Method for detecting 18 kinds of organic chloride pesticide residues in Chinese medicinal material
A technology for pesticide residues and traditional Chinese medicinal materials, applied in the field of pesticide residue detection, can solve the problems of long residue time, complicated purification, different sample matrices, etc., and achieves the effect of quickness, convenience, cost, and simple process.
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[0012] The following embodiments help those skilled in the art to better understand the present invention, but do not limit the present invention in any way. Example 1: Multi-residue analysis of 18 organochlorine pesticides in chrysanthemum
[0013] The chrysanthemum samples were dried in the shade, crushed, and passed through a 60-mesh sieve. Accurately weigh 2.0g sample, add 2.0g anhydrous Na 2 SO 4 , Grind thoroughly, and transfer to a 100mL Erlenmeyer flask with stopper. Add 30 mL of acetone: petroleum ether (1:1) and ultrasonically extract for 15 min, let it stand, and filter the supernatant into a 100 mL pear-shaped bottle. The extraction was repeated twice with 20 mL of acetone: petroleum ether (1:1), and the operation was the same as above. The collected filtrate was concentrated in a 40°C water bath to nearly dryness. Quantitatively transfer the concentrated residue with petroleum ether to a 10 mL graduated test tube with a stopper to make the volume to 5 mL, carefull...
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[0015] Example 2 Multi-residue analysis of 18 organochlorine pesticides in ginkgo leaves
[0016] The ginkgo biloba samples were dried in the shade, crushed, and sieved. Accurately weigh 2.0g sample, add 2.0g anhydrous Na 2 SO 4 , Grind thoroughly, and transfer to a 100mL Erlenmeyer flask with stopper. Add 30 mL of acetone: petroleum ether (1:1) to ultrasonically extract for 15 min, let it stand, and filter the supernatant into a 100 mL pear-shaped bottle. The extraction was repeated twice with 20 mL of acetone: petroleum ether (1:1), and the operation was the same as above. All the collected filtrate was concentrated in a water bath at 40°C to nearly dryness. Quantitatively transfer the concentrated residue with petroleum ether to a 10 mL graduated test tube with a stopper to make the volume to 5 mL, carefully add 1 mL of concentrated sulfuric acid containing 10% water, shake for 1 min, separate the center at 3000 rpm for 10 min, and take the supernatant into Gas chromatograp...
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