In:
ECS Transactions, The Electrochemical Society, Vol. 3, No. 10 ( 2006-10-20), p. 97-108
Abstract:
In this work the results obtained on the manufacturing and evaluation of a novel sensor built with a composite material, highly selective to nitrate ions using doped polypyrrole as a recognition agent, are presented. When the ratio recognition agent-graphite was optimized to 1:1 the sensitivities found closely approached nernstian behaviour. The response times were smaller than 20 s. Batch characterization of the sensor displayed a sensitivity of 57.10 mV/decade of nitrate ion activity and a detection limit of 5.37 x 10-5 M, which are comparable to those reported for commercial sensors. The evaluation of the selectivity coefficients showed high affinity to nitrate ions, superior to that of other commercial sensors. The composite material gives the sensor a prolonged service life. Coupling the sensor and a solid state, composite-type, reference electrode to a flow injection analytical system, FIA, permitted to achieve an effective overall assessment of the system.
Type of Medium:
Online Resource
ISSN:
1938-5862
,
1938-6737
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2006
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