Liquid trace concentration detection method and device based on nano-gold particle enhancement

Abstract

The invention provides a method for detecting trace concentration of a liquid based on gold nanoparticles. The method comprises the following steps of: irradiating the liquid to be measured in an optical sound pool by using a laser beam, exciting to generate an optical sound signal; acquiring the optical acoustic signal, and processing to obtain an intensity value of the optical acoustic signal; when the concentration of the liquid to be measured changes, the absorption proportion of the laser is also changed, the intensity value of the optical sound signal is finally influenced, and the high-precision measurement of the liquid concentration is realized by utilizing the intensity value of the optical acoustic signal; gold nanoparticles with a surface modification layer are added to the liquid to be tested. The surface modification layer is molecules capable of specifically binding to the substance to be tested of the liquid to be tested. The invention also provides a liquid concentration detection device which can realize the detection method. According to the invention, the ultra-strong absorption characteristic of the gold nanoparticles is utilized, the intensity of the optical acoustic signal is greatly improved, the defect that the detection sensitivity is low in the liquid environment is detected by using the traditional optical sound detection method, and the detection accuracy can reach a trace detection level.

Description

technical field [0001] The invention relates to a liquid detection technology, in particular to a liquid trace concentration detection device and detection method based on nano-gold particle enhancement. Background technique [0002] Concentration is one of the key chemical parameters of liquids. In the industrial production of chemical industry, medicine, food and other industries, the content of certain substances must be strictly limited, and precise detection of substance concentration is required. Especially in the concentration detection occasions of some concentration bases, high-precision liquid concentration detection is particularly important. [0003] Traditional liquid concentration detection methods mainly include hydrometer method, chemical titration method, inductively coupled plasma mass spectrometry, optical rotation method, absorption spectrometry and so on. Among them, the hydrometer method is currently the most widely used liquid concentration detection ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at various disadvantages such as low precision, poor selectivity, and slow speed existing in the existing liquid concentration detection methods, the present invention proposes a device and method with simple structure, convenient operation, and the ability to detect trace-level concentrations of specific substances in liquids

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