TITLE:
Imprinted Polymer Inclusion Membrane Based Potentiometric Sensor for Determination and Quantification of Diethyl Chlorophosphate in Natural Waters
AUTHORS:
Varada Vishnuvardhan, Yakkala Kalyan, Krishnapillai Padmajakumari Prathish, Battala Gangadhar, Yadamari Tharakeswar, Talasila Prasada Rao, Gurijala Ramakrishna Naidu
KEYWORDS:
Sensor, Imprinted Polymer Inclusion Membrane, Potentiometry, Diethyl Chlorophosphate, Natural Waters
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.2 No.3,
July
8,
2011
ABSTRACT: Biomimetic potentiometric sensor for the determination of diethyl chlorophosphate was developed using im- printed polymer inclusion membrane strategy. Semi-covalent imprinted and non-imprinted polymer particles were synthesized and found that non-imprinted polymer inclusion membrane was unstable in contrast to im- printed polymer inclusion membrane in determination and quantification of diethyl chlorophosphate. Im- printed polymer inclusion membrane based sensor found to be pH dependant with a 5 min equilibrium response time at pH = 10.5 and linearly responds to diethyl chlorophosphate in the concentration range of 1 × 10–9 to 1 × 10–4 and 1 × 10–4 to 1 × 10–1 mol●L–9 with a detection limit of 1 × 10–9 mol●L–1 (0.17 ppb). It was found that diethyl chlorophosphate response was selective against various selected interferents like pinacolyl methylphosphonate, dimethyl methyl phosphonate, methylphosphonic acid, Phorate and 2, 4-D. The devel- oped sensor was found to be stable for 3 months and can be reusable more than 30 times without loosing sensitivity. The developed sensor was successfully applied for the determination of diethyl chlorophosphate in natural waters.