Open source, low-cost device for thermometric titration with non-contact temperature measurement.

Autor: Alessio KO; Departamento de Tecnologia e Ciência Dos Alimentos, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil; Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil., Tischer B; Instituto de Ciência e Tecnologia Dos Alimentos, Universidade Federal Do Rio Grande Do Sul, 91501-970, Porto Alegre, RS, Brazil., Voss M; Departamento de Tecnologia e Ciência Dos Alimentos, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil., Teixeira ID; Programa de Pós-Graduação Em Sistemas e Processos Industriais, Universidade de Santa Cruz Do Sul, 96815-900, Santa Cruz Do Sul, RS, Brazil., Brendler BM; Programa de Pós-Graduação Em Sistemas e Processos Industriais, Universidade de Santa Cruz Do Sul, 96815-900, Santa Cruz Do Sul, RS, Brazil., Duarte FA; Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil., Helfer GA; Programa de Pós-Graduação Em Sistemas e Processos Industriais, Universidade de Santa Cruz Do Sul, 96815-900, Santa Cruz Do Sul, RS, Brazil., Costa AB; Programa de Pós-Graduação Em Sistemas e Processos Industriais, Universidade de Santa Cruz Do Sul, 96815-900, Santa Cruz Do Sul, RS, Brazil., Barin JS; Departamento de Tecnologia e Ciência Dos Alimentos, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil. Electronic address: juliano@ufsm.br.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2020 Aug 15; Vol. 216, pp. 120975. Date of Electronic Publication: 2020 Apr 05.
DOI: 10.1016/j.talanta.2020.120975
Abstrakt: This work proposes a simple device for thermometric titration using a contactless sensor. A low-cost infrared sensor (around $5) was adapted in a disposable, polystyrene vessel for monitoring the temperature to determine the endpoint of neutralization, redox, and complexation titrations, using a homemade syringe pump to titration control. Open-source software was developed to control the device using the Raspberry Pi platform and to perform automatic endpoint determination. The influence of sample volume, the flow rate of titrant, and sensor distance from the solution were evaluated to lower the variation among measurements. The parameters chosen in this regard were 10 mL of sample, 0.8 mL min -1 of titrant solution flow rate, and 3 cm of distance from the sensor to the solution. Results for the determination of the acidity of sauces and the ascorbic acid and calcium content of pharmaceutical products were compared with those from official compendia. The performance of the sensor also was compared with an infrared camera. The proposed method agreed with conventional ones to an extent ranging from 93% to 106%. The robust analytical performance and low cost of the system are essential features that could broaden the use of enthalpimetric analysis in several laboratories.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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