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New PVC Nitrate-Selective Electrode: Application to Vegetables and Mineral Waters

New PVC Nitrate-Selective Electrode: Application to Vegetables and Mineral Waters

P Kong Thoo Lin, A N Araujo, M C B S M Montenegro, R Pérez-Olmos

J Agric Food Chem. 2005 Jan 26;53(2):211-5.

PMID: 15656651

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP33734520	Tetraoctylammonium nitrate		33734-52-0	Price

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