A Novel Quinoline Derivative for Selective and Sensitive Visual Detection of PPB Level Cu2+ in an Aqueous Solution
Current Analytical Chemistry, 2022•ingentaconnect.com
Aim: Selective and sensitive visual detection of Cu2+ in aqueous solution at PPB level using
an easily synthesized compound. Background: The search for a chemosensor that can
detect Cu2+ is very long owing to the fact that an optimum level of Cu2+ is required for
human health and the recommended amount of Cu2+ in drinking water is set to be 1-2 mgL-
1. Thus, it is very important to detect Cu2+ even at a very low concentration to assess the
associated health risks. Objective: We are still seeking the easiest, cheapest, fastest and …
an easily synthesized compound. Background: The search for a chemosensor that can
detect Cu2+ is very long owing to the fact that an optimum level of Cu2+ is required for
human health and the recommended amount of Cu2+ in drinking water is set to be 1-2 mgL-
1. Thus, it is very important to detect Cu2+ even at a very low concentration to assess the
associated health risks. Objective: We are still seeking the easiest, cheapest, fastest and …
Aim
Selective and sensitive visual detection of Cu2+in aqueous solution at PPB level using an easily synthesized compound.
Background
The search for a chemosensor that can detect Cu2+ is very long owing to the fact that an optimum level of Cu2+ is required for human health and the recommended amount of Cu2+ in drinking water is set to be 1-2 mgL-1. Thus, it is very important to detect Cu2+ even at a very low concentration to assess the associated health risks.
Objective
We are still seeking the easiest, cheapest, fastest and greenest sensor that can selectively, sensitively and accurately detect Cu2+ with the lowest detection limit. Our objective of this work was to find one such Cu2+ sensor.
Methods
We have synthesized a quinoline derivative following very easy synthetic procedures and characterized the compound by standard methods. For the sensing study, we used steady state absorption and emission spectroscopy.
Results
Our sensor can detect Cu2+ selectively and sensitively in an aqueous solution instantaneously, even in the presence of an excess amount of other salts. The pale-yellow color of the sensor turns red on the addition of Cu2+. There is no interference from other cations and anions. A 2:1 binding mechanism of the ligand with Cu2+ is proposed using Jobs plot with binding constant in the order of 109 M-2. We calculated the LOD to be 18 ppb, which is quite low than what is permissible in drinking water.
Conclusion
We developed a new quinoline based chemosensor following a straightforward synthetic procedure from very cheap starting materials that can detect Cu2+ visually and instantaneously in an aqueous solution with ppb level sensitivity and zero interference from other ions.
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