title: A highly selective lead-sensitive electrode with solid contact based on ionic liquid.
abstract: A new polyvinylchloride membrane sensor for Pb(2+) with solid contact based on ionic liquid has been prepared. The electrode shows a Nernstian response for lead ions over a wide concentration range (1×10(-8) to 1×10(-1) mol L(-1)) and the slope of 29.8 mV/decade. The limit of detection is 4.3×10(-9) mol L(-1). It has a fast response time of 5-7 s and can be used for 4 months without any divergence in potential. The proposed sensor is not pH sensitive in the range 3.5-7.3 and shows a very good discriminating ability towards Pb(2+) ion in comparison with some alkali, alkaline earth, transition and heavy metal ions. It was successfully applied as an indicator electrode in potentiometric titration of lead ions with K(2)CrO(4) and for direct determination of Pb(2+) ions in real sample solution.
authors.affiliation: Department of Analytical Chemistry and Instrumental Analysis, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland. cecylia.wardak@poczta.umcs.lublin.pl
authors.forename: Cecylia
authors.initials: C
authors.lastname: Wardak
mesh_terms: D002712:Chlorides / Q000737:chemistry; D002840:Chromates / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D005618:Fresh Water / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007476:Ionophores; D007854:Lead / Q000737:chemistry*; D008567:Membranes, Artificial; D010968:Plasticizers; D011143:Polyvinyl Chloride; D017680:Potassium Compounds / Q000737:chemistry; D011199:Potentiometry; D012834:Silver / Q000737:chemistry; D018030:Silver Compounds / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis; D014881:Water Supply / Q000032:analysis
chemical_list: D002712:Chlorides; D002840:Chromates; D007476:Ionophores; D008567:Membranes, Artificial; D010968:Plasticizers; D017680:Potassium Compounds; D018030:Silver Compounds; D014874:Water Pollutants, Chemical; D007854:Lead; D012834:Silver; C027373:potassium chromate(VI); D011143:Polyvinyl Chloride; C037548:silver chloride