Exploiting Zone Trapping to Avoid Liberation of Air Bubbles in Flow-based Analytical Procedures Requiring Heating

Autor(es)

Vida, Ana C. E. ^[1] ; Zagatto, Elias A. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13401600 Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Analytical Sciences; v. 30, n. 8, p. 833-838, AUG 2014.
• Citações Web of Science: 3

Resumo

In flow-based analytical procedures requiring heating, liberation of air bubbles is avoided by trapping a sample selected portion into a heated hermetic environment. The flow-through cuvette is maintained into a temperature-controlled aluminium block, thus acting as the trapping element and allowing real-time monitoring. The feasibility of the innovation was demonstrated in the spectrophotometric catalytic determination of vanadium in mineral waters. Air bubbles were not released even for temperatures as high as 95 degrees C. The proposed system handles about 25 samples per hour, requires only 3 mg p-anisidine per determination and yields precise results (r.s.d. = 2.1%), in agreement with ICP-MS. Detection limit was evaluated (3.3 a criterion) as 0.1 mu g L-1 V. (AU)

• Processo FAPESP: 11/08011-6 - Novas abordagens para exploração de reações químicas relativamente lentas em sistemas de análises em fluxo. Aplicações a amostras de relevância agronômica e ambiental.
• Beneficiário: Ana Clara Felix Vida
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/23498-9 - Sistemas avançados de análises químicas em fluxo: aplicações nas áreas tecnológica, agronômica e ambiental
• Beneficiário: Elias Ayres Guidetti Zagatto
• Modalidade de apoio: Auxílio à Pesquisa - Temático