Multi-energy calibration as a strategy for elemental analysis of fertilizers by microwave-induced plasma optical emission spectrometry

Autor(es)

Machado, Raquel C. ^{[1, 2]} ; Silva, Ana Beatriz S. ^{[1, 2]} ; Donati, George L. ^[3] ; Nogueira, Ana Rita A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Pecuaria Sudeste, POB 339, BR-13560970 Sao Carlos, SP - Brazil

^[3] Wake Forest Univ, Dept Chem, Salem Hall, POB 7486, Winston Salem, NC 27109 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 33, n. 7, p. 1168-1172, JUL 2018.
• Citações Web of Science: 16

Resumo

Multi-energy calibration (MEC) was applied for the determination of As, Ba, Cd, Cr, and Pb in fertilizer samples by microwave-induced plasma optical emission spectrometry. Commercial fertilizer samples and a certified reference material of mineral fertilizer (CRM NIST 695) were digested using microwave-assisted acid. The MEC approach was carried out using only two calibration solutions: S-1, composed of 50% v/v digested sample and 50% v/v standard reference solution containing the analytes, and S-2, composed of 50% v/v sample and 50% v/v blank solution. The accuracy of the method was evaluated by analyzing CRM NIST 695, with recoveries in the 96-101% range. Addition and recovery experiments were also carried out for Cd determination, with recoveries between 92 and 105% for the evaluated samples. The MEC strategy was compared with traditional external standard calibration and standard additions methods and was the only one to provide accurate results for all evaluated analytes. (AU)

• Processo FAPESP: 13/26672-5 - Desenvolvimento de procedimentos para a determinação de As, Ba, Cd, Cr, Pb e Si em amostras de fertilizantes minerais por espectrometria de emissão óptica com plasma induzido por micro-ondas (MIP OES)
• Beneficiário: Raquel Cardoso Machado
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/14488-0 - Desenvolvimento de métodos analíticos para a determinação da qualidade de fertilizantes e resíduos de curtumes
• Beneficiário: Ana Rita de Araujo Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Regular