Determination method of mesotrione residue in corn
A detection method and nitrosulfonone technology are applied in the field of pesticide residue detection, which can solve the problems of high requirements, high processing costs, low detection limit and precision, and achieve the effects of low cost, low operation requirements and simple operation requirements.
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Embodiment 1
[0072] Establish standard curve of mesotrione electrochemical response
[0073] (1), Accurately weigh 0.08g of mesotrione standard substance, add 50mL of analytical grade acetonitrile to dissolve, completely transfer to a 1L volumetric flask, and then dilute with pH 6 acetic acid-sodium acetate buffer solution to make 80mg / Mesotrione mother liquor of L;
[0074] (2), prepare 5 different concentrations of mesotrione standard working solutions with the above mother liquor, the preparation method is as follows:
[0075] ① Precisely pipette 0.1 mL of the above mother solution into a 100 mL volumetric flask, dilute to volume with acetic acid-sodium acetate buffer solution with pH = 6, and obtain a standard working solution with a concentration of mesotrione of 80 μg / L.
[0076] ② Pipette 50 mL of the above-mentioned 80 μg / L standard working solution into a 100 mL volumetric flask, dilute to volume with acetic acid-sodium acetate buffer solution with pH=6, and obtain a standard wo...
Embodiment 2
[0086] A kind of detection method of mesotrione residual amount in corn, described detection method specifically comprises the following steps:
[0087] First, after crushing 5 g of the corn sample to be tested with a mortar, add it to 30 g of dichloromethane, and fully mix to obtain a mixed solution, heat the mixed solution to reflux at the boiling point of dichloromethane, and continue stirring for 30 minutes after heating to reflux; Subsequently, the mixed solution was ultrasonically extracted with an ultrasonic frequency of 40 kHz for 5 minutes to obtain 20.6 mL of the test solution;
[0088] Subsequently, extract 1ml of the solution to be tested and dilute it to 100ml with pH 6 acetic acid-sodium acetate buffer solution, use the glassy carbon electrode as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum sheet electrode as the auxiliary electrode. The three electrodes were respectively inserted into the liquid to be tested...
Embodiment 3～8
[0098] Using the same corn sample as in Example 1, changing different extraction conditions, and detecting the residual amount of mesotrione in the corn sample according to the same detection method as in Example 1, the results are shown in Table 3.
[0099] Table 3 embodiment 3~8 test data
[0100]
[0101] In summary, the detection method of the residual amount of mesotrione in corn of the present invention, the detection method is by adding a corn sample into an organic solution for ultrasonic extraction to obtain a test solution, and then through electrochemical voltammetry detection, the test solution is obtained. Measure the electrochemical response peak current value of the liquid, and then substitute the peak current value into the electrochemical response standard curve to obtain the content of mesotrione in the liquid to be tested, and finally, obtain the residual amount of mesotrione in corn through conversion. The above-mentioned detection method for mesotrione ...
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