Method for determining fatty aldehyde in drainage oil
A measurement method and technology of gutter oil, applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effect of sensitive judgment
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Embodiment 1
[0048] Sample pretreatment: Add 500 mL of 10% NaOH to 300 mL of waste oil to remove its soaps, then add 10% NaCl solution to remove excess lye and accelerate the separation of oil and soap, heat 30 g of activated clay at 70 °C for 30 minutes to decolorize, and then Filter to remove activated clay, add 10 g MgSO 4 dehydration. 50 mL of refined waste oil was dissolved in 80 mL of n-hexane, and the sample was loaded on a 50 g treated silica gel column. First eluted with a mixed solution of 550 mL of n-hexane and ethyl acetate (10:1, V / V) to remove hydrophobic substances, then added 500 mL of ethanol for elution, and concentrated the two parts of the eluate to remove the solvent Reserved for later use.
[0049] Sample preparation: Take a mixture of n-hexane and ethyl acetate (10:1, V / V) to concentrate the eluent 1 mL, add 1 mL of absolute ethanol, then add 1 mL of dichloromethane, the sample is completely dissolved and diluted as a blank Sample. Take 1 mL of concentrated eluen...
Embodiment 2
[0053] 50 mL of the first-grade Luhua peanut oil was dissolved in 80 mL of n-hexane and loaded on a 50 g treated silica gel column. First elute with 550 mL of a mixed solution of n-hexane and ethyl acetate (10:1, V / V) to remove hydrophobic substances, then add 500 mL of ethanol for elution, and concentrate the two parts of the eluate to remove the solvent Reserved for later use.
[0054] Sample preparation: Take a mixture of n-hexane and ethyl acetate (10:1, V / V) to concentrate the eluent 1 mL, add 1 mL of absolute ethanol, then add 1 mL of dichloromethane, the sample is completely dissolved and diluted as a blank sample . Take 1 mL of concentrated eluent for ethanol elution, add 1 mL of absolute ethanol, add 1 mL of dichloromethane, and then add excess 0.5 mL of 2,4-dinitrophenylhydrazine as the actual sample.
[0055] Liquid chromatographic determination: a set of Shimadzu chromatograph, including one LC-10ATvp chromatographic pump, one 2487 multi-wavelength ultraviolet de...
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