Method for detecting chromium ions by fusing liquid-liquid microextraction and SERS technology

Abstract

The invention belongs to the technical field of food safety and material chemistry, and relates to a method for detecting chromium ions by fusing liquid-liquid micro-extraction and an SERS technology.The method comprises the steps that a silver nano-flower base is prepared and dissolved in ethanol to acquire a silver nano-flower base ethanol solution; hexavalent chromium ion solutions of different concentrations are prepared, and hydrochloric acid, a rhodamine 6G solution and deionized water are added; the mixture of methanol and chloroform is added; after shaking, ultrasonic and centrifugation, a substrate solution is collected and mixed with the silver nano-flower base ethanol solution; spectra are collected, and a standard curve for the spectral intensity corresponding to different concentrations of hexavalent chromium ions is drawn; a sample to be tested is selected; and after the spectra are collected, the concentration of trivalent or hexavalent chromium ions of the sample to be tested is detected according to the established standard curve. According to the invention, the method can be applied to detect trivalent and hexavalent chromium ions; the extracted solution is applied to surface enhanced Raman detection, and the result is accurate, reliable and highly sensitive; and the method is suitable for technical fields such as food safety and environmental monitoring.

Description

technical field [0001] The invention belongs to the technical fields of food safety and material chemistry, and in particular relates to a method for detecting chromium ions by combining liquid-liquid microextraction and SERS technology. Background technique [0002] Trivalent chromium is a component of glucose tolerance factor, which is essential for the metabolism of blood sugar and is an essential trace element for the human body. However, hexavalent chromium is a highly toxic substance that can cause damage to lung cancer, liver, kidney and stomach, as well as skin irritation and allergies. At present, conventional methods for detecting hexavalent chromium ions mainly include atomic absorption spectrometry, high performance liquid chromatography, inductively coupled plasma mass spectrometry, gas chromatography, fluorescence spectrometry, and atomic emission spectrometry. The processing is complex or the instrument is expensive or the detection sensitivity is low, so it ...

AI Technical Summary

Problems solved by technology

Extraction technology is especially suitable for gathering analytes while removing other impurities due to its ability to concentrate specific analytes. The combination of liquid-liquid microextraction technology and traditional technology has the disadvantages of high detection accuracy and low detection sensitivity.

SERS (Surface-enhanced Raman scattering) technology overcomes the shortcomings of low sensitivity of Raman spectroscopy, and can obtain structural information that is not easily obtained by conventional Raman spectroscopy. It is widely used in surface research, adsorption interface surface state research, etc. The characteristics of fast, accurate, high selectivity, and high sensitivity have been applied to the detection and analysis of toxic and harmful substances, but in Raman analysis, there are still more complicated pretreatment problems. A method for detecting chromium ions with high selectivity and high sensitivity at the same time as SERS spectroscopy is of great significance, but there is no report on the ultrasensitive detection of chromium ions using SERS technology combined with liquid-liquid microextraction

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