A method for the determination of cadmium (II) and zinc (II) in olive oils by derivative potentiometric stripping analysis after dry ashing of the sample is described. The metal ions were concentrated as their amalgams on a glassy carbon working electrode that was previously coated with a thin mercury film and then stripped by a suitable oxidant. Potential and time data were digitally converted into dt dE−1, and E was plotted vs. dt dE−1, thus increasing sensitivity of the method and improving resolution of the analysis. Quantitative analysis was carried out by the method of standard additions; a good linearity was obtained in the range of concentrations examined. Recoveries of 92–102% for cadmium (II) and of 89–99% for zinc (II) were obtained from an olive oil spiked at different levels. The detection limits were 5.1 ng g−1 for cadmium (II) and 7.6 ng g−1 for zinc (II).

Determination of cadmium (II) and zinc (II) in olive oils by derivative potentiometric stripping analysis

LO COCO, Filippo;CECCON, Luciano;NOVELLI, Veronica
2003

Abstract

A method for the determination of cadmium (II) and zinc (II) in olive oils by derivative potentiometric stripping analysis after dry ashing of the sample is described. The metal ions were concentrated as their amalgams on a glassy carbon working electrode that was previously coated with a thin mercury film and then stripped by a suitable oxidant. Potential and time data were digitally converted into dt dE−1, and E was plotted vs. dt dE−1, thus increasing sensitivity of the method and improving resolution of the analysis. Quantitative analysis was carried out by the method of standard additions; a good linearity was obtained in the range of concentrations examined. Recoveries of 92–102% for cadmium (II) and of 89–99% for zinc (II) were obtained from an olive oil spiked at different levels. The detection limits were 5.1 ng g−1 for cadmium (II) and 7.6 ng g−1 for zinc (II).
File in questo prodotto:
File Dimensione Formato  
Food Control 2003-1.pdf

accesso aperto

Tipologia: Documento in Post-print
Licenza: Non pubblico
Dimensione 80.09 kB
Formato Adobe PDF
80.09 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/720480
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 58
  • ???jsp.display-item.citation.isi??? ND
social impact