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Method for rapidly and quantitatively detecting omethoate residue

A technology for omethoate and quantitative detection, applied in the measurement of color/spectral characteristics, etc., can solve problems such as no reports, and achieve the effects of easy popularization, good repeatability and stability, and small detection errors.

Inactive Publication Date: 2015-05-06
HENAN ACAD OF SCI INST OF BIOLOGY LIABILITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Some existing technical research reports show that organophosphorus pesticide molecules contain a P=O or P=S double bond structure, and this structural feature shows the characteristic of showing a stable absorption peak at a specific wavelength of ultraviolet light, which is only used for different organic pesticides. Qualitative detection of phosphorus pesticides, using this characteristic, quantitative detection of organophosphorus pesticide residues is feasible, but such technology has not been reported so far

Method used

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  • Method for rapidly and quantitatively detecting omethoate residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Detection of omethoate-contaminated soil in a suburban pesticide factory

[0036] Soil sample processing: Take non-polluted soil samples and omethoate-contaminated soil samples from the suburban pesticide factory, air-dry them, grind them and pass them through a 100-mesh sieve to get blank soil samples and contaminated soil samples.

[0037] The measurement steps are:

[0038] Step 1, prepare soil sample supernatants with different omethoate final concentrations: get 6 50mL triangular flasks, add 0.50g blank soil sample respectively, add omethoate standard solution respectively according to the concentration gradient of 1.0 to make the blank soil The final concentrations of omethoate in the sample were 0, 1.0, 2.0, 3.0, 4.0, 5.0 g / kg soil respectively, then respectively added 10 mL of deionized water, shaken on a shaking table for 30 min, placed for 30 min, and centrifuged at 6000 r / min for 10 min. min, take the supernatant to prepare soil sample supernatan...

Embodiment 2

[0042] Example 2 Determination of omethoate content in water polluted by omethoate in the drainage ditch of a pesticide factory in a county in eastern Henan

[0043] Step 1, prepare standard aqueous solution of different omethoate final concentrations: get 6 test tubes, add 10ml deionized water respectively, according to the concentration gradient of 0.5, add omethoate standard solution respectively, make omethoate final concentration respectively 0.0 , 0.5, 1.0, 1.5, 2.0, 2.5mg / L standard aqueous solution;

[0044] Step 2, the making of standard curve: with the standard aqueous solution of omethoate final concentration being 0.0mg / L in step 1 as blank control, record respective absorbance value respectively with ultraviolet spectrophotometer, ultraviolet wavelength 210nm, repeat doing three times, Find the average value, take different final concentrations as the abscissa, and take the corresponding absorbance average value as the ordinate, draw a standard curve, and obtain...

Embodiment 3

[0047] Example 3 Determination of Omethoate Content in Chinese Cabbage Contaminated by Omethoate in East Vegetable Garden of Xushui Township

[0048] Chinese cabbage sample processing: Take non-polluted Chinese cabbage and Chinese cabbage contaminated with omethoate in the East Vegetable Garden of Xushui Township, cut into strips, squeeze the juice, dilute 10 times and centrifuge, take the supernatant to prepare blank Chinese cabbage supernatant and contaminated Chinese cabbage. Chinese cabbage supernatant.

[0049] The measurement steps are:

[0050] Step 1, prepare the Chinese cabbage supernatant of different omethoate final concentrations: get 6 test tubes, add 5ml blank Chinese cabbage supernatant respectively, according to the concentration gradient of 0.5, add omethoate standard solution so that the final concentration is respectively 0.0, 0.1, 0.5, 1.0, 1.5, 2.0 mg / L, shake the shaker for 5 minutes, and stand still for 10 minutes to obtain 6 Chinese cabbage supernata...

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Abstract

The invention relates to a method for rapidly and quantitatively detecting omethoate residue. According to the present invention, the characteristic that the omethoate aqueous solution presents the stable absorption peak at the specific ultraviolet wavelength is utilized to establish the method, wherein the omethoate content is proportional to the absorbance value and the proportional change trend is presented in the coordinate system so as to establish the standard curve, and the detected absorbance mean value of the detected sample is substituted into the regression equation so as to calculate the omethoate content in the sample, such that the purpose of the rapid and quantitative omethoate residue detection is achieved.

Description

technical field [0001] The invention belongs to the technical field of drug detection, in particular to a method for rapid and quantitative detection of omethoate residues. Background technique [0002] In recent years, organophosphorus pesticides (Organophosphorus pesticides, Ops) have played an extremely important role in world agriculture due to their high efficiency and low cost of use, and are one of the main pesticides. Organophosphorus pesticides are medium- and high-toxic pesticides with systemic toxicity, large residues in the environment, and most of them are difficult to degrade. While protecting crops, they also cause serious environmental pollution and directly or indirectly endanger human health. Omethoate is one of the most widely used and most used organophosphorus pesticides. Like other organophosphorus pesticides, its advantages and harms coexist: Omethoate is sprayed with high concentration root irrigation, which will lead to soil pollution, and the pollut...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 王继雯陈国参岳丹丹李冠杰张晓梅刘莹莹杨文玲甄静宁萌贾彬
Owner HENAN ACAD OF SCI INST OF BIOLOGY LIABILITY
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