ISSN:
1040-0397
Keywords:
Ion-selective electrode
;
ESR investigation
;
pH titration
;
Copper ion
;
Humic substances
;
HS-Cu complexes
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A carbon rod electrode coated with a poly(vinyl chloride) (PVC) membrane containing aquatic humic substances (HS) isolated from swamp water was constructed for the detection of copper(II) ion. The electrode exhibits a linear response with a slope of 60.1 ± 2.0 mV/decade in concentration range from 10-5 mol L-1 to 10-2 mol L-1. The detection limit for the copper(II) ion was estimated to be of 1 × 10-5 mol L-1. Electron spin resonance spectroscopy (ESR) and pH titration results indicated that the humic substances interact with copper(II) ions to form complexes. These results confirm that the potential response of the membrane electrode with good sensitivity, selectivity except for Pb2+ and Hg2+, and response to copper(II) ion is due to the formation of stable complexes occurring at the electrode surface.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140091612
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