Potentiometric perchlorate determination at nanomolar concentrations in vegetables

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Leoterio, DMS (Author) Other; Paim, APS (Author) Other; Belian, MF (Author) Other; Galembeck, A (Author) Other; Lavorante, AF (Author) Other; Pinto, E (Author) Other; Amorim, CG (Author) FFUP; Araujo, AN (Author) FFUP; Montenegro, MCBSM (Author) FFUP

Journal

Title: Food Chemistry

Vol. 227

Pages: 166-172

ISSN: 0308-8146

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 5 Citations

Other information

Authenticus ID: P-00M-E6R

DOI: 10.1016/j.foodchem.2017.01.088

Abstract (EN): 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 12 mmol/kg of the polyamine bisnaphthalimidopropyl-4,4'-diaminodiphenylmethane and 2-nitrophenyl phenyl ether 68% (w/w) as plasticizer tasted on a conductive epoxy resin. Under optimal flow conditions, the sensor responded linearly in the concentration range of 6.3 x 10-7-1.0 x 10-3 mol/L perchlorate. In order to extend the determinations to lower concentrations (4.6( 1.3) x 10-10 mol/L perchlorate), a column packed with 70 mg 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7