Detection method for element content in egg yolk powder, and sample pre-treatment method thereof
A technology for sample pretreatment and element content, applied in the preparation of test samples, etc., can solve problems such as low recovery rate and inaccurate detection, achieve high recovery rate, simple and fast operation, and avoid equipment damage.
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Embodiment 1
[0018] Sample pretreatment:
[0019] 1. Weigh 0.5822g of egg yolk powder to be tested in a digestion tank, add 5mL of concentrated nitric acid with a volume percentage concentration of 65%, to obtain an acidified sample solution;
[0020] 2. Let the acidified sample solution stand for 8 minutes to obtain the acidified solution after standing;
[0021] 3. Add 3 mL of 36% hydrogen peroxide aqueous solution to the acidified solution after standing, and mix well to obtain the oxidized sample mixture;
[0022] 4. Transfer the oxidized sample mixture into the microwave digestion equipment for normal pressure digestion; the maximum power of the microwave digestion equipment is 1600W, and the heating program is set as: first heat for 8 minutes, then raise the oxidized sample mixture from room temperature to 120°C, keep 2 minutes; heat for another 5 minutes, raise the oxidized sample mixture from 120°C to 150°C, and keep for 5 minutes; finally heat for 8 minutes, raise the oxidized sa...
Embodiment 2
[0027] Sample pretreatment:
[0028] 1. Weigh 0.7021g of the egg yolk powder to be tested in a digestion tank, add 6mL of concentrated nitric acid with a concentration of 65% by volume to obtain an acidified sample solution;
[0029] 2. Let the acidified sample solution stand for 5 minutes to obtain the acidified solution after standing;
[0030] 3. Add 3 mL of 38% hydrogen peroxide aqueous solution to the acidified solution after standing, and mix well to obtain the oxidized sample mixture;
[0031] 4. Transfer the oxidized sample mixture into the microwave digestion equipment for normal pressure digestion; the maximum power of the microwave digestion equipment is 1600W, and the heating program is set as: first heat for 8 minutes, then raise the oxidized sample mixture from room temperature to 120°C, keep 2 minutes; heat for another 5 minutes, raise the oxidized sample mixture from 120°C to 150°C, and keep for 5 minutes; finally heat for 8 minutes, raise the oxidized sample ...
Embodiment 3
[0036] Sample pretreatment:
[0037] 1. Weigh 0.6534g of egg yolk powder to be tested into a digestion tank, add 5.5mL of concentrated nitric acid with a concentration of 65% by volume to obtain an acidified sample solution;
[0038] 2. Let the acidified sample solution stand for 5 minutes to obtain the acidified solution after standing;
[0039] 3. Add 2.5 mL of 37% hydrogen peroxide aqueous solution to the acidified solution after standing, and mix well to obtain the oxidized sample mixture;
[0040] 4. Transfer the oxidized sample mixture into the microwave digestion equipment for normal pressure digestion; the maximum power of the microwave digestion equipment is 1600W, and the heating program is set as: first heat for 8 minutes, then raise the oxidized sample mixture from room temperature to 120°C, keep 2 minutes; heat for another 5 minutes, raise the oxidized sample mixture from 120°C to 150°C, and keep for 5 minutes; finally heat for 8 minutes, raise the oxidized sampl...
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