Preparation method of Cr<3+> color indicator based on rhodamine B-diethylene triamine derivative

Abstract

The invention relates to a chromium ion detection agent, and specifically relates to a preparation method of a Cr<3+> color indicator based on a rhodamine B-diethylene triamine derivative. According to the invention, a rhodamine B-diethylene triamine derivative is synthesized by using rhodamine B and diethylene triamine. A water-ethanol mixed solution based on the rhodamine B-diethylene triamine derivative can be used as a Cr<3+> color indicator. The high-efficiency color indicator used for rapidly analyzing specific Cr<3+> content in water sample has high anti-interference capacity against other metal ions (Cu<2+>, Zn<2+>, Fe<3+>, Cd<2+>, Pb<2+>, Hg<2+>, Mn<2+>, Fe<2+>, Ba<2+>, and Ag<+>). An applicable pH range is from weakly acidic to neutral. The color indicator is an ideal Cr<3+> color indicator. A response time of the Cr<3+> color indicator upon Cr<3+> is 5min, and a lower detection limit is 5.2*10<-7>mol / L. The color indicator provided by the invention has the advantages such as simple synthesis process, low cost, simple operation, good selectivity, high sensitivity, high response speed, low detection limit, wide application prospect, and the like. The color indicator can be used in complicated sample real-time and rapid detection, and can be used in semi-quantitative detections of micro / trace Cr<3+> in environment samples of different sources.

Description

technical field [0001] The present invention relates to a kind of chromium ion (Cr 3+ ) detection agent, specifically a Cr based on rhodamine B-diethylenetriamine derivatives 3+ Preparation method of color indicator. Background technique [0002] In the process of global industrialization, the content of heavy metal ions in the environment is increasing day by day due to human activities, and the scope of pollution is also expanding day by day. The problem of heavy metal pollution in my country's water is very serious, and the pollution rate of the bottom of rivers, lakes and reservoirs is as high as 80.1% [Zhou Huaidong, Peng Wenqi et al. Water Environment and Water Environment Restoration. Beijing: Chemical Industry Press, 2005]. As early as the investigation in the early 1980s, it was found that many water bodies such as the Jinsha River, Xiangjiang River, Jiyun River, and Jinzhou Bay had heavy metal pollution to varying degrees. The concentration reaches thousands of ...

AI Technical Summary

Problems solved by technology

In August 2011, Qujing, Yunnan notified the outside world of an incident of illegal dumping of highly toxic industrial waste chromium slag, and there are hundreds of thousands of tons of chromium slag piles in the local area, which has caused great harm to the health of livestock and villagers in the local village

[0016] However, most of the currently researched chromogenic heavy metal detectors use the principle of complexing metal ions with organic groups, so most of the detectors are molecules containing organic heterocycles, and their solubility in aqueous solution is not ideal.

In addition, in addition to the sensitive characteristic reactions of a few ions such as mercury ions, the combination effect of most heavy metal ions and detection agents is still not ideal, so the detection sensitivity and scope of application are limited. For these heavy metal ions, it is more suitable and efficient to find The detection reagent is still a difficult problem before us

[0017] At present, there is no information about Cr based on rhodamine B-diethylenetriamine derivatives at home and abroad. 3+ Literature and patent reports on the preparation method of color indicator

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