CONSTRUÇÃO DE UM ESPECTROFOTÔMETRO DE BAIXO CUSTO UTILIZANDO ARDUINO: FUNDAMENTOS FÍSICOS E MATEMÁTICOS
CONSTRUÇÃO DE UM ESPECTROFOTÔMETRO DE BAIXO CUSTO UTILIZANDO ARDUINO: FUNDAMENTOS FÍSICOS E MATEMÁTICOS
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DOI: https://doi.org/10.22533/at.ed.073112616013
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Palavras-chave: arduino, espectrofotômetro, eletrônica, química analítica
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Keywords: arduino, spectrophotometer, electronics, analytical chemistry
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Abstract: Spectrophotometry is an analytical technique based on the property of chemical compounds to absorb light beams of specific wavelengths. Its configuration involves placing a sample between an emitter—whose light is diffracted by a monochromator into distinct wavelengths—and a detector. Analyte concentration is determined according to the detected signal, adhering to the Beer-Lambert Law, which establishes a directly proportional relationship between absorbance and transmitted light intensity. This work proposes the development of a low-cost spectrophotometer for determining solution concentrations within the visible light spectrum. White light emission, monochromator rotation, and output signal reception are controlled via an Arduino board. The white light source consists of an LED, while the diffraction grating is fabricated from a DVD segment. Given its precision limitations, the device is suitable for teaching spectroscopic techniques. Validation will include reproducibility testing, detection limit determination, analytical curve linearity assessment, and comparison with commercial spectrophotometers to ensure the reliability of the proposed method for qualitative and semiquantitative analyses.
- Daniel Moraes Santos