The interference standard method: evidence of principle, potentialities and limitations

Autor(es)

Amais, Renata S. ^[1] ; Nobrega, Joaquim A. ^[1] ; Donati, George L. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, BR-13560 Sao Carlos, SP - Brazil

^[2] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 29, n. 7, p. 1258-1264, 2014.
• Citações Web of Science: 6

Resumo

The interference standard (IFS) method is a calibration approach recently proposed to overcome polyatomic interference in quadrupole-based inductively coupled mass spectrometry (ICP-QMS). Based on the hypothesis that interfering ions and IFS species such as Ar-36(+), (ArH+)-Ar-36 and Ar-38(+) present similar behaviors in the plasma, the IFS method has successfully been applied in several analytical procedures. In this work, analytes, interfering ions and IFS species are monitored by high-resolution double focused sector field inductively coupled plasma mass spectrometry (HR-SF-ICP-MS) to achieve a better understanding of the mechanism of the IFS method. The relationship between accuracy and signal variations for interfering and IFS species is explored. Critical cases of polyatomic interference in elemental determination using quadrupole-based ICP-MS instruments, such as the ones observed for K-39(+), As-75(+), Si-28(+) and S-32(+), are evaluated. The limitations of the IFS method and the conditions under which it can be most effective are discussed. This is a simple and efficient method that could be extended to other analytical techniques provided that interfering and IFS species present similar signal behaviors. (AU)

• Processo FAPESP: 10/50238-5 - Determinacao de fosforo, enxofre e silicio em biodiesel usando espectrometro de massa acoplado ao plasma induzido com interface de colisao e reacao
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• Processo FAPESP: 12/00920-0 - Avaliação da espectrometria de massas de alta resolução com plasma acoplado indutivamente para a determinação de enxofre em biodiesel e misturas com diesel
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