Document Detail


A portable, inexpensive and microcontrolled spectrophotometer based on white LED as light source and CD media as diffraction grid.
MedLine Citation:
PMID:  19064105     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A portable, microcontrolled and low-cost spectrophotometer (MLCS) is proposed. The instrument combines the use of a compact disc (CD) media as diffraction grid and white light-emitting diode (LED) as radiation source. Moreover, it employs a phototransistor with spectral sensitivity in visible region as phototransductor, as well as a programmable interrupt controller (PIC) microcontroller as control unit. The proposed instrument was successfully applied to determination of food colorants (tartrazine, sunset yellow, brilliant blue and allura red) in five synthetics samples and Fe(2+) in six samples of restorative oral solutions. For comparison purpose, two commercial spectrophotometers (HP and Micronal) were employed. The application of the t-paired test at the 95% confidence level revealed that there are not significant differences between the concentration values estimated by the three instruments. Furthermore, a good precision in the analyte concentrations was obtained by using MLCS. The overall relative standard deviation (R.S.D.) of each analyte was smaller than 1.0%. Therefore, the proposed instrument offers an economically viable alternative for spectrophotometric chemical analysis in small routine, research and/or teaching laboratories, because its components are inexpensive and of easy acquisition.
Authors:
Germano Veras; Edvan Cirino Silva; Wellington Silva Lyra; Sófacles Figueredo Carreiro Soares; Thiago Brito Guerreiro; Sérgio Ricardo Bezerra Santos
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Publication Detail:
Type:  Journal Article     Date:  2008-08-27
Journal Detail:
Title:  Talanta     Volume:  77     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-09     Completed Date:  2009-01-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  1155-9     Citation Subset:  -    
Affiliation:
Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil.
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