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Analysis method of metham

An analysis method, Weibaimu technology, applied in the field of pesticide analysis, can solve the problems of poor operability, long consumption time and high analysis cost, and achieve the effect of saving chemical reagents and labor.

Inactive Publication Date: 2021-02-02
利民化学有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in this method. First, a large amount of chemical reagents are used, which need to be heated to release hydrogen sulfide gas. Incomplete collection will cause a lot of damage to the human body. Second, the operation is complicated, takes a long time, has poor accuracy, and the recovery rate of precision is low. Very low: while the ion chromatography method has poor reproducibility and poor operability
Using ion chromatography analysis, because metamule is an alkaline substance, it is corrosive to the chromatographic column, which shortens the service life and causes high analysis costs; and this method cannot completely elute and separate the metamule sample

Method used

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  • Analysis method of metham

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of the standard substance solution of metabolite: accurately weigh 40 mg (accurate to 0.01 mg) of the standard substance of metabolite with a content of 85.0 wt %, put it in a 100 ml volumetric flask, and use methanol+water solution (the volume ratio of methanol to water is 30 :70) diluted, shaken up by ultrasonic for subsequent use, and the HPLC chromatogram of the standard product of Metabam is as follows figure 1 shown.

[0035] Preparation of Metamecta sample solution: Accurately weigh about 40mg of the sample containing Metamune (accurate to 0.01mg) in a 100ml volumetric flask, dilute with methanol+water solution (the volume ratio of methanol to water is 30:70), and ultrasonically Shake well for later use, and the HPLC chromatogram of the metabam sample is as follows figure 2 shown.

Embodiment 2

[0037] According to the method of embodiment 1, prepare metabam standard solution and metabam sample solution

[0038] C18 chromatographic column is used, the mobile phase is methanol + aqueous solution (the volume ratio of methanol to water is 30:70) and 1g / L tetrabutyl ammonium hydrogen sulfate, the flow rate is 1.0ml / min, the column temperature is 22°C, and the detection wavelength 255nm, the injection volume is 5μL; enter the standard solution under the above conditions, repeat the injection until the difference between the peak areas obtained by two adjacent injections is less than 1%, and then follow the standard, sample, sample, standard HPLC analysis was carried out according to the sequence to obtain the HPLC chromatogram of metabam; according to the formula of the external standard method of liquid chromatography, the content of metabam was obtained as 35.07%.

Embodiment 3

[0040] According to the method of Example 1, a standard solution of metamure and a sample solution of metamule were prepared.

[0041] C18 chromatographic column is used, the mobile phase is methanol + aqueous solution (the volume ratio of methanol to water is 30:70) and 1g / L tetrabutyl ammonium bisulfate, the flow rate is 1.0ml / min, the column temperature is 20°C, and the detection wavelength 255nm, the injection volume is 5μL; enter the standard solution under the above conditions, repeat the injection until the difference between the peak areas obtained by two adjacent injections is less than 1%, and then follow the standard, sample, sample, standard HPLC analysis was carried out according to the sequence to obtain the HPLC chromatogram of metabam; according to the formula of the external standard method of liquid chromatography, the content of metabam was obtained as 35.33%.

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Abstract

An analysis method of metham comprises the following steps: preparation of a metham standard substance solution: weighing a metham standard substance, dissolving the metham standard substance by usinga methanol + aqueous solution as a diluent, adjusting the pH value to 7.5-9.5 by using triethylamine, fixing the volume, and uniformly mixing for later use; preparing a metham sample solution, namelyweighing a metham sample, dissolving the metham sample by using a methanol + water solution as a diluent, adjusting the pH value to 7.5-9.5 by using triethylamine, fixing the volume, and uniformly mixing for later use; carrying out high performance liquid chromatography analysis and determination: adopting a C18 chromatographic column, wherein a mobile phase is a methanol + aqueous solution and tetrabutylammonium hydrogen sulfate, the flow rate is 1.0 ml / min, the environment temperature and the column temperature are 15-22 DEG C, the detection wavelength is 255-285 nm, and the sample size is5 [mu] L; and carrying out high performance liquid chromatography analysis and determination on the metham standard substance solution and the metham sample solution to obtain a metham HPLC chromatogram, and obtaining the content of metham according to a liquid chromatography external standard method. The analysis method is simple, convenient, rapid, high in accuracy and precision and capable of reducing harm to the human body and the environment.

Description

technical field [0001] The invention relates to the technical field of pesticide analysis, in particular to an analysis method for metabam. Background technique [0002] Mebam, the chemical name is sodium methyl dithiocarbamate, the pure product is white powder, easy to absorb moisture, the industrial product is light yellow to amber liquid, soluble in methanol and water, but insoluble in most organic solvents, acids and Heavy metal salts cause decomposition but act as a good fumigator for soil. The acute oral LD50 of rats is 285-1800mg / kg, non-toxic to bees. [0003] Metabam is a soil disinfectant with fumigation effect, suitable for nematode control of peanuts, cotton, strawberries, ginger and other root crops, and has a killing effect on weeds and grass seeds within one year. In moist soil, metabam decomposes within two weeks. At present, there are ion chromatography and chemical detection methods reported in the literature. Using chemical analysis, the sample release...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/74
CPCG01N30/02G01N30/06G01N30/74G01N2030/027G01N2030/062
Inventor 李新生许梅孙敬权许宜伟刘文兆孙丽梅许诺高颖
Owner 利民化学有限责任公司
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