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Tripodal Cadmium Complex and Macrocyclic Ligand Based Sensors for Phosphate Ion Determination in Environmental Samples
Author(s) -
Kumar Ashok,
Mehtab Sameena,
Singh Udai P.,
Aggarwal Vaibhave,
Singh Jitendra
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704147
Subject(s) - chemistry , phosphate , selectivity , ligand (biochemistry) , tributyl phosphate , ether , nuclear chemistry , polyvinyl chloride , bromide , cadmium , membrane , chloride , solvent , inorganic chemistry , extraction (chemistry) , organic chemistry , receptor , biochemistry , catalysis
Tripodal cadmium complex of hydrotris(3‐phenyl‐5‐methylpyrazolyl)borate (I 1 ) and macrocyclic ligand 5,7 : 12,14 : 19,21 : 26,28‐Bzo 4 ‐[28]‐5,13,19,27‐tetraene‐8,11,22,25‐ N 4– 1,4,15,18‐ O 4 (I 2 ), have been synthesized and characterized by IR, 1 H NMR, Mass and elemental analysis. Spectroscopic investigations indicate high affinity of these receptors for dihydrogen phosphate ion. Polyvinyl chloride (PVC) based membranes of (I 1 ) and (I 2 ) using hexadecyl trimethylammonium bromide (HTAB) as cation discriminator and dibutylpthalate (DBP), tributyl phosphate (TBP), dioctylsebacate (DOS), and o‐ nitrophenyloctyl ether ( o ‐NPOE), as plasticizing solvent mediators were prepared and investigated as H 2 PO $\rm{ {_{4}^{-}}}$ selective sensors. The best performance was shown by the membrane of composition (w/w) (I 2 ) (5%):PVC (31%) : DBP (61.5%):HTAB (2.5%). This sensor works well over a wide concentration range 2.1×10 −7 to 1.0×10 −2 M with Nernstian compliance (59.0 mV decade −1 of activity) with a fast response time of 14 s and showed good selectivity for dihydrogen phosphate ion over a number of anions. The sensor exhibits good reproducibility ( SD ±0.3 mV) and could be used successfully for the determination of phosphate in soil water samples.