Automatic pretreatment device for PAH (polycyclic aromatic hydrocarbon) sample in PM2.5

Abstract

An automatic pretreatment device for a PAH (polycyclic aromatic hydrocarbon) sample in PM2.5 comprises an injection pump, an eight-position selection valve, a buffer coil, a liquid distribution pipe, solution utensils and a liquid chromatograph, wherein the injection pump is connected to the eight-position selection valve through the buffer coil, eight rotation positions including A, B, C, D, E, F, G and H are arranged on the eight-position selection valve and are connected to the corresponding solution utensils or the liquid chromatograph through the liquid distribution pipe, and the solution utensils comprise an extraction bottle, a waste liquid bottle, an extraction reagent bottle, an elution reagent bottle, a phase change bottle and a polar solvent bottle. With the combination of the system design including the injection pump, the buffer coil and the multi-position valve, automatic complex operation is realized, the operation consistency during solid-phase extraction is realized, and the analysis precision is improved.

Description

technical field [0001] The invention relates to the technical field of solid phase extraction and fluid automatic control, in particular to an automatic pretreatment device for samples of polycyclic aromatic hydrocarbons in PM2.5. Background technique [0002] Among the organic compounds in PM 2.5, polycyclic aromatic hydrocarbons (PAHs) are carcinogenic, teratogenic, and mutagenic substances, and are the most harmful. [0003] Due to the semi-volatile and non-volatile characteristics of PAHs, HPLC is usually used to achieve qualitative and quantitative detection. Modern chemical analysis technology is developing more and more fast, trace, accurate and automatic. The analysis time of samples is greatly shortened and can be completed within 20-30 minutes. However, in the pretreatment of samples, the steps are often cumbersome, so samples The effect of pre-processing often determines the success or failure of the detection work. At present, there are two main sample pretreat...

AI Technical Summary

Problems solved by technology

The Soxhlet extraction method is mature, but it takes a long time and requires a large amount of extractant. It needs to be done manually, which is time-consuming and laborious.

Compared with the Soxhlet extraction method, the ultrasonic extraction method shortens the time, but like the Soxhlet extraction method, a large amount of solvent consumption and waste liquid treatment

The two methods are mainly completed by manual operation, which has high requirements for the operator, and the extractant often has certain toxicity, which endangers the health of the operator.

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