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.
Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia (Central University), New Delhi 110025, India.
Sonika
S
Tyagi
Himanshu
H
Agarwal
Saiqa
S
Ikram
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