A kind of detection method of glycidyl ester in oil
A technology of glycidyl ester and detection method, which is applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve the problems of troublesome operation, high cost, long time required, etc., and achieves low cost, low detection cost, The effect of high sensitivity and accuracy
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Embodiment 1
[0028] Preparation of Standard Curve
[0029] (1) Accurately weigh 50mg of 2,4-dinitrophenylhydrazine into a 100mL volumetric flask, and dilute to the mark with ethanol to obtain solution A. Accurately weigh 100mg of glycidyl ester into a 100mL volumetric flask, and dilute to the mark with dichloromethane to obtain liquid B. Accurately weigh 4g of potassium hydroxide in a 100mL volumetric flask, and dilute to the mark with ethanol to obtain liquid G.
[0030] (2) Take four 10mL volumetric flasks, accurately weigh 0.5mL of liquid B into a 10mL volumetric flask, and dilute to the mark with dichloromethane to obtain liquid C. Accurately weigh 2mL, 4mL and 6mL of C solution into a 10mL volumetric flask, and dilute to the mark with dichloromethane, respectively as D solution, E solution and F solution.
[0031] (3) Accurately weigh 10 mg of aluminum chloride into a 15 mL round-bottomed flask with a stopper, then add 5 mL of dichloromethane and place it on a constant temperature m...
Embodiment 2
[0033] Sample testing
[0034] (1) Oil sample blank detection:
[0035] ① Accurately weigh 50mg of 2,4-dinitrophenylhydrazine into a 100mL volumetric flask, and dilute to the mark with ethanol to obtain liquid A. Accurately weigh 4g of potassium hydroxide in a 100mL volumetric flask, and dilute to the mark with ethanol to obtain liquid G.
[0036] ② Accurately weigh 5mL of dichloromethane into a 15mL round bottom flask with a stopper, place it on a constant temperature magnetic stirrer and stir thoroughly for 1h. After that, 1ml of oil sample was added, and the catalytic time for complete reaction was 60min, and the temperature was -20°C. Afterwards, accurately draw 1mL of the catalytic product and 1mL of solution A into dry stoppered colorimetric tubes, shake well, place in a constant temperature water bath, set the temperature to 45°C, and the reaction time is 30min (2,4-dinitro phenylhydrazine to detect the reaction conditions of carbonyl compounds), after the complete r...
Embodiment 3
[0048] Preparation of Standard Curve
[0049](1) Accurately weigh 50mg of 2,4-dinitrophenylhydrazine into a 100mL volumetric flask, and dilute to the mark with ethanol to obtain solution A. Accurately weigh 100mg of glycidyl ester into a 100mL volumetric flask, and dilute to the mark with dichloromethane to obtain liquid B. Accurately weigh 4g of potassium hydroxide in a 100mL volumetric flask, and dilute to the mark with ethanol to obtain liquid G.
[0050] (2) Take four 10mL volumetric flasks, accurately weigh 0.5mL of liquid B into a 10mL volumetric flask, and dilute to the mark with dichloromethane to obtain liquid C. Accurately weigh 2mL, 4mL and 6mL of C solution into a 10mL volumetric flask, and dilute to the mark with dichloromethane, respectively as D solution, E solution and F solution.
[0051] (3) Accurately weigh 10mgZrCl 4 In a 15 mL stoppered round-bottom flask, add 5 mL of dichloromethane and place it on a constant temperature magnetic stirrer to fully stir ...
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