title: Combinatorial screening of potentiometric Pb(II) sensors from polysulfoaminoanthraquinone solid ionophore.
abstract: A potentiometric Pb(II)-selective sensor was fabricated by a combinatorial screening of electrically conducting polysulfoaminoanthraquinone (PSA) nanoparticles as a solid ionophore, ion exchangers (oleic acid (OA) and NaTPB), plasticizers in a polyvinyl chloride (PVC) matrix, membrane thickness, inner filling ion species, and concentration. The membrane sensor with the composition of PSA/PVC/DOP (dioctyl phthalate)/OA (1.0:33:61:5.0) exhibited the best performance, including a slope of 29.3 mV decade(-1) in the concentration range 10(-6.3)-10(-1.6) M, detection limit of 1.6 × 10(-7) M, response time of 16 s, lifetime of five months, and good response reversibility. The proposed sensor has demonstrated good selectivity for Pb(II) over other monovalent, divalent and trivalent interfering ions, and could be used in a pH range of 3.62-5.22. The Pb(II) sensor has been successfully applied for the determination of Pb(II) concentration in real-world samples and also as an indicator electrode for potentiometric titration of lead ions.
authors: Institute of Materials Chemistry, Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, College of Materials Science and Engineering, Tongji University , 1239 Si-Ping Road, Shanghai 200092, China.
authors: Mei-Rong
authors: MR
authors: Huang
authors: Yong-Bo
authors: YB
authors: Ding
authors: Xin-Gui
authors: XG
authors: Li
mesh_terms: D000880:Anthraquinones / Q000138:chemical synthesis / Q000737:chemistry*; D020650:Combinatorial Chemistry Techniques; D007476:Ionophores / Q000138:chemical synthesis / Q000737:chemistry*; D007854:Lead / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry; D011199:Potentiometry
chemical_list: D000880:Anthraquinones; D007476:Ionophores; D007854:Lead