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Method for determining residual quantity of 15 kinds of triazole type pesticides in fruit

A technology for pesticide residues and determination methods, which is applied in the field of determination of 15 kinds of triazole pesticide residues in fruits, achieves the effects of high enrichment efficiency, reduced matrix interference, and shortened analysis time

Inactive Publication Date: 2016-07-13
FRUIT TREE INST OF CHINESE ACAD OF AGRI SCI
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Problems solved by technology

So far, there have been no reports of 15 triazole pesticide residues in fruits using QuEChERS sample pretreatment method combined with GPC-GC / MS detection method. Therefore, the establishment of QuEChERS sample pretreatment method combined with GPC-GC / MS quantitative analysis in fruits The detection method of 15 kinds of triazole pesticide residues is of great significance

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  • Method for determining residual quantity of 15 kinds of triazole type pesticides in fruit
  • Method for determining residual quantity of 15 kinds of triazole type pesticides in fruit
  • Method for determining residual quantity of 15 kinds of triazole type pesticides in fruit

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Embodiment 1

[0023] Embodiment 1: Determination of 15 kinds of triazole pesticide residues in fruit

[0024] 1. Sample pretreatment method

[0025] Accurately weigh 10 g (accurate to 0.01 g) of the homogenized fruit sample into a 50 mL plastic centrifuge tube, add 10.0 mL of acetonitrile solution, 1.0 g of NaCl, 4.0 g of anhydrous MgSO 4 , shake for 1min, centrifuge at 8000r / min for 5min at high speed, absorb 2.0mL supernatant and transfer to the 18 , 300mg of anhydrous magnesium sulfate in a 10mL centrifuge tube, vortex and mix for 1min, let stand, after the supernatant passes through a 0.22μm filter membrane, take 1.0mL nitrogen to dry, add 1mL acetone / cyclohexane (3 / 7) Reconstitute and mix well.

[0026] 2. Preparation of matrix standard solution: Flusilazole and propiconazole among 15 kinds of triazole pesticide standard products were prepared into standard solutions of different concentrations with acetone, and uniconazole, hexaconazole and myclobutanil were respectively prepared wi...

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Abstract

The invention relates to a method for determining the residual quantity of 15 kinds of triazole type pesticides in fruit. The method comprises the following steps of (1) sample pretreatment: homogenated fruit samples are subjected to vibration shaking and high-speed centrifugation by using an acetonitrile solution, NaCl and anhydrous MgSO4 to obtain an extracting solution; then, PSA, C18 and anhydrous magnesium sulfate are selected as adsorbents to perform dispersive solid-phase extraction on the extracting solution; still standing, microporous filtering membrane passing and nitrogen gas drying through blowing are performed; next, redissolving is performed by an acetone and cyclohexane mixed solvent; uniform mixing and determination preparation are performed; (2) substrate standard solution preparation; (3) on-line gel color spectrum series gas chromatography-mass spectrum determination. The method has the characteristics of low background interference, high enrichment efficiency, high sensitivity, simplicity, convenience, high speed and accuracy, and can meet the residue monitoring requirements of the triazole type pesticides in the fruit.

Description

technical field [0001] The invention relates to a method for determining pesticide residues in fruits, in particular to a method for determining 15 kinds of triazole pesticide residues in fruits. Background technique [0002] Triazole pesticides belong to organic heterocyclic compounds. There are many kinds, including fungicides, insecticides, and plant growth regulators. They have excellent characteristics such as high efficiency, broad spectrum, long-acting, systemic absorption, and low toxicity. A class of high-efficiency fungicides with a wide range, flexible use methods, good control effects, and the most potential for development and application. However, with the increasing use of triazole pesticides in fruits, the food safety problems caused by their residues have attracted more and more attention. In order to ensure the safety of consumers, countries have established strict maximum residue limits of 0.010mg / kg for triazole pesticide residues in different fruits and...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 李海飞聂继云徐国锋毋永龙闫震李静李志霞匡立学李明强程杨沈友明关棣凯
Owner FRUIT TREE INST OF CHINESE ACAD OF AGRI SCI
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