A pressurized solid phase extraction device

Abstract

The invention belongs to the technical field of pretreatment of an analytical chemistry experiment, and relates to a pressurization solid phase extraction device for sample pretreatment. The device comprises two parts including a pipetting assembly and an extraction and elution component, wherein the pipetting assembly is formed by a plurality of arranged pipetting channels; each pipetting channel comprises a sample cup, an injection pump, a first one-way valve, a second one-way valve, a movable connecting head, a first teflon tube and a second teflon tube; the extraction and elution component comprises column bolts, solid-phase extraction columns and a collector; the number of the column bolts corresponds to that of the movable connecting heads; all the column bolts correspond to the solid-phase extraction columns one by one, and can be respectively inserted into the solid-phase extraction columns; each column bolt is provided with a flow through hole, and medium can flow into the corresponding solid-phase extraction column through the flow through hole; the collector is arranged under the solid-phase extraction columns and is used for collecting the medium discharged by the solid-phase extraction columns. The pressurization solid-phase extraction device can provide stable and accurate flow speed, is capable of treating a great deal of samples once, can basically realize complete sample introduction, and can be used for treating the plurality of samples at the same time.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of analytical chemistry experiments. The invention can separate target substances to be analyzed, such as organic pesticides, polycyclic aromatic hydrocarbons, etc., from extracts such as food, medicine, soil, biological samples, etc., and enter into the next step of analysis and detection. , which belongs to a pressurized solid phase extraction device for sample pretreatment. Background technique [0002] Solid-phase extraction (Solid-Phase Extraction, SPE for short) is a sample pretreatment technology developed in recent years. It is developed from the combination of liquid-solid extraction and column liquid chromatography technology. Compared with the traditional liquid-liquid extraction method, sample enrichment and purification can be completed at the same time, greatly improving the detection sensitivity, and it is faster than liquid-liquid extraction, saves more solvent, and can be pro...

AI Technical Summary

Problems solved by technology

[0010] There are also fully automatic solid-phase extraction devices realized by different principles on the market, which mainly solve the problem of transferring liquid to the solid-phase extraction column, but they are expensive and have more or less technical defects

The most commonly used one is an automatic solid-phase extraction device that uses an upright syringe pump to provide pipetting power and the X-Y-Z axis movement and positioning of the pipetting needle. If it is completely blotted dry, the sample will more or less remain at the bottom of the sample container; when processing a sample with a sample volume of 20ml-200ml, it takes a lot of time to move the pipette needle back and forth, resulting in a rather long processing time

The other is an automatic solid-phase extraction device that uses an upright syringe pump to provide pipetting power and a selector valve to select samples or solvents. This kind of pipeline is relatively long, and it is also difficult to achieve complete sample injection.

There is also a fully automatic solid-phase extraction device on the market that uses air pressure to provide power for pipetting. The sample or solvent is pressed into the solid-phase extraction column at a constant flow rate, and the sample can be completely injected, but once the column is slightly blocked, the gas will be compressed. , resulting in an unstable flow rate

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