The invention relates to a measurement method for the
cyfluthrin pesticide residue in tea. The method comprises the following steps: firstly,
sample preparation is carried out, namely, tea is dried, ground and sieved; secondly,
cyfluthrin crude extraction is carried out, namely, the tea
powder is placed in a
centrifuge tube, water is added for infiltration,
petroleum ether and a mixed
internal standard operating fluid are added, the mixture is shocked and mixed uniformly,
anhydrous magnesium sulfate,
sodium chloride,
sodium citrate,
sodium hydrogencitrate and methylbenzene are added, and the mixture is shocked uniformly and centrifuged; thirdly,
cyfluthrin crude extract product purifying is carried out, namely, the supernate is taken and placed in a
centrifuge tube,
anhydrous magnesium sulfate and N-propylethylenediamine bonding
solid adsorbents are added, the mixture is shocked uniformly and centrifuged; fourthly, cyfluthrin extraction is carried out, namely, the supernate is taken, extraction, condensation and filtering are carried out in a Florisil column by utilization of the
toluene-isooctane
mixed solution; fifthly, chromatographic detection is carried out. The extraction method is simple, the effects are good, and result integration
processing is simple and accurate. The average
recovery rate of the method is 93.21%-103.75%, the
relative standard deviation is 3.28%-6.20%, the average
recovery rate and the
relative standard deviation meet requirements and the method is accurate and reliable.