Array surface acoustic wave paper-based microfluidic system for rapid detection of heavy metal ion concentration

Abstract

The invention relates to an array surface acoustic wave paper-based microfluidic system for rapidly detecting heavy metal ion concentration. The system comprises a substrate; a paper-based electrochemical three-electrode system is arranged on the upper surface of the substrate; two sides of the paper-based electrochemical three-electrode system are provided with array linear interdigital transducers; the lower surface of the substrate is provided with a diaphragm; and the diaphragm is provided with a temperature control structure corresponding to the position of the paper-based electrochemicalthree-electrode system. When the system is used, a cyclic volt-ampere detection program carried in a smart phone sends digital signals; the digital signals are converted into voltage signals througha Bluetooth module, a micro controller and a digital-to-analog conversion module; a potentiostat for electrochemical measurement is controlled to apply a voltage to the paper-based electrochemical three-electrode system; the paper-based electrochemical three-electrode system undergoes an oxidation-reduction reaction, so that current signals can be obtained; the current signals are converted into digital signals through the potentiostat for electrochemical measurement and the micro controller; and the digital signals are outputted to the cyclic volt-ampere detection program carried in the smartphone through the Bluetooth module, so that a cyclic volt-ampere curve graph can be obtained. The system of the invention has the advantages of capability of realizing precise control, high simplicity, high portability and high efficiency.

Description

technical field [0001] The invention relates to the technical field of micro-nano manufacturing, in particular to an array surface acoustic wave paper-based microfluidic system for rapidly detecting the concentration of heavy metal ions. Background technique [0002] Environmental pollution caused by heavy metal ions is a global problem. Heavy metal ions accumulate in the human body and cause serious health problems by generating free radicals. Therefore, how to quickly and accurately detect the concentration of heavy metal ions has become an urgent problem. The paper-based analysis device has the advantages of low cost, less reagent consumption, simple operation, and portability. It is widely used in environmental detection, but it only relies on capillary force to drive the liquid to react on the paper base. In the case of no pumping, the liquid The flow is slow, the analysis time is too long, the volatilization of the solution on the substrate will cause quantitative ana...

AI Technical Summary

Problems solved by technology

The paper-based analysis device has the advantages of low cost, less reagent consumption, simple operation, and portability. It is widely used in environmental detection, but it only relies on capillary force to drive the liquid to react on the paper base. In the case of no pumping, the liquid The flow is slow, the analysis time is too long, the volatilization of the solution on the substrate will cause quantitative analysis deviation, affect the concentration detection accuracy, and lack of real-time display and output of the detection results after sampling detection, so the development of a simple structure, combined with paper base to promote liquid At the same time, the small size, portable, and overall heavy metal ion detection system are of great significance

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