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A Spectroscopic Study: Quantitative Removal and In Situ Detection of Lead in Aqueous Medium Using Quercetin Pentaphosphate

Lead is a heavy metal pollutant that is present in the environment from various industrial effluents. Application of green chemistry principles has attracted the attention of scientists in recent years as an alternative to conventional methods for environmental remediation and detoxification. Quercetin pentaphosphate (QPP) is a derivativatized form of quercetin with five phosphate groups. QPP is water-soluble hence can be used for sequestration of heavy metal ions in water therefore making them less available in the environment. In this study, QPP was used for the detection and precipitation of Pb2+ions from water samples. Inductively coupled plasma optical emission, Fourier transform infrared, fluorescence, Nuclear Magnetic Resonance and UV-visible spectroscopic analytical techniques were used to carry out the investigations. Complexation of QPP-with Pb2+ ions leads to a reduction in the fluorescence intensity of the pristine QPP molecule in alkaline medium. The overall efficiency of lead removal from water sample was 91% at room temperature conditions. The limit of detection was found to be 0.000346 M. Implications of these results are examined, particularly in relation to prospective applications in environmental remediation.

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