Abstract

MONTOYA ROSSI, Eduardo; BALTUANO ELIAS, Óscar  and  ARBILDO LOPEZ, Aurelio. Low cost and high performance homemade spectrometer for visible radiation. Rev. Soc. Quím. Perú [online]. 2013, vol.79, n.1, pp.80-91. ISSN 1810-634X.

A problem of teaching and learning of instrumental chemical analysis is the high cost of commercial instrumentation, including aspects of maintenance and service. This limits the access of the students to the direct operation of the instruments, compromising the quality of their professional formation. In this work, a homemade spectrometer for visible light of 390 - 650 nanometers is described in detail. The instrument is of easy construction, low cost, robust and of high performance, being useful for spectrometry of molecular absorption, molecular fluorescence and atomic emission. The spectrometer has no mobile parts and uses as detector a web cam, connected to a PC, allowing the acquisition, presentation, processing and recording of the spectra, under controlled conditions chosen by the experimenter. The grating is a piece of the metallic layer of a virgin DVD, exposed in order to get a first surface reflective grating and the light is transmitted to the grating by means of a piece of an acrylic optical fiber. The components of the instrument are rigidly mounted on a darkened aluminum plate. Examples of obtained spectra and absorbance measurements are presented and the advantages and limitations of the instrument are discussed.

Keywords : Spectrophotometry; Chemical Instrumentation; Photometric Analysis; Instrumental Chemical Analysis.

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