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Lanthanide luminescence based probe for detection of picric acid

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Title Lanthanide luminescence based probe for detection of picric acid
 
Creator Ananthanarayanan, R
Panda, Sitakanta
Sivaramakrishna, M
Panigrahi, B S
 
Subject Picric acid
Aromatic acid ligands
Europium
Ligand sensitization
Luminescence
 
Description 1041-1047
Europium fluorescence is significantly enhanced through ligand sensitization using aromatic benzene mono and di carboxylic acids as ligands in aqueous solution. By optimising metal to ligand ratio and solution pH, it is established that the enhancement is maximum with isophthalic and terephthalic acid. Phosphorescence of isophthalic acid is recorded and its triplet energy level is found to be at 25633 cm-1; just above the fluorescing energy level of Eu3+. On complexation with these ligands though the europium luminescence is enhanced by orders of magnitude, the europium lifetime increased marginally. Addition of picric acid resulted in the quenching of europium luminescence in europium-isophthalic acid complex. Based on this quenching, a fluorimetric method is developed for the estimation of picric acid in aqueous solution. Picric acid in aqueous solution could be estimated down to 0.23 ppm. Common cations and anions found in natural waters did not interfere in the analysis. The precision in measurement is within 5% RSD in the entire range of measurement.
 
Date 2021-08-23T11:04:29Z
2021-08-23T11:04:29Z
2021-08
 
Type Article
 
Identifier 0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/57933
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJC-A Vol.60A(08) [August 2021]