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Method for rapidly identifying recessively added prohibited and restricted pesticides in fertilizer

A fertilizer and rapid technology, applied in the rapid identification of the hidden addition of banned and restricted pesticides in fertilizers, rapid identification of the implicitly added two banned and restricted pesticides methamidophos and omethoate in fertilizers, in the field of thin layer chromatography, can solve the problem. Time-consuming and other problems, to achieve the effect of easy operation

Active Publication Date: 2022-04-08
INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI
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Problems solved by technology

[0005] Based on this, it is necessary to address the time-consuming technical problems of existing instrument identification, and provide a thin-layer chromatography method for quickly identifying two banned and restricted pesticides, methamidophos and omethoate, hidden in fertilizers, without the need for large-scale Pre-processing equipment, only need to judge the color and Rf value by naked eyes

Method used

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  • Method for rapidly identifying recessively added prohibited and restricted pesticides in fertilizer

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Embodiment 1

[0025] In the solid fertilizer in the present embodiment 1, the thin-layer chromatographic method for fast identification of two kinds of prohibited pesticides of recessively added methamidophos and omethoate comprises the following steps:

[0026] 1) Weigh 2g of solid fertilizer, add 5ml of ultrapure water, fully mix and dissolve, add 10ml of acetonitrile and 3g of sodium chloride, mix vigorously, and after standing for 30min, take 0.5ml of the supernatant;

[0027] 2) Spot 0.5ml sample on GF254 silica gel thin-layer plate with capillary tube, and after the solvent volatilizes for 1min, use a mixed solvent made of petroleum ether, dichloromethane, and methanol with a volume ratio of 3:6:1 to develop, and completely expand Finally, the thin-layer plate was taken out, and after the solvent evaporated for 1 min, the color was developed using a palladium chloride solution. Palladium chloride solution preparation method: Weigh 0.06g of palladium chloride solid (purity above 99%), ...

Embodiment 2

[0030] In the liquid fertilizer in the present embodiment 2, the thin-layer chromatography method of two kinds of banned pesticides of recessively adding methamidophos and omethoate rapidly is identified, comprises the following steps:

[0031] 1) Measure 5ml of liquid fertilizer, add 3ml of ultrapure water, mix and dissolve thoroughly, add 10ml of acetonitrile and 3g of sodium chloride, mix vigorously, and after standing for 30min, take 0.5ml of supernatant;

[0032] 2) Spot 0.5ml sample on GF254 silica gel thin-layer plate with capillary tube, and after the solvent volatilizes for 1min, use a mixed solvent made of petroleum ether, dichloromethane, and methanol with a volume ratio of 3:6:1 to develop, and completely expand Finally, the thin-layer plate was taken out, and after the solvent evaporated for 1 min, the color was developed using a palladium chloride solution. Palladium chloride solution preparation method: Weigh 0.06g of palladium chloride solid (purity above 99%),...

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Abstract

The invention discloses a method for rapidly identifying recessively added forbidden and limited pesticides in a fertilizer. The method comprises forbidden pesticide methamidophos and limited pesticide omethoate. The method comprises the following steps: weighing a solid fertilizer or a liquid fertilizer, dissolving with ultrapure water, adding acetonitrile and sodium chloride, violently mixing, standing for layering, and taking supernate; carrying out sample application on the supernate on a thin-layer plate by using a capillary tube, developing by using petroleum ether, dichloromethane and methanol, and developing by using palladium chloride; rapid identification can be carried out according to Rf values and color development of methamidophos and omethoate, the color development time of methamidophos is 2 min, the color shows deep yellow, and Rf is 0.36; the color development time of omethoate is 10 min, the color is light yellow green, and Rf is 0.41. The identification method disclosed by the invention is simple and convenient to operate, does not need large-scale pretreatment equipment, is used for on-site rapid detection of solid fertilizers or liquid fertilizers, and can rapidly identify two forbidden and limited pesticides, namely methamidophos and omethoate, which are recessively added into the fertilizers only by judging color development and Rf values with naked eyes.

Description

technical field [0001] The invention belongs to the technical field of pesticide residue analysis, and discloses a method for quickly identifying hidden pesticides added in fertilizers that are prohibited and restricted, and specifically relates to the method for rapidly identifying the hidden pesticides added in fertilizers, methamidophos and omethoate Thin layer chromatography method. Background technique [0002] The type and dosage of organophosphorus pesticides, the types of crops and environmental conditions can all affect the residues of organophosphorus pesticides in food. At present, since methamidophos, dimethoate, parathion, methyl parathion, dichlorvos and other highly toxic organophosphorus pesticides are used most and frequently, the pesticide residues in food, especially vegetables, exceed the standard. Organophosphorus pesticides are likely to cause pollution to plant food. Most of the pesticides are sprayed directly on the surface of the crops, so the pesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/90
Inventor 林涛黎其万刘宏程罗志鑫方海仙耿慧春陈兴连王丽
Owner INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI
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