Abstract
The ligand 2,6-bis(E)-4-methylbenzylidine)-cyclohexan-1-one sensor has been synthesized as a fluorescence-on sensor/probe for the trace level detection of chromium III ion. The synthesized ligand was characterized by FTIR, 1H-NMR spectroscopy, and fluorimetery. The sensor exhibited an ultra-selective response to chromium among the tested heavy metal ions. Different parameters were optimized like pH, effect of concentration of sensor C, metal ion and contact time. The binding stoichiometry of C:Cr3+ was calculated to be 2:1 (Job's plot) with a significantly low detection limit of 2.3 × 10- 9M. Sensor C were practically employed for detection of chromium in spiked water samples.
Highlights
Chromium is considered one of the major toxicant due to its high solubility and mobility in water
Several analytical methods such as absorption spectrometry [5], plasma mass spectroscopy [6], chemical reduction [7], adsorption [8], electrocoagulation [9], chemical precipitation [10], flotation [11], ion exchange [12], electrochemical [13] and amperometric analysis [14] have been applied for detection of chromium ions, but due to their time-consuming nature, complex operation, expensive instrumentations, sludge production, requirement of large amount of chemicals, and consequent risk of secondary pollutants, these techniques are not preferred for the trace detection of chromium
Ultraviolet-Visible spectrum of sensor C was taken in the presence and absence of different concentration of chromium ions
Summary
Chromium is considered one of the major toxicant due to its high solubility and mobility in water. In environment chromium readily gets dissolved in water and is persistent for longer period of time within the bodies of organisms [3, 4], causing a number of disorders in organisms like tumors, gastrointestinal infections, ulceration, dermal irritation, lung cancer and anemia Several analytical methods such as absorption spectrometry [5], plasma mass spectroscopy [6], chemical reduction [7], adsorption [8], electrocoagulation [9], chemical precipitation [10], flotation [11], ion exchange [12], electrochemical [13] and amperometric analysis [14] have been applied for detection of chromium ions, but due to their time-consuming nature, complex operation, expensive instrumentations, sludge production, requirement of large amount of chemicals, and consequent risk of secondary pollutants, these techniques are not preferred for the trace detection of chromium. In the last few years, the development of optical sensors capable of sensing heavy metal ions is greatly demanded
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