The potentiometric behavior of polymer-supported metallophthalocyanines used as anion-selective electrodes.
Liquid polymer membrane electrodes based on nickel and manganese phthalocyanines were examined for use as anion-selective electrodes. The electrodes were prepared by incorporating the ionophores into plasticized poly(vinyl chloride) membranes, which were directly coated onto the surfaces of graphite electrodes. The resulting electrodes demonstrate near-Nernstian responses over a wide linear range of perchlorate anion (5 x 10(-7) to 1 x 10(-1) M). The electrodes have a fast response time, submicromolar detection limits (5 x 10(-7) M perchlorate), and could be used over a wide pH range of 3.5-10. The influences of lipophilic cationic and anionic additives on the response properties of the electrodes were investigated. The proposed sensors revealed high selectivity for perchlorate over a number of common inorganic and organic anions. The highest selectivity was observed for the electrode based on manganese phthalocyanine in the presence of the lipophilic anionic additive sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate. Application of the electrodes to determine perchlorate in tap water and human urine is also reported.
Arvand
M
M
Department of Chemistry, Faculty of Science, Guilan University, P.O. Box 1914, Rasht, 41355, Iran. arvand@guilan.ac.ir
Pourhabib
A
A
Shemshadi
R
R
Giahi
M
M
D000838:Anions; D001881:Borates / Q000737:chemistry; D004566:Electrodes; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007211:Indoles / Q000737:chemistry*; D007476:Ionophores; D054833:Isoindoles; D008345:Manganese / Q000737:chemistry*; D008567:Membranes, Artificial; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011199:Potentiometry / Q000295:instrumentation / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016482:Urinalysis; D014867:Water / Q000032:analysis*
D000838:Anions; D001881:Borates; D007211:Indoles; D007476:Ionophores; D054833:Isoindoles; D008567:Membranes, Artificial; D009942:Organometallic Compounds; D010472:Perchlorates; D014867:Water; D008345:Manganese; D009532:Nickel; D011143:Polyvinyl Chloride; C013647:phthalocyanine; C494474:perchlorate