Potentiometric polymeric membrane electrodes for mercury detection using calixarene ionophores.
It is here established that potentiometric polymeric membrane electrodes based on electrically neutral ionophores are a useful analytical tool for the detection of heavy metal ions from environmental and industrial waste water. PVC based membrane containing p-tert-butyl-calix[4]arenethioether derivative as active material along with sodiumtetraphenylborate (NaTPB) as solvent mediator and dibutylphthalate as a plasticizer in the ratio 45:9:460:310 (w/w%) (I:NaTPB:DBP:PVC) exhibits good properties with a Nernstian response of 29.50+/-1.0 mV per decade of activity and a working concentration range of 7.2 x 10(-8)-1.0 x 10(-1) M. The electrode gave more stable potential readings when used around pH 2.5-6.8 and exhibits fast response time of 14 s. The sensors were found to work satisfactorily in partially non-aqueous media up to 40% (v/v) content of acetone, methanol or ethanol and could be used over a period of 7-9 months. Excellent selectivity for Hg(2+) ions is indicated by match potential method and fixed interference method. The sensors could be used successfully in the estimation of mercury in different sample.
Tyagi
Sonika
S
Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia (Central University), New Delhi 110025, India.
Agarwal
Himanshu
H
Ikram
Saiqa
S
D000096:Acetone; D047250:Calixarenes; D004566:Electrodes; D004867:Equipment Design; D000431:Ethanol; D007220:Industrial Waste; D007476:Ionophores; D017744:Medical Waste Disposal / Q000295:instrumentation / Q000379:methods; D008628:Mercury / Q000032:analysis*; D000432:Methanol; D011143:Polyvinyl Chloride; D011199:Potentiometry / Q000295:instrumentation / Q000379:methods; D012997:Solvents; D013775:Tetraphenylborate
D007220:Industrial Waste; D007476:Ionophores; D017744:Medical Waste Disposal; D012997:Solvents; D047250:Calixarenes; D000096:Acetone; D000431:Ethanol; D013775:Tetraphenylborate; D011143:Polyvinyl Chloride; D008628:Mercury; D000432:Methanol