Alternative Approaches Applied to Inductively Coupled Plasma Techniques: Multi-Flow and Two-Flow Calibration

Autor(es)

Machado, Raquel C. ^[1] ; Silva, Ana Beatriz S. ^{[2, 1]} ; Andrade, Daniel F. ^[1] ; Pinheiro, Fernanda C. ^[1] ; Williams, Charles B. ^[3] ; Donati, George L. ^[4] ; Nogueira, Ana Rita A. ^[2] ; Pereira-Filho, Edenir R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, Grp Anal Instrumental Aplicada, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Pecuaria Sudeste, BR-13560970 Sao Carlos, SP - Brazil

^[3] Davidson Coll, Dept Chem, Davidson, NC 28035 - USA

^[4] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 32, n. 4, p. 842-851, APR 2021.
• Citações Web of Science: 0

Resumo

Multi-flow calibration (MFC) is based on monitoring the analytical signal from a single calibration standard solution at several different nebulization gas flow rates (Q), which normalizes plasma conditions and minimizes matrix effects. In the present study, MFC was evaluated, for the first time, applied to inductively coupled plasma optical emission spectrometry (ICP OES) and inductively coupled plasma mass spectrometry (ICP-MS) to analyze different and complex-matrix samples. Al, As, Cd, Cr, Cu, Mn, Pb, and Zn were determined by ICP OES, while As, Cd, Co, Cu, Hg, Mo, Mn, Ni, Se, Sb, Pb, and V were determined by ICP-MS. MFC results were compared with those obtained using external standard calibration (EC) for both techniques and in all cases, MFC showed equal or superior accuracy (recoveries between 80-120%) compared to EC, and lower relative standard deviation (RSDs ≤ 10%). Several tests were also performed using only two nebulization gas flows to build linear models for calibration (called two-flow calibration, TFC) and the accurate results (recoveries ranged from 80 to 110% for ICP OES and from 81 to 102% for ICP-MS) suggests that this strategy can be also applied, resulting in a method with high sample throughput. (AU)

• Processo FAPESP: 18/26145-9 - Biodisponibilidade, bioacessibilidade e especiação de nutrientes e contaminantes inorgânicos em carnes e pescados
• Beneficiário: Ana Rita de Araujo Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/24223-5 - Calibração empregando Laser-Induced Breakdown Spectroscopy (LIBS): alternativas, desafios, comparação das propostas existentes e proposição de um procedimento universal
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/17304-0 - Proposição de métodos para a análise direta de amostras de lixo eletrônico: determinação de elementos preciosos, estratégicos e tóxicos em circuitos eletrônicos e telas touch screen
• Beneficiário: Daniel Fernandes de Andrade
• Modalidade de apoio: Bolsas no Brasil - Doutorado