This standard specifies the method for determining the amount of ethylene dibromide residue in grain fumigated with ethylene dibromide. This standard is applicable to the determination of ethylene dibromide residue in grain fumigated with ethylene dibromide. GB/T 5009.73-2003 Determination of ethylene dibromide residue in grain GB/T5009.73-2003 Standard download decompression password: www.bzxz.net

ICS67.040
National Standard of the People's Republic of China
GB/T5009.73—2003
Replaces GR/1U—1984
Determination of ethylene dibromide residues in grains
Promulgated on August 11, 2003
Ministry of Health of the People's Republic of China
National Standards Administration of Standardization of the People's Republic of China
Implementation on January 1, 2004
GB/T5009.73—2533
This standard replaces GB/T471984 Hygienic standard and test method for ethylene dibromide residues in food3. Compared with G/40-151, this standard is mainly modified as follows: the Chinese name of the standard is changed to "Determination of Monobromoethane Residues in Grains" in accordance with Part 4 of the Regulations on the Preparation of Chemical Substances of the Institute of Food Safety. The new method 2 of the original standard has been revised. The standard was proposed by the Ministry of Health of the People's Republic of China. The main sponsors of this standard are Zhang Linxia and Xu Jin. The original standard was issued in 164, and this is the first revision. The standard specifies the method for the determination of monobromoethane residues in grains steamed with dibromoethane: the determination of dibromoethane residues in grains steamed with dibromoethane is carried out according to the standard 12301.10. The standard specifies the method for the determination of monobromoethane residues in grains steamed with dibromoethane: the determination of dibromoethane residues in grains steamed with dibromoethane is carried out according to the standard 12301.10. The standard specifies the method for the determination of monobromoethane residues in grains steamed with dibromoethane: the determination of dibromoethane residues in grains steamed with dibromoethane is carried out according to the standard 12301.10. Reagents 2.1 Alcohol: 1% ethanol, 1% sodium chloride 2.2 Calcium anhydrate 2.3 Sodium chloride 2.4 Acetone: 1% acetone/water 2.5 Diethylene glycol: 1% ethanol 2.5 Diethylene glycol: 1% ethanol 2.6 Prepare in 1% ethanol, transfer to a concentration of 0.2 g per tablet. 3 Instruments
3.1 Gas chromatograph
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3.2 Gas chromatograph conditions
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3.2.1 Control: mx3ntrt inner diameter), steel sample, inner tuber containing 15% polyol (polyp:opleneglysol) or 15% Leon LBbcX 6u day ~.&: R Chromeo-b W3.2.2 Recording speed, 1aV.
3.2.3 Speed, 0.5cm/mir
3.2.4 Gas 70t/.
3.2.5 Temperature: 140%
3.2.6 Detector and injection port temperature, 2℃. ": Add no mediator to determine the internal group, the following chromatographic sample can be used:?>%ov-ul T Chruel JIr K Monthluc -GenChnQ Monthn
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4.1 Sample treatment
The sample is stored below 5%, quickly weigh 50% of the sample, 1g) 250mL of male shape, _50mL ketone water dissolution. Need to seat, select spoon: set at 2℃~5% whistle Pool 48E. 24 standard needs once. Absorb 1. Supernatant is placed in 541
LA/T5C09.73-2003
25mL stopper test tube, add 2g sodium sulfide, seal, vibrate for 2mil, let stand for more than 1Gmn, for gas chromatograph determination, 4.2 determination
when the standard line is also used, absorb 9.0.0.5, 1.0.3.C.5.0.7.Um1 . Use diethyl ether standard (equivalent to 0.0.C.: 0.2.5.1., 1.1P austenite). Change the sample immediately. According to the standard supply line. The sample is diluted 10 times or 100 times with anhydrous internal fluid and then injected 0.5 times. The standard line is relatively close.
4.3 Result calculation
: 1),
m:x1c95
X-the diethyl ether in the sample Content, unit is microgram (/k) - the mass of the sample solution equivalent to the first reaction, unit is point (): test sample rest! Sheep should be microgram:
- test mass, unit R
5 reagents
ml. The volume of ketone in the sample solution, unit is liter (mL): distillation method (MS method)
5.1 After washing, filter and check the gas chromatography for the absence of ten-shaped peaks. 5.2 Remove (aker 5.3 Sodium fluoride. 5.4 Standard ethane, prepared with ethane in several different concentrations, and placed on ice. 6.1 Gas chromatograph with electrophoresis detector, 6.2 Gas chromatograph components G.2.1 Spectrum: ?-.X3rm stainless steel, with 9% Squalene 9~10% Chramosorb wHP inside 6.2.2 Temperature, 75°C 6.2.3 Detector temperature, 275°C 6.2.4 Sample value: 2°C 6.2.5 6.3 Evaporation and addition tube 100mL flask, add 1cmL of water and 10mL of benzene, connect the tube to the flask, place it on the heating plate and heat it until the sample is completely burned. When more is needed, you can remove excess benzene by slicing the left pool. Water begins to accumulate under the burned layer and remove the heater. After cooling, record the amount of hexane recovered and transfer it to the test tube, add 2~3 % sodium sulfate solution for gas chromatography determination.
7.2 Determination
According to 4.2. Inject the same amount of isocyanate and stop using the standard peak height standard line: 7.3 Calculate the result
formula (2).
In the formula;
mx100u
xtccexcoo
or the amount of ethane. The unit is micrograms per gram
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