Preparation method of Cu (2+) color indicator based on rhodamine B-2-formaldehyde thiophene derivative

Abstract

The invention relates to a copper ion detection agent, and particularly relates to a preparation method of a Cu(2+) color indicator based on rhodamine B-2-formaldehyde thiophene derivative. The method comprises the step of firstly, carrying out condensation reaction on rhodamine B and hydrazine monohydrate to obtain hydrazine rhodamine B, wherein the hydrazine rhodamine B reacts with 2-thiophenecarboxaldehyde to obtain the rhodamine B-2-formaldehyde thiophene derivative; and water-ethanol mixed solution based on the rhodamine B-2-formaldehyde thiophene derivative can be used as the Cu(2+) color indicator. The preparation method can be used for rapidly analyzing an efficient color indicator with special Cu (2+) content in a water sample, is strong in anti-jamming capability on the other metal ions (Zn(2+), Cr(3+), Fe(3+), Cd(2+), Mn(2+), Hg(2+), Fe(2+), Pb(2+), Ba(2+) and Ag(+)), and is the efficient Cu(2+) color indicator; the applicable pH range is from faintly acid to neutral property; the response time of the Cu2(+) color indicator on the Cu2(+) is 3 minutes; and the lowest detection limit is 1.7*10(-7)mol / L. The preparation method has the advantages of being simple in synthetic process, low in cost, simple and convenient to operate, good in selectivity, high in sensitivity, high in response speed, low in detection limit, wide in application prospect and the like, can be used for real-time and rapid measurement of complicated samples, and also can be used for semi-quantitative detection of environmental sample tiny / trace Cu(2+) from different sources.

Description

technical field [0001] The present invention relates to a kind of copper ion (Cu 2+ ) detection agent, specifically related to a Cu 2+ 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 ppm[Ho K C, Hui K C C. Chemical contaminat...

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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

[0013] 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

[0014] At present, there is no information on Cu based on rhodamine B-2-formaldehyde thiophene derivatives 2+ Literature and patent reports on the preparation method of color indicator

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