Method for swiftly detecting Leersia hexandra middlechro (VI) ion concentration

Abstract

The invention discloses a method for detecting Leersia hexandra middlechro (VI) ion concentration by using a CdTe@SiO2 quantum dot-rhodamine B energy converting system. The system regards CdTe@SiO2 quantum dot as a donor, regards the rhodamine B as an acceptor, utilizes chromium (VI) ions and the rhodamine B to form novel composite in a combining mode through static interaction, causes the fluorescence of the rhodamine B extinction, thereby establishing the method for detecting Leersia hexandra middlechro (VI) ions. The extinction degree of the rhodamine B fluorescence and the concentration of the chromium (VI) ions are in a good linear relation in the range of 2.0*10-8-3.0*10-7 mole / liter, the linear relevant coefficient r=0.9992, and method detection limit is 6.2*10-9 mole / liter. The method for swiftly detecting the Leersia hexandra middlechro (VI) ion concentration overcomes the defects of being poor in selectivity, low in sensitivity, rigorous in reaction condition and bad in stability and the like while detecting in the prior art, effectively improves selectivity and sensitivity, and so that the detection for the Leersia hexandra middlechro (VI) ions are more convenient and swift.

Description

technical field [0001] The present invention relates to a kind of utilization CdTeSiO 2 Quantum dot-rhodamine B energy transfer system for rapid detection of chromium (Ⅵ) ion concentration in Lishihe. Background technique [0002] Chromium ion (Ⅵ) is a toxic, irritating and non-degradable carcinogen; with the development of industry, chromium is widely used in electroplating, tanning, mining and other industries. According to data, the annual emission of The chromium in the atmosphere, water and soil is as high as 500,000 tons. my country is one of the countries with serious chromium pollution; among them, hexavalent chromium will endanger human health through the atmosphere, water and biological chain, so the solution to the pollution of heavy metal cadmium and The problem of prevention and control is imminent; phytoremediation of chromium pollution is a green technology with great potential. The newly discovered "Lishihe" with my country's independent intellectual property ...

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Problems solved by technology

[0003] At present, spectrophotometry and atomic absorption spectrophotometry are mainly used to investigate the content of chromium ions adsorbed by Li Shihe at home and abroad. The former has harsh reaction conditions, poor detection, low sensitivity, and long operation time; the latter requires expensive instruments and complicated early stages. Therefore, it is of great significance to seek a method for detecting chromium ions (Ⅵ) with high sensitivity and high selectivity; and the application of fluorescent quantum dots wrapped by core-shell as the donor of the energy transfer system, compared with the traditional fluorescent The dye material is more environmentally friendly, and the acceptor of energy transfer (rhodamine B) has higher fluorescence intensity, so as to establish a fast, sensitive and accurate method for detecting chromium ion (Ⅵ); currently, CdTeSiO is used at home and abroad 2 Quantum dots-rhodamine B energy transfer system has not been reported yet for the detection of chromium(Ⅵ) ions in Lishihe

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