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Method for analyzing triazole pesticide residue in water

A technology for pesticide residues and triazoles, which is applied in the field of analysis of triazole pesticides residues in water, can solve the problems of limited application, and achieve the effects of high extraction efficiency, fast phase formation, and simple operation

Active Publication Date: 2019-03-15
ZHEJIANG UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the centrifugation method in the physical method utilizes the difference in density to promote stratification, which is the most common demulsification method in the extraction process of the two-phase system. However, the specification limit of the centrifuge limits the application of this method.

Method used

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  • Method for analyzing triazole pesticide residue in water
  • Method for analyzing triazole pesticide residue in water
  • Method for analyzing triazole pesticide residue in water

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Example 1: Detection of triazole pesticide residues in environmental water samples

[0050] (1) Preparation of deep eutectic solvent

[0051] Weigh a certain amount of dried hydrogen bond donor (HBD) and a certain amount of hydrogen bond acceptor (HBA), put them in a 500mL round bottom flask, and keep stirring at 80°C for 2h until a clear and uniform liquid solvent is formed , the deep eutectic solvent. Store in dry conditions until use. Table 1 lists the synthesis raw materials and corresponding molar ratios of the seven deep eutectic solvents used in this experiment.

[0052] Table 1 Deep eutectic solvent synthetic raw materials

[0053]

[0054] (2) Preparation of standard solution

[0055] Accurately weigh 0.1g of myclobutanazole, tebuconazole, and difenoconazole in a 100mL volumetric flask, dilute to volume with methanol, prepare a mixed standard stock solution with a concentration of 1000mg / L, store it in an environment at 4°C, and store it for later use. ...

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Abstract

The invention provides a novel method for analyzing the triazole pesticide residue in water based on bubbling-assisted demulsification-eutectic solvent aqueous two-phase system. According to the basicconcept of the invention, carbon dioxide bubbling-assisted demulsification is fully utilized, so that an emulsion can be quickly clarified without using additional centrifuging equipment; the eutectic solvent aqueous two-phase system has the advantages of environment friendliness, good biocompatibility, low cost, fast phase formation, high extracting efficiency and the like; based on the advantages of the two, the bubbling-assisted demulsification and the eutectic solvent aqueous two-phase system are combined, so that the demulsification effect is obvious and the operation is simple, safe andenvironmentally friendly; the method is applicable to enrichment of a relatively low-concentration compound in water as well as analytic determination based thereon.

Description

(1) Technical field [0001] The invention relates to a method for analyzing residues of triazole pesticides in water, in particular to a method for analyzing residues of triazole pesticides in water based on a bubbling-assisted demulsification-deep eutectic solvent two-phase system. (2) Background technology [0002] Liquid-liquid extraction technology is widely used in various pretreatment processes due to its simplicity of operation and equipment. In the traditional liquid-liquid extraction process, the extractant should be immiscible with the sample matrix (mostly water), so as to realize the separation between the two phases after the extraction is completed. Therefore, most of the selected extractants are hydrophobic organic solvents, and most of these solvents have High volatility and certain toxicity. In the extraction process, the use of a large amount of organic extractant may affect the health of operators and cause environmental pollution. Moreover, since the ext...

Claims

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Application Information

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IPC IPC(8): G01N30/88
CPCG01N30/88
Inventor 李祖光劳家正赵奕萍王夏君李上
Owner ZHEJIANG UNIV OF TECH
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