Non-derivative detection method for ethylene bisdithiocarbamates

The technology of a dithioamino group and a detection method is applied in the non-derivatized detection field of ethylene bis-dithiocarbamate pesticides, which can solve the problems of complicated and complicated operations, and achieve simple pretreatment, high reproducibility, and sensitivity. good effect

Active Publication Date: 2019-05-10
SOUTH CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pretreatment involves derivatization and solid phase extraction, and the operation is cumbersome and complicated
[0006] In s...

Method used

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  • Non-derivative detection method for ethylene bisdithiocarbamates
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  • Non-derivative detection method for ethylene bisdithiocarbamates

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Experimental program
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Embodiment 1

[0061] Embodiment 1 A kind of detection method of dyson pesticide

[0062] Preparation of standard solution: Weigh 0.001g of Mancozeb, Maneb, Zinc, Mancozeb, Sodium, Propineb, and Metabam respectively in a 10ml volumetric flask, and add 0.01g of ethylenediamine As a solid disodium tetraacetate, dissolve it with 3% aqueous solution of ethylenediamine, and dilute to the mark. Accurately draw appropriate amounts of 9 standard stock solutions, put them in a 10ml volumetric flask, and gradually dilute them with 3% ethylenediamine aqueous solution to form a mixed standard working solution of appropriate concentration.

[0063] Preparation of solution: Weigh 0.1g of EDTA2Na solid into a 100mL volumetric flask, add 5mL of ethylenediamine solution, and dilute to 100mL with ultrapure water.

[0064] Weigh 5.0g of the sample to be tested in a 50ml centrifuge tube, soak twice in 20ml of water, vortex for 10min, let stand for 10min, and filter with a filter; soak twice in 20ml of carbon d...

Embodiment 2

[0074] The selection of embodiment 2 solvent

[0075] 1. Experimental method

[0076] The dyson pesticides were dissolved with 3% ethylenediamine methanol solution of EDTA and 3% ethylenediamine aqueous solution of EDTA respectively, and the stability of dyson pesticides were investigated at 1h, 2h, 1Day and 1Week.

[0077] 2. Experimental results

[0078] The results are shown in Table 2 and figure 2 , the results showed that 3% ethylenediamine methanol solution of EDTA could dissolve the dyson, but the dyson quickly decayed to nothing within 2 hours. However, the dysons in 3% ethylenediamine aqueous solution of EDTA can remain stable for 60 days. Therefore water was chosen as the solvent.

[0079] The influence of different solvents of table 2 on the dissolution of Dyson:

[0080]

Embodiment 3

[0081] The influence of different amines of embodiment 3 on the solubility of dysons in EDTA aqueous solution

[0082] 1. Experimental method

[0083] Use ethylenediamine, isobutylamine, dimethylamine, ammonia water, di-n-butylamine, and pyridine to dissolve dyson pesticides in EDTA aqueous solution respectively, and detect them on the machine. Solubility in EDTA aqueous solution.

[0084] 2. Experimental results

[0085] The results are shown in Table 3. Ethylenediamine can ionize dysonins and can be broken into fragment ions in mass spectrometry, while other amines cannot ionize dysonins. Therefore, ethylenediamine was selected as the dissolving agent of Daisen.

[0086] The influence of different amines of table 3 on the dissolution of Dyson:

[0087]

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Abstract

The invention discloses a non0derivative detection method for ethylene bisdithiocarbamates. According to the method, EBDCs are dissolved through ethylenediamine aqueous solution of EDTA, favorable response exists in mass spectrums, and a non-derivative detection method is found for the EBDCs. The method is simple in pretreatment, does not need derivation and solid-phase extraction, and has favorable recovery rate and accuracy. Through detection, four compounds of maneb, zineb, mancozeb and propineb present a linearity range relationship is a concentration range of 20-2000 ng/ml, and when the correlation coefficient is 0.9946-0.9999 and the adding level is 10, 20 and 100 ug/kg, the recovery rate is 81.40-91.01% and the relative standard deviation is 2.89-4.42%. The method is simple in pretreatment, good in sensitivity, high in reproducibility and suitable for rapid detection of pesticide residues in pericarps.

Description

technical field [0001] The invention relates to the technical field of pesticide residue detection, in particular to a method for non-derivative detection of ethylene bisdithiocarbamate pesticides. Background technique [0002] Mancozeb, Maneb, Zinc, Propineb and other mancozeb pesticides are ethylene bisdithiocarbamate (EBDCs) fungicides. Dysons are insoluble in water, insoluble in most organic solvents, but soluble in pyridine, unstable to light, heat, and humidity, easy to decompose carbon disulfide, and easy to decompose and release when encountering alkaline substances or copper, mercury and other substances carbon disulfide and less effective, less volatile. Due to their low cost, wide application, and low toxicity to humans and animals, this type of fungicide is still widely used in the prevention and control of plant diseases such as grains, vegetables, fruit trees, and forests. [0003] Studies have shown that at a dose of 750mg / kg, rats have hereditary tumors and...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N30/06
Inventor 韦晓群周瑶林杨惠成李心悦李盛楠刘鸿婷王海鸣沈玉栋孙远明雷红涛
Owner SOUTH CHINA AGRI UNIV
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