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Titolo:
Determination of Zn, Cd and Pb in vegetable oil by electrothermal vaporization inductively coupled plasma mass spectrometry
Autore:
Huang, SJ; Jiang, SJ;
Indirizzi:
Natl Sun Yat Sen Univ, Dept Chem, Kaohsiung 80424, Taiwan Natl Sun Yat SenUniv Kaohsiung Taiwan 80424 em, Kaohsiung 80424, Taiwan
Titolo Testata:
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
fascicolo: 6, volume: 16, anno: 2001,
pagine: 664 - 668
SICI:
0267-9477(200106)16:6<664:DOZCAP>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATOMIC-ABSORPTION SPECTROMETRY; CHEMICAL MODIFIERS; EMISSION-SPECTROMETRY; BIOLOGICAL SAMPLES; GRAPHITE-FURNACE; TRACE-ELEMENTS; ICP-MS; LEAD; SELENIUM; MERCURY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Jiang, SJ Natl Sun Yat Sen Univ, Dept Chem, Kaohsiung 80424, Taiwan Natl Sun Yat Sen Univ Kaohsiung Taiwan 80424 ung 80424, Taiwan
Citazione:
S.J. Huang e S.J. Jiang, "Determination of Zn, Cd and Pb in vegetable oil by electrothermal vaporization inductively coupled plasma mass spectrometry", J ANAL ATOM, 16(6), 2001, pp. 664-668

Abstract

The determination of Zn, Cd and Pb in vegetable oil by electrothermal vaporization in combination with inductively coupled plasma mass spectrometry (ETV-ICP-MS) was investigated. An oil emulsion containing 10% v/v vegetable oil, 2% v/v Triton X-100, 2%, v/v H2O2 and 0.4%, v/v HNO3 was prepared. This solution was then injected into the ETV-ICP-MS system for the determination of Zn, Cd and Pb. A mixed modifier of Pd, HNO3 and H2O2 was used to improve the sensitivities and peak shapes of the elements studied. Since the sensitivities of the elements studied in vegetable oil emulsion and that of aqueous solution were quite different, the standard addition method and isotope dilution method were used for the determination of Zn, Cd and Pb in selected vegetable oil samples. The influences of instrument operating conditions, modifier selection, emulsion preparation and interferences on the ion signals were reported. This method has been applied to the determination ofZn. Cd and Pb in sweet corn plumule and canola oil purchased from a local market. The analytical results of various vegetable oil samples determined by the method of standard additions and isotope dilution agreed satisfactorily. Precision between sample replicates was better than 10% with the ETV-ICP-MS method. Under the optimum operating conditions, the detection limit obtained from the standard addition curve was 2.0, 0.1 and 0.2 ng ml(-1) forZn. Cd and Pb, respectively, in prepared emulsified solutions, which corresponded to 20, 1 and 2 ng ml(-1) for Zn, Cd and Pb, respectively, in the original oil samples.

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Documento generato il 06/04/20 alle ore 08:33:55