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[Cu(L)](NO 3 ) 2 (L=4,7‐Bis(3‐aminopropyl)‐1‐thia‐4,7‐diazacyclononane) as a Suitable Ionophore for Construction of Thiocyanate‐Selective Electrodes and Their Use in Determination of Urinary and Salivary Thiocyanate Concentration
Author(s) -
Shamsipur Mojtaba,
Poursaberi Tahereh,
Rezapour Morteza,
Ganjali Mohammad Reza,
Mousavi Mir Fazlollah,
Lippolis Vito,
Montesu Danilea Rita
Publication year - 2004
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200302957
Subject(s) - thiocyanate , ionophore , chemistry , selectivity , inorganic chemistry , electrochemistry , electrode , titration , membrane , ion selective electrode , chloride , ion , nuclear chemistry , organic chemistry , catalysis , biochemistry
The construction, performance characteristics, and application of polymeric membrane (PME) and coated graphite (CGE) thiocyanate‐selective electrodes are reported. The electrodes were prepared by incorporating the complex [Cu(L)](NO 3 ) 2 (L=4,7‐bis(3‐aminopropyl)‐1‐thia‐4,7‐diazacyclononane) into a plasiticized poly(vinyl chloride) membrane. The influence of membrane composition, pH of test solution, and foreign ions were investigated. The electrodes reveal Nernstian behavior over a wide SCN − ion concentration range (1.0×10 −6 –1.0×10 −1 M for PME and 5.0×10 −7 –1.0×10 −2 M for CGE) and show fast dynamic response times of 15 s and lower. The proposed sensors show high selectivity towards thiocyanate over several common organic and inorganic anions. They were successfully applied to the direct determination of thiocyanate in urine and saliva of smokers and nonsmokers, and as an indicator electrode in titration of Ag + ions with thiocyanate.