A method for obtaining natural matrix positive materials of flue-cured tobacco physical standard samples containing carbendazim residues
An acquisition method and natural matrix technology, which is applied in the field of acquisition of natural matrix positive materials of flue-cured tobacco physical standard samples containing carbendazim residues, can solve problems such as incomplete consistency, residues, extraction, and purification behaviors are different from real test samples, and achieve Guaranteed consistency, excellent stability, and easy access to the effect
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Embodiment 1
[0030] ——Acquisition of natural matrix positive materials of flue-cured tobacco physical standard samples containing carbendazim residues
[0031] Experimental location: Huangguan Modern Tobacco Agriculture Professional Cooperative, Hongta District, Yuxi City, with an experimental area of 166m 2 .
[0032] Experimental Materials:
[0033] 1) Tobacco plants: The variety is Yunyan 87, the row spacing of the tobacco plants is 50cm*120cm, and the tobacco plants grow well according to the normal management of the local tobacco leaf production technology.
[0034] 2) Reagent: 25% carbendazim wettable powder, Sichuan Guoguang Agrochemical Co., Ltd.
[0035] 3) Instruments: ultra-high performance liquid chromatography (Waters, USA), AB Sciex QTRAP 5500 mass spectrometer (AB Sciex, USA).
[0036] experimental method:
[0037] 1) Application: application weather: sunny. Application method: uniform spray method, 166m 2 A total of 15L of the prepared carbendazim aqueous solution w...
Embodiment 2
[0051] ——Study on the uniformity of the natural matrix positive material of the flue-cured tobacco physical standard sample containing carbendazim residue
[0052] Experimental Materials:
[0053] 1) Sample: the sample prepared according to the method described in Example 1, and the sampling time was November 2013.
[0054] 2) Reagent: Same as Example 1.
[0055] 3) Instrument: Same as Example 1.
[0056] experimental method:
[0057] Put the roasted, crushed, sieved, and mixed tobacco leaf powder into brown sample bottles, 10g per bottle, and affix a numbered sample label. Sampling method: number the sample bottles sequentially, and randomly select 18 samples using a random number table. bottle, each bottle is detected 3 times, and the detection method is the same as in Example 1. The results were statistically analyzed for uniformity by the F test method, and the test data results and variance analysis results are shown in Table 1 and Table 2. F value of carbendazim res...
Embodiment 3
[0063] ——Study on the stability of the natural matrix positive material of the flue-cured tobacco physical standard sample containing carbendazim residue
[0064] Experimental Materials:
[0065] 1) Samples: samples prepared according to the method described in Example 1, and the sampling time was collected monthly from January 2014 to December 2014.
[0066] 2) Reagent: Same as Example 1.
[0067] 3) Instrument: Same as Example 1.
[0068] experimental method:
[0069] Put the roasted, crushed, sieved and mixed tobacco leaf powder into sample bottles, 10g per bottle, affix a numbered sample label, store at -20°C, and sample once a month for a total of 12 months , since the measurements are carried out under (in-laboratory) reproducible conditions, which also include measurement instability. The results of the long-term stability study are shown in Table 3 and Table 4. The results show that all p values are greater than 0.05, indicating that the regression is not signif...
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