The invention discloses a detection method and a kit of illegal cooking oil as well as a production method of a detection color comparison card. The detection method comprises the following steps: dripping detected oil onto a silica gel plate, spreading the detected oil on the silica gel plate through a developing agent, spraying a color developing agent for color development, comparing the color of the detected oil with a standard color comparison card, observing if the detected oil exceeds the standard according to the motion trail and the color change, and if the detected oil exceeds the standard, judging that the detected oil is fried illegal cooking oil, wherein the developing agent comprises petroleum ether, ethyl ether and acetic acid in a volume ratio of (60-70) to (20-30) to (5-10). The detection kit comprises the standard color comparison card, the G-type silica gel plate, the developing agent and the color developing agent. The method adopts a simple operation process and can be used for quickly and accurately identifying the illegal cooking oil.

Detection method and kit of illegal cooking oil as well as production method of detection color comparison card

The invention discloses a method for measuring methylal in gasoline. The method comprises the steps of firstly, preparing an inorganic acid aqueous solution and an inorganic base aqueous solution which are to be used as an acidizing reagent and a basifying reagent; mixing the gasoline and water according to the volume ratio of 5 to 10:1 to enable the methylal in the gasoline to be extracted into an aqueous phase, and then standing to stratify an oil phase and the aqueous phase; taking out of the aqueous phase subjected to stratifying by standing, adding the prepared acidizing reagent, reacting for 3 to 5 minutes in a water bath at the temperature of 40 to 80 DEG C to cause the methylal in the aqueous phase to be acidified and decomposed into methyl alcohol and formaldehyde; finally, adding the prepared basifying reagent into the reacted solution to constructing an alkaline environment, adding a formaldehyde color reagent, and uniformly shaking to enable the formaldehyde to react with the formaldehyde color reagent; if the color of a reaction solution changes, the detected gasoline sample contains the methylal. The method provided by the invention has the characteristics that the operation is simple, the analysis speed is quick, the capacity of resisting disturbance is high, and the reagents are common, and is especially suitable for law-enforcement anti-fake personnel to carry out field tests.

Method for measuring methylal in gasoline

A method for detecting illegal cooking oil in a radioactive measurement mode comprises two detecting methods which are beta, gamma and alpha counting rate measurement conducted on oil and beta, gamma and alpha spectrometry conducted on the oil. The beta, gamma and alpha counting rate measurement or spectrometry is conducted on radioactive nuclides of 210Pb, 210Bi and 210Po which are all contained in vegetable oil, so that the threshold values of the beta, gamma and alpha counting rates or the threshold values of the activity and the concentration in the vegetable oil are obtained and serve as oil quality identification standards; the beta, gamma and alpha counting rate measurement or spectrometry is conducted on the radioactive nuclides of 210Pb, 210Bi and 210Po contained in the oil to be detected, so that the threshold values of the beta, gamma and alpha counting rates or the threshold values of the activity and the concentration in the oil to be detected are measured, the threshold values of the beta, gamma and alpha counting rates or the threshold values of the activity and the concentration are compared with the oil quality identification standards, and if any item of the threshold values of the beta, gamma and alpha counting rates or the threshold values of the activity and the concentration in the oil to be detected is higher than that of the vegetable oil quality identification standards, the oil is illegal cooking oil.

Method for detecting illegal cooking oil in radioactive measurement mode

Reagent composition used for detecting illegal cooking oil, and application thereof

The invention relates to the technical field of detection of hogwash oil and particularly relates to a detection reagent of hogwash oil, a preparation method of the detection reagent and a method for detecting hogwash oil The detection reagent comprises the following components in percentage by volume: 10-20% of orthophenanthroline solution, 10-20% of ammonium acetate buffer solution, 10-20% of hydroxylamine hydrochloride iron solution and 40-60% of dichloromethane According to the invention, the defects of the existing detection technology can be overcome, and a rapid screening method which is applicable to field supervision inspection and low in analysis cost is established The rapid screening method is fast, simple and convenient, and the whole operation process comprises the following steps: preparing a color developing solution for 2 minutes and extracting an oil sample for 17 minutes, and then adding the detection reagent into the color developing solution to perform color development, wherein the whole operation process is finished within 20 minutes The method does not need a comparison product and precise instruments, and has the advantages of low analysis cost, and simplicity and fastness in operation, so that the method is applicable to the field supervision and inspection; and by virtue of the method, the hogwash oil which is checked to be qualified by the existing national standards can be detected, thereby making up the defects of the existing national standards

Detection reagent of hogwash oil, preparation method of detection reagent and method for detecting hogwash oil

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Detection reagent of hogwash oil, preparation method of detection reagent and method for detecting hogwash oil