A new closed-vessel conductively heated digestion system: fostering plant analysis by inductively coupled plasma optical emission spectroscopy

Autor(es)

Miranda, Kelber ^[1] ; Pereira-Filho, Edenir Rodrigues ^[2] ; Gomes Neto, Jose Anchieta ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 29, n. 5, p. 825-831, 2014.
• Citações Web of Science: 4

Resumo

Open-vessel acid digestion is a low cost and easily automated sample decomposition method commonly used in laboratories involved in routine plant analysis. However, large amounts of reagents are required, the decomposition efficiency is limited by the boiling point of the digestion mixture and sample contamination and losses of volatile elements can frequently occur. In addition, the venting of large amounts of acid fume is undesirable due to its impact on the analyst and environment. For this reason, a simple, rugged and low cost closed-vessel conductively heated digestion system was developed and evaluated. The system accommodates 38 reaction vessels and enables the digestion of 200 mg of plant samples for subsequent elemental determination. The digestion procedure was optimized with the help of video images. The accuracy was confirmed by analyzing five certified reference materials digested by the proposed system. The digestion efficiency was evaluated by determining the residual carbon content and residual acidity. When plant samples were digested using the proposed system, results for Al, B, Ca, Cu, Fe, K, Mg, Mn, P, S and Zn by inductively coupled plasma optical emission spectroscopy were in agreement with those obtained after closed-vessel microwave-assisted digestion. (AU)

• Processo FAPESP: 12/13500-9 - Avaliação do bismuto como padrão interno para chumbo em técnicas espectrométricas
• Beneficiário: José Anchieta Gomes Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/02891-7 - Construção e avaliação de um sistema miniaturizado de digestão em frasco fechado para preparar materiais botânicos para análise elementar
• Beneficiário: Kelber dos Anjos de Miranda
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado