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Method for rapid detection of dimehypo and simazine in tea on site

A tea, on-site technology, applied in the field of rapid on-site detection of insecticide and simazine in tea, can solve the problems of selectivity, time-consuming, poor specificity, low sensitivity, etc., and achieves simple operation, easy handling and improved detection sensitivity. Effect

Inactive Publication Date: 2018-10-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional on-site detection methods for pesticide residues mainly include biochemical assays and chromatographic detection methods. Although these methods are widely applicable to the analysis and detection of pesticide residues, they have the characteristics of low sensitivity and poor specificity in the detection of food samples, so to a certain extent Limit its application to on-site rapid detection of pesticide residues in tea
At present, there is still no patent to disclose the detection of bisultap in tea; the Chinese patent (publication number CN 107655990A) detects simazine residues in the farmland environment by gas chromatography. Although the method is accurate and sensitive, it still has Selective, time-consuming, expensive, etc.

Method used

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  • Method for rapid detection of dimehypo and simazine in tea on site
  • Method for rapid detection of dimehypo and simazine in tea on site
  • Method for rapid detection of dimehypo and simazine in tea on site

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: PAD-SERS technology detects dimehypo and simazine

[0029] (1) Preparation of silver ammonia solution

[0030] Take 2mL of 0.01moL / L silver nitrate solution in a test tube, add 100μL of 0.1moL / L sodium hydroxide aqueous solution, shake to produce a light yellow precipitate; drop 80μL of dilute ammonia (0.5moL / L) until the initial The precipitate just dissolved, the silver ammonia solution obtained;

[0031] (2) Construct an analysis device based on PAD

[0032] The paper used in the experiment is 0.22μm cellulose-based filter paper (PC, Whatman), and the device used is a sand core suction filter device. Take 2 mL of the silver ammonia solution in step (1), and use the sand core suction device to filter on the filter paper by vacuum filtration. After the suction filtration was completed, air-dried in a laminar flow cabinet for 30 minutes to obtain a filter paper containing silver ammonia solution. Cut the filter paper into 0.5×2cm strips for use;

[0033] (3) Prepar...

Embodiment 2

[0040] Example 2: Detection of dimehypo and simazine in tea

[0041] Figure 7 A flow chart of dimehypo and simazine in tea according to an embodiment of the present invention is schematically given, and the detection method includes the following steps:

[0042] (1) Prepare silver ammonia solution, the steps are the same as in Example 1;

[0043] (2) Construct an analysis device based on PAD, the steps are the same as in Example 1;

[0044] (3) Prepare silver nanoparticles (Ag NPs) paper chips by silver mirror reaction, the steps are the same as in Example 1;

[0045] (4) The paper chip is wiped on the surface of the sample containing dimehypo and simazine, and the steps are the same as in Example 1;

[0046] (5) SERS detects dimehypo and simazine in tea.

[0047] The tea sample used in the laboratory is Hangzhou West Lake Longjing tea. Take the silver nanoparticle (Ag NPs) paper chip in step (3) to wipe the surface of Longjing tea for 2 minutes, and use a portable Raman spectrometer to...

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Abstract

The invention discloses a method for rapid detection of dimehypo and simazine in a tea on site. The method comprises (1) preparing a silver-ammonia solution, (2) constructing a PAD-based analysis device, (3) preparing a silver nanoparticle (Ag NPs) paper chip by a silver mirror reaction, (4) wiping the surfaces of dimehypo and simazine samples through the paper chip, and (5) detecting the paper chip through a portable Raman spectrometer to obtain SERS spectrums of the samples and comparing the spectrums of dimehypo and simazine solids to realize qualitative and quantitative detection. Comparedwith the prior art, the method has the characteristics of rapid analysis, high sensitivity, small sample consumption, wide application range, simple operation and convenient carrying, can realize analysis and detection of insecticidal dimehypo and simazine in a tea and has detection limits of 1.2*10<-10>moL / L and 1.0*10<-9>moL / L respective to dimehypo and simazine.

Description

Technical field [0001] The invention belongs to the technical field of surface Raman detection, and specifically relates to a method for on-site rapid detection of dimehypo and simazine in tea. Background technique [0002] As a major agricultural production country in my country, various pesticide compounds (such as pesticides, fungicides, algaecides, insecticides, defoliants) are widely used in the tea production process. The long-term large-scale application of pesticides will bring about Serious agricultural non-point source pollution problems, on the other hand, will affect the quality and safety of tea products, and even endanger the agricultural ecological environment and sustainable development. In the traditional tea production process, organochlorine and organophosphorus compounds are the more commonly used pesticides. The main varieties of organochlorine pesticides include DDT, BHC, etc., which are chemically stable and difficult to decompose. Organochlorine pesticides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹段化珍马亚丹邓维曹海荣康娜娜
Owner SHANGHAI INST OF TECH
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