title: Derivative potentiometric stripping analysis (dPSA) used for the determination of cadmium, copper, lead, and zinc in Sicilian olive oils.
abstract: Derivative potentiometric stripping analysis (dPSA) was utilized to evaluate the Cd(II), Cu(II), Pb(II), and Zn(II) content in olive oil samples produced in Sicily in the crop year 2000-2001. The repeatability of the method was attested at 86.36% for cadmium, at 94.94% for copper, at 99.00% for lead, and at 98.92% for zinc. Recovery tests were carried out, both on cleanup procedures and on extraction steps, on olive oil spiked at different levels; obtained recoveries were 84.52 +/- 9.86 for cadmium, 97.34 +/- 2.72 for copper, 100.68 +/- 0.67 for lead and 83.35 +/- 1.72 for zinc. Theoretic detection limits were 1.2 ng g(-1) for Cd, 3.6 ng g(-1) for Cu, 5.9 ng g(-1) for Pb, and 14.3 ng g(-1) for Zn. Found concentrations range were 15.94-58.51 ng g(-1) for Cu, 32.64-156.48 ng g(-1) for Pb, and 157.00-385.22 ng g(-1) for Zn. Copper, lead, and zinc were found in all samples. The main advantage of this determination consists of a not too aggressive metals extraction procedure using hydrochloric acid, which avoids losses of elements typical of sample calcinations methods.
authors: Dipartimento di Chimica Organica e Biologica, University of Messina, Salita Sperone 31, 98166 Messina, Italy.
authors: Lara
authors: L
authors: La Pera
authors: Simona
authors: S
authors: Lo Curto
authors: Alessandro
authors: A
authors: Visco
authors: Loredana
authors: L
authors: La Torre
authors: Giacomo
authors: G
authors: Dugo
mesh_terms: D002104:Cadmium / Q000032:analysis*; D003300:Copper / Q000032:analysis*; D004573:Electrolytes; D005506:Food Contamination; D007854:Lead / Q000032:analysis*; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry*; D011199:Potentiometry; D012802:Sicily; D015032:Zinc / Q000032:analysis*
chemical_list: D004573:Electrolytes; D000069463:Olive Oil; D010938:Plant Oils; D002104:Cadmium; D007854:Lead; D003300:Copper; D015032:Zinc