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Miniaturized equipment based on change of optical property and management by free hardware for determination of trace gases in the atmosphere


The determination of gases in situ is a challenge for analytical chemistry. This occurs because there is not always power available for running equipment, or because equipments are heavy or large and difficult to handle in the field. One possible solution is the development of miniaturized equipment, both for sampling and determination steps running on battery. Under the analytical aspect, the determination of micro volumes is feasible and has already used in several analysis procedures. However, sampling procedure using microvolume, have not yet explored, although it presents the advantage of requiring lower sampling time. In this project we intend to develop methods for gases seeking to exploit these features. We will build equipment using parts purchased in electronics stores. The management of the sampling procedures and determination will be done with automated controllers using free hardware. In the sampling step, we use physical collectors or chemical reagent solution contained in small volumes. The collected sample should be liable to undergo transformation, resulting in a solution with optical activity (absorbance, reflectance, fluorescence etc.) that can be measured and quantified as a analytical signal. For detection and quantification of the analytical signal, we will build a homemade device using photodetector systems or even digital imaging using LED as the light source. The image sensor will be connected to Arduino microcontroller for acquisition of the analytical signal. For the development of mechanical and computational part, we also intend to use platforms with Arduino microcontrollers. The firmware is an open-source Arduino Software , this open source command is used in most DIY projects (do it your self). We hope at the end of the project propose a prototype DIY projects of facilities for determining and gas monitoring pollutants in situ. Initially we will use as NO2 and NO gas for the initial development of the project. Later other gases will be investigated. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVEIRA PETRUCI, JOAO FLAVIO; HAUSER, PETER C.; CARDOSO, ARNALDO ALVES. Colorimetric paper-based device for gaseous hydrogen cyanide quantification based on absorbance measurements. SENSORS AND ACTUATORS B-CHEMICAL, v. 268, p. 392-397, SEP 1 2018. Web of Science Citations: 9.
PASSARETTI FILHO, JULIANO; GOMES VALENTE JUNIOR, MARCO ANTONIO; DE LIMA GOMES, PAULO CLAIRMONT F.; FUGIVARA, CECILIO SADAO; CARDOSO, ARNALDO ALVES. Determination of Fe(III) using digital images: study of corrosion in steel plates using a polyester laser printed device. ANALYTICAL METHODS, v. 9, n. 4, p. 655-663, 2017. Web of Science Citations: 4.
DA SILVEIRA PETRUCI, JOAO FLAVIO; CARDOSO, ARNALDO ALVES. Portable and Disposable Paper-Based Fluorescent Sensor for In Situ Gaseous Hydrogen Sulfide Determination in Near Real-Time. Analytical Chemistry, v. 88, n. 23, p. 11714-11719, DEC 6 2016. Web of Science Citations: 13.

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