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32. Supplemental Material - Near infrared spectroscopy for the identification of live anurans: Towards rapid and automated identification of species in the field

Author

Torralvo, Kelly, Durgante, Flávia, Pasquini, Celio, and Magnusson, William E

Subjects
FOS: Materials engineering, 91299 Materials Engineering not elsewhere classified
Abstract

Supplemental Material for Near infrared spectroscopy for the identification of live anurans: Towards rapid and automated identification of species in the field by Kelly Torralvo, Flávia Durgante, Celio Pasquini and William E Magnusson in Journal of Near Infrared Spectroscopy

Published
2023
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43. Instrumentação e metodologia para analise em fluxo continuo, desenvolvimento de um entalpimetro de fluxo, de um sistema monosegmentado e construção de um circuito retentor de picos

Author

Pasquini, Celio, 1957, Oliveira, Walace Alves de, 1940, Universidade Estadual de Campinas. Instituto de Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS

Subjects
Medidores de fluxo
Abstract

Orientador :Walace Alves de Oliveira Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica Doutorado

Published
2021

44. Gran method for end point anticipation in monosegmented flow titration

Author

Aquino Emerson V, Pasquini Celio, Rohwedder Jarbas J. R, Raimundo Jr Ivo M, Montenegro M. Conceição B. S. M, and Araújo Alberto N

Subjects
monosegmented flow analysis, Gran method, chloride titration, Chemistry, QD1-999
Abstract

An automatic potentiometric monosegmented flow titration procedure based on Gran linearisation approach has been developed. The controlling program can estimate the end point of the titration after the addition of three or four aliquots of titrant. Alternatively, the end point can be determined by the second derivative procedure. In this case, additional volumes of titrant are added until the vicinity of the end point and three points before and after the stoichiometric point are used for end point calculation. The performance of the system was assessed by the determination of chloride in isotonic beverages and parenteral solutions. The system employs a tubular Ag2S/AgCl indicator electrode. A typical titration, performed according to the IUPAC definition, requires only 60 mL of sample and about the same volume of titrant (AgNO3) solution. A complete titration can be carried out in 1 - 5 min. The accuracy and precision (relative standard deviation of ten replicates) are 2% and 1% for the Gran and 1% and 0.5% for the Gran/derivative end point determination procedures, respectively. The proposed system reduces the time to perform a titration, ensuring low sample and reagent consumption, and full automatic sampling and titrant addition in a calibration-free titration protocol.

Published
2004

46. Near Infrared Spectroscopy: fundamentals, practical aspects and analytical applications

Author

Pasquini Celio

Subjects
near-infrared spectroscopy, chemometrics, instrumentation, analytical applications, Chemistry, QD1-999
Abstract

This paper intends to review the basic theory of Near Infrared (NIR) Spectroscopy and its applications in the field of Analytical Science. It is addressed to the reader who does not have a profound knowledge of vibrational spectroscopy but wants to be introduced to the analytical potentialities of this fascinating technique and, at same time, be conscious of its limitations. Essential theory background, an outline of modern instrument design, practical aspects, and applications in a number of different fields are presented. This work does not intend to supply an intensive bibliography but refers to the most recent, significant and representative material found in the technical literature. Because this paper has been produced as consequence of the First Workshop on Near Infrared Spectroscopy, whose venue was Campinas - Brazil, as a pre-conference activity of the XI National Meeting on Analytical Chemistry (ENQA), it also depicts the state of the art of NIR spectroscopy in Brazil, pointing out the current achievements and the need to take the technology to a level consistent with this country's economical activities.

Published
2003

48. Determination of Gaseous Analytes in Flow Systems: A Review

Author

Pasquini Celio and Silva Maria do Carmo Hespanhol da

Subjects
gaseous analytes, flow analysis, gas analysis, Chemistry, QD1-999
Abstract

Efforts to develop flow systems for the determination of gaseous analytes in gaseous samples are critically reviewed. Although flow systems present a suitable alternative to management and processing of gaseous samples, relatively few papers dealing with this subject are found in the literature. The increased demand for determination of gaseous analytes, the advent of automated systems based on microcomputers and new devices, such as miniature solenoid valves, which facilitate manipulation of gaseous samples, and the easy access to gaseous standards has, along, driven some recent progress towards the use of flow systems. Flow systems constitute a versatile option capable to be applied to a wide concentration range, rapid, easy to operate with relatively low sample volume, becoming a low cost approach for determination of gaseous analytes.

Published
1999

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