Method for specifically detecting silver ions in aqueous solution by utilizing rhodamine compound and application thereof

Abstract

The invention belongs to the field of fluorescent probes for metal ion detection, and particularly relates to an economical method for detecting Ag<+> in a solution. According to the novel method, commercially available analysis-grade rhodamine 6G is used as a double-key single-lock fluorescent probe, and Ag<+> is selectively detected in an aqueous solution under the auxiliary irradiation action of a 395 nm ultraviolet lamp with the light source power of 20 W. Specifically, rhodamine 6G is added into an Ag<+> solution at room temperature, and the fluorescence quenching efficiency of the rhodamine 6G reaches 99% after the rhodamine 6G is irradiated by a 395 nm ultraviolet lamp with the light source power of 20 W for 3 min. Under the same condition, fluorescence quenching of the solution which is not irradiated by ultraviolet light does not occur. The method has the advantages of cheap and easily available raw materials, easy operation of the detection method, no use of an organic solvent in the detection process, high detection efficiency, good selectivity, strong anti-interference ability and good pH adaptability.

Description

technical field [0001] The invention belongs to the field of fluorescent probes for metal ion detection, in particular to a very economical solution for Ag + method of detection. Background technique [0002] With the improvement of medical level, it is found that heavy metal ions are very harmful to the human body. Traditional detection methods such as volumetric analysis, ICP-MS, atomic absorption, etc., are greatly limited due to high detection costs and cumbersome operations, so fluorescence detection methods emerged as the times require. Fe has been detected 3+ 、Cu 2+ 、Cr 3+ , Hg 2+ 、Al 3+ and other chemical sensors were synthesized and applied. Silver (Ag) and silver-containing compounds are widely used in the photographic, electronic, pharmaceutical and imaging industries due to their unique physical and chemical properties. Therefore, with the rapid development of industry and economy, more and more Ag + is emitted into the ecosystem. Although a small amoun...

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Problems solved by technology

[0003] In recent years, there have been a large number of reports on fluorescent probes, and researchers have designed and synthesized many Ag + fluorescent probes, but these fluorescent probes in Ag + There are some common problems in detection: First, the synthesis and preparation of fluorescent probes is complicated, and most of them need to undergo multi-step organic synthesis steps to prepare the required fluorescent probe compounds, which requires a large amount of reagents and solvents, and the price of some reagents Very expensive; second, most fluorescent probes have poor water solubility, and organic solvents need to be added to help them dissolve during the test; third, the detection principle of most fluorescent probes is based on Ag + Coordination with fluorescent probes, so the selectivity and anti-interference ability is poor, and it is easy to be interfered by other metal ions in the solution; Fourth, the pH adaptability of many fluorescent probes is poor, and it is not suitable for Ag + The fluorescence response is easily affected by the pH of the solution, and it cannot be used for Ag when the pH of the solution is too low or too high + Fifth, many fluorescent probes have short fluorescence emission wavelengths, which are easily interfered by background fluorescence in the actual detection process

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