Ultrasonic-assisted Dissolution of Vegetable Oils With Tetrabutylammonium Hydroxide for Multielemental Analysis by Inductively Coupled Plasma Mass Spectrometry

JUAN DANIEL RUIZ-DÍAZ ; MARIANELA SAVIO ; MARIO F. MOYANO ; ERNESTO E. VERNI; LUIS D. MARTINEZ ; RAÚL A. GIL

ATOMIC SPECTROSCOPY

PERKIN-ELMER CORP

Año: 2015 vol. 36 p. 55 - 62

0195-5373

A novel, simple, and rapid method is presented for the determination of B, Cl, Ga, Ge, As, Br, Se, Sn, Sb, I, Te, Pb, and Bi in vegetable oil samples by inductively coupled plasma mass spectrometry (ICP-MS) after sample solubilization with tetrabutylammonium hydroxide (TBAH) in an ultrasonic bath. Sample introduction was accomplished after dilution in water with a high-performance microconcentric nebulizer and a cooled spray chamber. The sample was mixed with TBAH, kept in an ultrasonic bath with heat for half an hour, and then diluted with nitric acid to form an aqueous solution. External calibration against aqueous standard solutions, without TBAH, was used for quantification of a number of elements. However, external calibration with TBAH allowed the determination of all analytes with good accuracy. Comparison of the obtained results with microwave- assisted digestion was performed by linear regression.