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

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 32, n. 4, p. 842-851, APR 2021.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 18/26145-9 - Bioavailability, bioaccessibility, and speciation of nutrients and inorganic contaminants in meat and fish
• Grantee: Ana Rita de Araujo Nogueira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/24223-5 - Calibration in Laser-Induced Breakdown Spectroscopy (LIBS): alternatives, challenges, proposals comparison and proposition of a universal procedure
• Grantee: Edenir Rodrigues Pereira Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/17304-0 - Proposition of methods for direct analysis of electronic waste samples: determination of precious, strategic and toxic elements in printed circuits boards and LCD screens
• Grantee: Daniel Fernandes de Andrade
• Support Opportunities: Scholarships in Brazil - Doctorate