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Determination of propoxur residues in mulberry leaves

The relative standard deviation (CV) <6.42%, the minimum detection limit of 0. O1ng, limit of detection was 0.05mg ・ in compliance with pesticide residue determination of requirements [9qo】. Table 2 Propoxur recoveries in the mulberry leaves results in the mulberry leaves O-O583t4O88 ・ 6o92 ・ 4781.239 O ・ 6487.275.48187 .6296-32102.5491.1 O99.8O95.486.42 black flail flail Shan iv Hu m. NH / sneeze Eagle 38 modern pesticides Volume 8 No. 2 mulberry mulberry propoxur blank and add the chromatogram shown in Figure 3,4. Figure 3, Figure 4 contrast can be seen that the peak position of propoxur do not exist on the interference peak, so extraction with acetonitrile Propoxur disruptors can reduce the presence of the sample to ensure that residues accurate. Figure 3 Figure 4 Mulberry Mulberry blank space to add 3 conclusions 1) the establishment of mulberry leaves in the detection method of propoxur residues. Add a level of 0.05 ~ 1mg ・ kg, the recovery in between 81.23% ~ 102.54%, the maximum coefficient of variation was 6.42%. In the above analysis under the conditions of propoxur in the minimum detectable concentration of mulberry leaves 0.05mg ・ kg one, which shows the accuracy of the method, reproducibility and accuracy of analysis of pesticide residues are in line with the requirements and testing for the actual sample analysis and detection of propoxur. 2) the experimental screening of the extraction solvent, acetonitrile obtained using 50mL pre-treatment methods. Solvent consumption of the pre-treatment process 50mL, far less than the traditional method of the solvent 250 ~ 300mL, the determination of the cost savings and shorten the processing time of samples, the method is simple, rapid, easy, practical, good.
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