Improved method for rapid detection of formaldehyde content
A formaldehyde content, fast technology, applied in the measurement device, color/spectral property measurement, preparation of test samples, etc., can solve problems such as harm to consumers' health, and achieve the effect of eliminating interference, high sensitivity, and simple operation
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Embodiment 1
[0017] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:
[0018] S1. Take 15g of the food sample to be tested, after ultrasonic crushing, add 35g of double distilled water at a speed of 580r / min, mix and dissolve at a high speed for 40min, then add 55g of 48% ethanol solution, let it stand for 1.5h, and separate Formaldehyde solution A;
[0019] S2. Dissolve dibenzothiophene in chloroform according to the mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 250r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 12 minutes, it was ultrasonically dissolved for 30 minutes, heated to 65°C, reacted for 20 hours, and then washed with excess ethanol solution and methanol and acetic acid mixture with a mass ratio of 1:1 for 25 minutes to obtain silica gel surface molecules To imprint the polymer, add...
Embodiment 2
[0023] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:
[0024] S1. Take 20g of the food sample to be tested, after ultrasonic crushing, add 40g of double distilled water at a speed of 480r / min, mix and dissolve at high speed for 50min, then add 65g of 55% ethanol solution, let it stand for 2h, and separate formaldehyde-containing Solution A;
[0025] S2. Dissolve dibenzothiophene in chloroform at a mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 200r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 8 minutes, it was ultrasonically dissolved for 35 minutes, heated to 76°C, reacted for 18 hours, and then washed with excess ethanol solution and a mixture of methanol and acetic acid with a mass ratio of 1:1 for 20 minutes to obtain silica gel surface molecules To imprint the polymer, add ...
Embodiment 3
[0029] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:
[0030] S1. Take 25g of the food sample to be tested, after ultrasonic crushing, add 45g of double distilled water at a speed of 680r / min, mix and dissolve at high speed for 30min, then add 75g of 38% ethanol solution, let it stand for 1h, and separate formaldehyde-containing Solution A;
[0031] S2. Dissolve dibenzothiophene in chloroform according to the mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 300r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 8 minutes, it was ultrasonically dissolved for 40 minutes, heated to 58°C, reacted for 22 hours, and then washed with excess ethanol solution and a mixture of methanol and acetic acid with a mass ratio of 1:1 for 15 minutes to obtain silica gel surface molecules To imprint the p...
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