New PVC nitrate-selective electrode: application to vegetables and mineral waters.
The 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 x 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.
Kong Thoo Lin
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School of Life Sciences, The Robert Gordon University, St. Andrews Street, Aberdeen AB25 1HG, United Kingdom.
Araujo
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Montenegro
M C B S M
MC
Pérez-Olmos
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R
D002712:Chlorides; D017736:Ion-Selective Electrodes; D007476:Ionophores; D009566:Nitrates / Q000032:analysis*; D011145:Polyvinyls; D012680:Sensitivity and Specificity; D014675:Vegetables / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D002712:Chlorides; D007476:Ionophores; D009566:Nitrates; D011145:Polyvinyls; D014867:Water