Method for rapidly determining whether quinizarin dye is doped in diesel oil

Abstract

A method for rapidly determining whether the quinizarin dye is doped in the diesel oil, comprises: adding a certain amount of chilli oil sample in which the black coloring agent is doped into a colorimetric tube, adding 50 g / l NaOH solution accounting for 10% of the chilli oil sample volume and n-butanol accounting for 10% of the chilli oil sample volume, adding quinizarin solubilizer accounting for 7-15% of the chilli oil sample volume, performing the ultrasonic treatment for 2 to 5 min and layering, determining the quinizarin is contained and the sample is chilli oil if the indigo water layer exists, wherein the quinizarin solubilizer is 0.05 to 0.15 g / mL Na2S2O3 saturated Na2S solution. The invention has the advantages of few consumption, short time and high efficiency. The method can rapidly determine whether the quinizarin dye is doped in the diesel oil, and the result is reliable.

Description

technical field [0001] The invention relates to a method for identifying diesel oil, in particular to a method for identifying whether diesel oil is mixed with quinirin pigment. Background technique [0002] Adding dyes with quinasizarin as the main component in ordinary diesel oil makes the color change from light yellow to clear red, which is called "red oil", which is a common name for industrial diesel in Hong Kong. Since this type of diesel oil is duty-free in Hong Kong, its price is lower than that of ordinary diesel oil. After smuggling imported, the profit obtained is obviously higher than that of other diesel oil. It has become the main method of smuggling diesel oil. Therefore, smuggled diesel oil is generally called " "Red Oil". [0003] For this kind of "red oil", there is currently no effective rapid qualitative identification method, especially in recent years, in order to conceal the smuggling of "red oil", smugglers have mixed a small amount of black dye int...

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Problems solved by technology

[0003] For this kind of "red oil", there is currently no effective rapid qualitative identification method, especially in recent years, in order to conceal the smuggling of "red oil", smugglers have mixed a small amount of black dye into the "red oil" to make the red oil It soon changed from the unique red color to dark brown. This kind of smuggled diesel oil could not be identified as containing quinizarin dye by conventional analysis methods, which brought more difficulties to the anti-smuggling of "red oil". There is no rapid identification method for the detection of quinizarin in diesel fuel mixed with black dye in such "red oil"