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Dutta M.,Burdwan Harisava Hindu Girls High School Morning | Das D.,University of Burdwan
Desalination and Water Treatment | Year: 2013

Chemical speciation and separation of inorganic chromium species in environmental samples were performed using a newly synthesised chelating ligand, N,N-(Bis-acetato) l-methionine. The ligand can bind very efficiently with Cr(III) and Cr(VI) at two different pH. The ligand loaded on alumina can be reused several times without any significant loss of the ligating group. The maximum adsorption capacity for Cr(III) at any pH above 4.0 is 0.5663 mmol g-1 and for Cr(VI) at pH 2.0 is 1.23 mmol g-1. About 3.0 mol L-1 HCl can completely desorb both chromium species from the polymeric matrix. The detection limit (three times the standard deviation of the blank, as obtained from flame atomic absorption spectroscopic (FAAS) method) for Cr(III) and Cr(VI) were found to be 45 and 46 ng mL-1, respectively. The sorption of both Cr(III) and Cr(VI) was found to follow a second-order rate law. The developed method is used for the chemical speciation and removal of chromium species from different environmental samples and validated by comparing with some standard samples as well as by comparing with results using previously developed method. The concentration of chromium was monitored using FAAS. © 2013 © 2013 Balaban Desalination Publications.


Dutta M.,Burdwan Harisava Hindu Girls High School Morning | Das D.,University of Burdwan
TrAC - Trends in Analytical Chemistry | Year: 2012

The literature on the use of fluorescent sensors for the trace-level determination of toxic cations is highly significant. Among different analytical methods, fluorescence is the most attractive due to its robustness, high sensitivity, selectivity, rapidity, ease of measurement and non-destructive methodology. Here, we illustrate different fluorescent probes developed for detection and estimation of toxic cations, including their molecular structure, sensing mechanism, analytical figures of merit and their applications. We provide a critical survey of the fluorescent sensors of each toxic element (i.e. Hg, Ag, Cd, Cr, Pb, Tl, Co and Ni). A separate section contains the sensors that can detect several toxic elements simultaneously, so-called multi-element sensors. We briefly describe the merits and the demerits of the methods. Finally, we outline future prospects in this field. © 2011 Elsevier Ltd.


Dutta M.,Burdwan Harisava Hindu Girls High School Morning | Das D.,University of Burdwan
Journal of the Indian Chemical Society | Year: 2013

Trace level determination of amino acids is an important and highly relevant area of biochemistry and molecular biology. Herein, we have illustrated different fluorescent probes that have been developed so far for trace level determination of different amino acids. The fluorescence method is highly sensitive, selective, rapid, user friendly and non-destructive. Definitely it is a greener and superior technique compared to other analytical methods. A critical survey of the fluorescent sensors of each type of amino acids, viz. acidic, basic and neutral has been made. A separate section discusses about the sensors which can detect multiple amino acids simultaneously. Novelty and demerits of the methods have been described briefly. Finally, a future prospect in this field has been sketched.


Guha S.,University of Burdwan | Dutta M.,Burdwan Harisava Hindu Girls High School Morning | Das D.,University of Burdwan
Journal of the Indian Chemical Society | Year: 2012

The literature on the use of coumarin derivatives is very rich and highly significant. They have been widely used as fluorescent probes developed for detection and estimation of various cations, anions, amines and amino acids, biothiols, pH, chemical warfare agents, proteins, hydrogen peroxide, hydroxyl radicals and many more. Various pharmacological activities of coumarin derivatives have made them suitable for use as anti-oxidant and anti-inflammatory drugs. They have also exhibited anti-microbial, anti-hepatitis, anti-cancerous, anti-pyretic and analgesic activities.

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