Method for simultaneously determining contents of various positive ions in tobacco
A cation and tobacco technology, applied in the field of chromatographic analysis, can solve problems such as blanks in the study of lithium content, and achieve the effects of simple sample pretreatment, good repeatability, and saving man-hours
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Embodiment 1
[0068] The detection of the standard sample in the method for simultaneously measuring multiple cation contents in tobacco of the present embodiment is carried out according to the following steps:
[0069] (1) Standard solution sample preparation conditions:
[0070] Using a polytetrafluoroethylene (PETT) volumetric flask, Li was prepared with the extractant + 、Na + , NH 4 + 、K + , Mg 2+ , Ca 2+ The ion concentration is 2μg / mL standard solution.
[0071] The extractant is:
[0072] Methanol: ethanol: sulfuric acid: water, mix according to 300mL: 200mL: 2mL: 1000mL.
[0073] After shaking at room temperature for 10 minutes, the extractant passed through a 0.22 μm polyethersulfone (PES) filter membrane, and the filtered extractant was collected as a sample and placed in an ion chromatography vial for detection.
[0074] (2) Sample ion chromatography IC detection conditions:
[0075] Chromatographic column: CS12A analytical column equipped with CG12A guard column; flow...
Embodiment 2
[0079] The method for simultaneously measuring multiple cation contents in tobacco of the present embodiment is carried out as follows:
[0080] (1) Sample pretreatment: Tobacco A (flue-cured tobacco), all samples before the experiment were sealed and stored in the refrigerator (-18°C). Before analysis, the samples to be analyzed were thawed at room temperature for 1 hour, and then dried at 30-50°C. Dried, pulverized, and then passed through a 40-mesh sieve to obtain pretreated tobacco A;
[0081] (2) Sample extraction: Accurately weigh 0.3g of pretreated tobacco A (flue-cured tobacco sample), put it into a 50mL stoppered polytetrafluoroethylene triangular flask, add 20mL of extraction agent, shake and extract at room temperature for 30min, after standing for 5min, extract Filter through a 0.22 μm hydrophilic polyvinylidene fluoride (PVDF) filter membrane, collect the filtered extract as a sample and place it in an ion chromatography bottle for detection.
[0082] Among them,...
Embodiment 3
[0099] The method for simultaneously measuring multiple cation contents in tobacco of the present embodiment is carried out in the following steps:
[0100](1) Sample pretreatment: Tobacco B (burley tobacco), all samples before the experiment were sealed and stored in the refrigerator (-18°C), and the samples to be analyzed were thawed at room temperature for 1 hr before analysis, and then dried at 50°C Dried, pulverized, and then passed through a 40-mesh sieve to obtain pretreated tobacco B;
[0101] (2) Sample extraction: Accurately weigh 1.2g of pretreated tobacco B, put it into a 250mL stoppered polyethylene triangular flask, add 100mL of extraction agent, shake and extract at room temperature for 40min, after standing for 2min, the extract is passed through a 0.22μm polyether Sulfone (PES) filter membrane was used for filtration, and the filtered extract was collected as a sample and placed in an ion chromatography vial for detection.
[0102] Among them, the extractant ...
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