Interference standard applied to sulfur determination in biodiesel microemulsions by ICP-QMS

Autor(es)

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

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 23, n. 5, p. 797-803, MAY 2012.
• Citações Web of Science: 14

Resumo

Determining sulfur by inductively coupled plasma mass spectrometry (ICP-MS) is not a trivial task especially due to the intense spectral interferences caused by polyatomic ions such as 16O2+, (16OH)2+, 14N16OH2+ and 14N18O+. In this work, argon species naturally present in the plasma (interference standards, IFS) are used to minimize spectral interferences on sulfur determination in biodiesel microemulsions. An external calibration method using ratios between analytical and IFS signals is employed in all determinations. The limits of detection (LOD) calculated for the 32/36, 34/36, 34/37 and 34/38 signal ratios were 4.0, 1.0, 1.0 and 0.8 mg L-1, respectively. A standard reference material (Lubricating Oil, SRM 1848) and spiking studies in biodiesel samples were employed to check the method accuracy. Recoveries varied from 77 to 105% while using any of the IFS probes (36Ar+, 36ArH+ or 38Ar+). (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
• Beneficiário: George Luis Donati
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 06/59083-9 - Espectrometria de massa acoplada ao plasma induzido: aspectos fundamentais e aplicações
• Beneficiário: Joaquim de Araújo Nóbrega
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/17387-7 - Avaliação de técnicas espectroanalíticas e procedimentos de preparo de amostras para a determinação de enxofre em biodiesel e misturas com diesel
• Beneficiário: Renata Stábile Amais
• Modalidade de apoio: Bolsas no Brasil - Doutorado