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New highly selective picrate sensors based on charge-transfer complexes
Faculty
Science
Year:
2004
Type of Publication:
Article
Pages:
285-290
Authors:
Elmosallamy, MAF
DOI:
10.2116/analsci.20.285
Journal:
ANALYTICAL SCIENCES JAPAN SOC ANALYTICAL CHEMISTRY
Volume:
20
Research Area:
Chemistry
ISSN
ISI:000220500200007
Keywords :
, highly selective picrate sensors based , charge-transfer
Abstract:
Two novel highly selective potentiometric membrane sensors responsive to picrate ion were developed. They are based on the use of N,N'-dibenzoyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane (DD18C6)-picrate and Kryptofix 222-picrate charge-transfer complexes as novel electroactive materials in poly(vinyl chloride) matrix membranes plasticized with o-nitrophenyloctylether or dioctylphthalate. The sensors show a Nernstian response with anionic slopes of -59.0 +/- 0.1 and -58.0 +/- 0.2 mV decade(-1) over concentration ranges of 6.0 x 10(-5) - 1.0 x 10(-2) and 7.0 x 10(-5) - 1.0 x 10(-2) mol l(-1) picrate ion and pH ranges of 5 - 11.5 and 5.5 - 11.5 for DD18C6 and Kryptofix 222 based picrate sensors, respectively. Both sensors show highly selectivity towards picrate ion over many hydrophilic and lipophilic anions, and exhibit a non-Hofmeister selectivity sequence, which is an improvement over methods reported so far. The sensors are used for the titrimetric determination of alkaloids using picrate as a titrant.
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