Surface enhanced Raman detection method for detecting doping situation of quinazarin dye in diesel oil

Abstract

The invention discloses a surface enhanced Raman detection method for detecting whether diesel oil is doped with quinazarin dye. The method comprises the following steps: adding acetonitrile into a diesel oil sample to be detected, performing oscillating, performing centrifuging, and taking supernatant; adding an alkaline reagent into the supernatant, performing oscillating, and performing standing to obtain a standing solution; adding a salt reagent into the standing liquid, performing oscillating and centrifuging, and taking lower clear liquid; uniformly mixing the lower clear liquid with nano-gold or nano-silver sol prepared in advance and an agglomeration agent prepared in advance, and performing detecting by using a Raman spectrometer to obtain a Raman spectrogram; and judging whethera to-be-detected diesel oil sample is doped with quinazarin dye or not according to the obtained Raman spectrogram. Whether quinazarin exists in a sample or not can be accurately judged from the molecular level by means of the Raman spectrum principle, alive diesel (red oil) and a normal sample are effectively distinguished, and the method has the advantages of being obvious in distinction degree, easy and convenient to pretreat the sample, small in dosage, rapid, easy and convenient to implement, high in precision, low in detection limit, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of public safety detection, and in particular relates to a surface-enhanced Raman detection method for detecting whether diesel oil is mixed with quinazine dye. Background technique [0002] "Red oil" refers to a kind of duty-free diesel oil used for fishing boats and other ships in Hong Kong. In order to distinguish it from vehicle oil, a red dye: quinazine is specially added to it. Because it is a duty-free product, there is a price difference with normal refined oil, so some criminals smuggle it into the mainland and sell it as ordinary diesel to make illegal profits. Especially in recent years, smugglers have adopted a more concealed "red oil" smuggling method, adding a small amount of black dye to the "red oil", so that the "red oil" quickly changed from the unique red to dark brown. [0003] The method for quickly identifying whether diesel oil is mixed with quinizarin dye: the traditional color devel...

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Problems solved by technology

[0003] The method for quickly identifying whether diesel oil is mixed with quinizarin dye: the traditional color development principle is adopted, which is easily affected by other interfering substances; the detection limit is high, which cannot meet the actual detection needs. The content may be relatively low, but the detection limit of "SNT 1788-2006 Determination of Quinizarin Extraction Spectrophotometry" and other methods can only be as low as 0.04mg / L

[0004] The existing detection methods are mainly spectrophotometry and colorimetry, but their basic principles are the same. They are all used to detect after they react with alcohols to a certain color under strong alkaline conditions, but they need to use dangerous substances such as strong alkalis. , and the specificity of the method is poor, it is susceptible to interference, and it is impossible to identify whether there are quinarizarin substances at the molecular level

In addition, smugglers will decolorize the red oil to achieve the purpose of bluffing through customs. Therefore, the content of quinarisin in the actual sample is relatively low, and the detection limit of traditional methods cannot meet the detection requirements, which may cause missed detection and misjudgment

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