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Potentiometric Perchlorate Determination at Nanomolar Concentrations in Vegetables

Potentiometric Perchlorate Determination at Nanomolar Concentrations in Vegetables

Dilmo M S Leoterio, Ana Paula S Paim, Mônica F Belian, André Galembeck, André F Lavorante, Edgar Pinto, Célia G Amorim, Alberto N Araújo, Maria C B S M Montenegro

Food Chem. 2017 Jul 15;227:166-172.

PMID: 28274418

Abstract:

In this work, an expeditious method based on the multi-commutated flow-analysis concept with potentiometric detection is proposed to perform determinations of the emergent contaminant perchlorate in vegetable matrices down to nanomolar concentration. To accomplish the task, a tubular shaped potentiometric sensor selective to perchlorate ion was constructed with a PVC membrane containing 12mmol/kg of the polyamine bisnaphthalimidopropyl-4,4'-diaminodiphenylmethane and 2-nitrophenyl phenyl ether 68% (w/w) as plasticizer casted on a conductive epoxy resin. Under optimal flow conditions, the sensor responded linearly in the concentration range of 6.3×10-7-1.0×10-3mol/L perchlorate. In order to extend the determinations to lower concentrations (4.6(±1.3)×10-10mol/L perchlorate), a column packed with 70mg of sodium 2,5,8,11,14-pentaoxa-1-silacyclotetradecane-polymer was coupled to the flow-system thus enabling prior pre-concentration of the perchlorate. The proposed procedure provides a simpler alternative for the determination of perchlorate in foods, nowadays only allowed by sophisticated and expensive equipment and laborious methods.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2216128	2-Nitrophenyl phenyl ether		2216-12-8	Price

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