jf049227u_si_001.pdf (70.31 kB)
New PVC Nitrate-Selective Electrode: Application to Vegetables and Mineral Waters
journal contribution
posted on 2005-01-26, 00:00 authored by P. Kong Thoo Lin, A. N. Araujo, M. C. B. S. M. Montenegro, R. Pérez-OlmosThe paper refers the analytical potentialities of the oxa-azamacrocycles as potentiometric ionophores
for the construction of electrodes selective to nitrate. Afterward, the membrane selective to nitrate is
designed and optimized using a [3.3.3.3]oxazane as an ionophore. The membrane was prepared
using dibutylphthalate as a solvent mediator, tetraoctylammonium as a lipophilic membrane additive,
and poly(vinyl chloride (PVC) as a polymeric matrix, applied directly onto a conductive graphite/epoxy resin support. The electrodes presented a slope of 60 ± 0.1 mV log-1, a low limit of linear
response of 4.2 × 10-6 mol L-1, a useful lifetime of 1 year, and improved selectivity characteristics
when compared with other nitrate electrodes. The good working characteristics of this electrode,
constructed without inner-reference solution, made possible its application to the determination of
nitrate in different types of vegetables and bottled mineral waters without the use of a conditioning
solution. The application of a significant F test proved that the results obtained were similar to those
attained by application of the brucine spectrophotometric method adopted as a reference technique.
Linear regression analysis also showed good agreement between the results obtained by the proposed
method and the reference one.
Keywords: Oxa-azamacrocycles; ionophore; nitrate-selective electrode; vegetables; water