Fully automated photometric titration procedure employing a multicommuted flow analysis setup for acidity determination in fruit juice, vinegar, and wine

Autor(es)

Lima, Manoel J. A. ^[1] ; Reis, Boaventura F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Energia Nucl Agr, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 135, p. 207-212, NOV 2017.
• Citações Web of Science: 6

Resumo

This work deals with a fully automated multicommuted flow analysis setup employing a homemade syringe pump for fluid propulsion and solenoid valves for solution handling, assembled to carry out photometric titrations using a homemade LED-based photometer. The data acquisition and control software was designed to perform titrations following the binary search concept, in which the course of titration is decided based on previous measurements. The operation conditions were optimized and the setup efficiency was then evaluated by analyzing samples of fruit juice, vinegar, and wine. Furthermore, in order to assess the accuracy, the samples were also analyzed using an independent method. Upon applying the paired t-test to the results, no significant differences at the 95% confidence level were observed. Other useful features are also reported, such as intraday precision of 1.2%, relative standard deviation of 0.9% for an acetic acid solution with a concentration of 0.106 mol L-1, and a titration range of 0.036 to 0.176 mol L-1. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• 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