This standard specifies the determination method for phosmet residues in rice, wheat and vegetables. This standard is applicable to the determination of phosmet residues in rice, wheat and vegetables. The detection limit of this standard is 1.50×10 GB/T 5009.131-2003 Determination of phosmet residues in plant-based foods GB/T5009.131-2003 Standard download decompression password: www.bzxz.net

FCS67.040
National Standard of the People's Republic of China
GB/T 5009.131—2003
Replaces GB/16335-19s
Determination of phosmet residaes in vegetable Ewods2003-08-11Promulgated
Health Administration of the People's Republic of China
Standardization Administration of the People's Republic of China
Implementation on 2004-0-01
FR/T5009.131—2003
This standard replaces GB/15335-196 Determination of phosmet residaes in vegetable foods Compared with GB/T16335-1916, this standard has been modified as follows: the Chinese name of the standard has been changed, the text of the standard is "Determination of thiophos residues in physical foods" (3/25301.4-2001 Standardization Plan Part 4: Chemical Analysis Methods), and the original standard has been revised. The standard is from the Ministry of Health of the People's Republic of China. The originating units of this standard are: Chinese Academy of Agricultural Sciences, Food Safety Inspection Institute of the Ministry of Health. The main drafters of this standard are: Zhang Qiao, Zhang Linxia, ​​Shen Cunzhong, Zhang Ye, and Qiao Dajin. The original standard was revised and issued in 1996, and this is the second revision. S
1 Scope
Determination of phosmet residues in plant foods This standard specifies the method for determining the amount of phosmet residues in food waste, food waste and food waste. This standard is applicable to the determination of phosmet residues in food waste, food waste and food waste. The test base of this standard is 1.50×1C\R.bzxZ.net
2 Principle
CB/T5009.131—2003
The sample containing phosmet is burned in a hydrogen-rich flame and the sample is in the form of HP film. · When the light is effective, it emits a special light with a wavelength of 5nm. After the characteristic light is selected by the optical film, it is received by the light return tube and converted into an electrical signal, which is then recorded by a micro-amplifier. The peak height of the sample is compared with the peak height of the standard sample to calculate the maximum content of the sample. 3 Reagents
3.1 Two taels
3.3 Calcium sulfate aqueous solution
3.4 ​​Standard pesticide micro-weigher with an appropriate amount of nitrile thiocyanate pesticide standard product plhnsme, prepare it with acetone to make a reserve solution, and store it in a spherical box
3.5 Labeled pesticide use solution: When in use, use the standard preparation of C and other standard preparations to condense the group to the required degree, 4.1 Gas chromatograph, 4.2 Electric silver detector, 5.1 Analysis steps, 5.1.1 Vegetables: Chop the vegetables into pieces. Weigh 5 pieces and put them into a crushing cup, add 73mL of the mixture into a crusher, crush them on a crusher, transfer them to a 5-meter separator, add 25mL sulfuric acid into a tower with 0.20% 0.2, and pass the liquid through a gelatin layer, concentrate to 1 mL, and then analyze by gas chromatography. 5.1.2 Formerly, shell the rice, pass the powder through a 2°C sieve, and mix well. Weigh 10%, stomach: \ plate, add 4) mL propylene, extract 1 hs, filter to determine the volume of 5TL inlet gas chromatograph, 5.1.3 small walk: grind the sample for 2 days, sieve, mix, you or surface in the cylindric bottle, add 1 tadalafil standard filter, filter, determine the concentration of 5Tm). Inlet gas chromatograph, 5.2 chromatographic attenuation
5.2.1 Chromatographic column, 3mm. Length 0,:m. Inside %0V-101/Ch.mnonrhAwDMCS50 days--122 countries.
5.2.2 Gas washing, carrier gas is 70ml./mm air 0.7kg/cm, hydrogen 0.2kg/cm. 5.2.3 Temperature, injection port, 2℃ column group: 183. CB/T5009.131—2003
5.3 Determination
Prepare a series of insoluble and non-concentrated standards according to the instrument interface, inject 2 μL of the standard pesticides of different concentrations into the gas chromatograph, and finally prepare a standard curve according to the measured peak height. At the same time, take 2 μL~5 μL of the sample liquid and inject it into the gas chromatograph: compare the peak height obtained with the peak of the standard product, and calculate the content of the sample pesticide. 5.4 Calculation of results
Calculate according to the following formula:
W|
X—the amount of phosphorus pesticide in the sample, in milligrams per kilogram (mg/kg); A—the phosphorus content in the standard substance to be measured, in nanograms (nR); FV:-the sample determination period, in milliliters (mL); V: the sample injection volume, in microliters (nL);-the peak height of the standard, in milliliters (Im); the peak height of the sample, in nanometers (nm);
—-the mass of the sample, in grams (g). The calculation result shall be rounded to two significant figures.
6 Precision
The absolute difference between two independent determination results obtained under the regressive condition shall not exceed twice the arithmetic half-mean. -52
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