Cobalt(II)-selective membrane sensor based on a [Me2(13)dieneN4] macrocyclic cobalt complex.
A new poly(vinyl chloride)-based membrane was fabricated with the cobalt(II) complex of 2,4-dimethyl-1,5,8,11-tetraazacyclotrideca-1,4-diene [Me2(13)dieneN4] as an ion carrier. The membrane composition was Co2+ complex/PVC/NaTPB/DBP 15:50:15:20 (w/w). The sensor exhibited a Nernstian response for Co2+ ions over a wide concentration range (7.94x10(-6)-1.0x10(-1) M) at pH 2.5-7.0, a response time of 10 s, and it could be used for 3 months without any significant divergence in potential. The proposed membrane sensor exhibited good selectivity for Co2+ over a wide variety of other metal ions and in mixtures containing up to 25% (v/v) non-aqueous content. The sensor was successfully used as an indicator electrode in the potentiometric titration of Co2+ with EDTA and the direct determination of Co2+ in real samples.
Singh
Ashok Kumar
AK
Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee, 247 667, India. akscyfcy@iitr.ernet.in
Saxena
Puja
P
Mehtab
Sameena
S
Panwar
Amit
A
D015374:Biosensing Techniques / Q000379:methods*; D003035:Cobalt / Q000032:analysis*; D047028:Macrocyclic Compounds; D008567:Membranes, Artificial; D009942:Organometallic Compounds; D017186:Titrimetry
D047028:Macrocyclic Compounds; D008567:Membranes, Artificial; D009942:Organometallic Compounds; D003035:Cobalt