Solid-phase extracting method of furfural component in transformer insulating oil
A technology of transformer insulating oil and furfural, which is used in instruments, scientific instruments, material separation, etc., can solve problems such as easy emulsification, and achieve the effects of satisfying quantitative analysis requirements, stable extraction rate, and high extraction rate.
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Embodiment 1
[0026] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:
[0027] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;
[0028] 2) Take 7mL of 100% chromatographically pure n-hexane with a medical glass needle, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;
[0029] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;
[0030] 4) Take 25mL of 100% chromatographically pure hexane with a medical glass needle, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furfural c...
Embodiment 2
[0033] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:
[0034] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;
[0035] 2) Use a medical glass needle to take 3mL of 100% chromatographically pure n-hexane, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;
[0036] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;
[0037] 4) Use a medical glass needle to take 15mL of 100% chromatographically pure n-hexane, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furf...
Embodiment 3
[0040] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:
[0041] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;
[0042] 2) Use a medical glass needle to take 5mL of 100% chromatographically pure n-hexane, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;
[0043] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;
[0044] 4) Use a medical glass needle to take 20mL of 100% chromatographically pure n-hexane, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furf...
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