Pretreatment system for water sample

Abstract

The invention provides a pretreatment system for a water sample. The pretreatment system comprises a sample introduction unit, a primary liquid storage unit, a secondary liquid storage unit, enrichingunits and a nitrogen blowing concentrating unit, wherein the sample introduction unit comprises a funnel and a water conveying pipe which are connected with each other, and a filter is arranged in the water conveying pipe; the water conveying pipe is connected with the primary liquid storage unit; the secondary liquid storage unit comprises three or more liquid storage devices, the enriching units comprise three or more enriching columns, the liquid storage devices and the enriching columns are connected in a one-to-one correspondence manner through pipelines and valves, filter membranes arearranged at inlets of the liquid storage devices, and the inlets of the liquid storage devices are connected with the primary liquid storage unit through pipelines and valves; the enriching columns are connected with the nitrogen blowing concentrating unit. The system provided by the invention is simple in use and high in treatment efficiency, pretreatment work can be completed by using differentenriching units according to water sample detection requirements, the pretreatment of minute pollutants of different properties is synchronously achieved in the same reaction system, the pretreatmenteffect is remarkably improved, the energy consumption is remarkably lowered, the reactor structure is optimized, and the floor area is reduced.

Description

technical field [0001] The invention belongs to the field of water environment detection, in particular to a water sample pretreatment system. Background technique [0002] Due to the abuse of various drugs and the incomplete treatment of existing processes in urban sewage treatment plants, in recent years, various drugs have been frequently detected in water sources such as rivers, lakes, groundwater, and municipal sewage, although their concentrations are mostly in ng / L to μg / L, but the long-term occurrence of these substances may cause potential harm to the ecosystem. Existing analytical instruments cannot directly perform quantitative detection on water samples, and the water samples need to be pre-treated. Therefore, the analysis and detection technology of water environmental samples usually consists of two parts: sample pretreatment technology and instrument quantitative analysis technology. Through the water sample pretreatment technology, the trace components to b...

AI Technical Summary

Problems solved by technology

However, the operation of liquid-liquid extraction is cumbersome, requires a large amount of solvent consumption, high cost, causes environmental pollution, and the absolute recovery rate is low; dispersion liquid-liquid microextraction is greatly affected by pH, and the selection of organic solvents requires high requirements; solid-phase extraction requires The use of solid-phase extraction devices and extraction cartridges is costly; solid-phase microextraction has relatively low sensitivity, and it is necessary to find suitable derivatization conditions

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