Filter paper-based colorimetric sensor array for trace heavy metal ion detection method

Abstract

The present invention is a method for the detection of multiple trace heavy metal ions by a colorimetric sensor array: draw unique hydrophilic channels on quantitative filter paper by means of a wax spray printer, and fix several heavy metal ion indicators on each hydrophilic channel respectively. The indicator array is formed in the water channel, and each channel is terminated with a water-absorbing unit fixed with a polymer water-absorbing material. The heavy metal ion solution reacts with the indicator through the hydrophilic channel, and at the same time, it is absorbed by the back-end polymer material. , so that the heavy metal ion solution can continuously flow through the indicator and enrich the reaction, so as to achieve the purpose of semi-quantitative determination of the eight kinds of trace heavy metal ions in water. Use a color imaging device to collect the color changes of the indicator before and after different heavy metal ions, and construct a "fingerprint" of each heavy metal ion. During the testing process, the method of mathematical statistics is used to compare the sample spectrum with the "fingerprint spectrum" library, so as to conduct qualitative or semi-quantitative analysis of unknown heavy metal ions.

Description

technical field [0001] The invention relates to a sensor, in particular to a method for detecting various trace heavy metal ions in water with a colorimetric sensor array based on filter paper. Background technique [0002] In recent years, a series of environmental problems brought about by the rapid development of the global industrial economy have caused serious harm to the balance of ecosystems and human health, which has attracted widespread attention. Water is the source of human life, and it is closely related to the harmonious and unified development of nature and human beings. Therefore, the pollution of water resources has become one of the hot issues in the environmental field. Among the many water pollutions, heavy metal pollution accounts for a considerable proportion. In view of its characteristics of being easily bioaccumulated, biomagnifying, and toxic, the timely early warning, rapid analysis and detection and effective treatment of heavy metal pollution in ...

AI Technical Summary

Problems solved by technology

At present, there are some commercial heavy metal ion detection test papers on the market, some of which are prepared by soaking the organic solution containing the indicator and drying it. The fixation of the indicator is not fully considered, which leads to the easy decolorization of the test paper; The indicator is prepared by mixing with the pulp, the production process is cumbersome, and the detection sensitivity is not ideal

In addition to simple visual colorimetry, there are currently imported spectral colorimeters on the market, but most of these colorimetric devices can only evaluate one indicator, and cannot eliminate the confusion when multiple samples respond to the same indicator at the same time. mutual interference