperser homogenizer.
Step 5 Analysis
5.1 Extraction Purification
Weigh milled mix (over 2.0mm round hole sieve) Sample 5g (accurate to 0.01g) in 100mL flat-bottomed flask, 30mL
95% ethanol solution, homogenized 3min. Hydrochloric acid was added 4mL 50mg of sodium borohydride was added, the oscillation 40min (2mol/L) was treated with
5mL95% ethanol solution, rinse the flask and suction filtered twice. The filtrates were combined in a water bath at 35 ℃ ethanol was removed by rotary evaporation, the residual aqueous layer was transferred to
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