Quantitative Analysis Laboratory Experiment: Bilinear Regression Analysis as a Means to Reduce Matrix Effects in Simultaneous Spectrophotometric Determination of Cr(III) and Co(II)

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Article on bilinear regression analysis as a means to reduce matrix effects in simultaneous spectrophotometric determination of Cr(III) and Co(II) and a quantitative analysis laboratory experiment.

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3 p.

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Pandey, Siddharth; McHale, Mary E. R.; Coym, Karen S. & Acree, William E. (William Eugene) July 1, 1998.

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  • Main Title: Quantitative Analysis Laboratory Experiment: Bilinear Regression Analysis as a Means to Reduce Matrix Effects in Simultaneous Spectrophotometric Determination of Cr(III) and Co(II)
  • Added Title: Bilinear Regression Analysis as a Means to Reduce Matrix Effects in Simultaneous Spectrophotometric Determination of Cr(III) and Co(II): A Quantitative Analysis Laboratory Experiment

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Description

Article on bilinear regression analysis as a means to reduce matrix effects in simultaneous spectrophotometric determination of Cr(III) and Co(II) and a quantitative analysis laboratory experiment.

Physical Description

3 p.

Notes

Abstract: An undergraduate laboratory experiment is designed for the simultaneous determination of both Co(II) and Cr(III) in unknown liquid mixtures based upon a bilinear least squares regressional analysis of measured absorbance data. Unlike several published laboratory experiments, in our method standard solutions contain both ions. Numerical values of the four molar absorpti-vities are calculated from a least squares of analysis of the Beer-Lambert law expression for two light-absorbing species. From an educational standpoint, our modification gives students greater exposure to standard curve-fitting techniques and provides a convenient means to introduce computer programming and/or spreadsheet computations into the laboratory portion of the course. Cobalt (II) and chromium (III) concentrations determined using the bilinear regression method fall within 1-2 % of the correct values.

Reprinted with permission from the Journal of Chemical Education. Copyright 1998 American Chemical Society.

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  • Journal of Chemical Education, 1998, Washington D.C.: American Chemical Society, pp. 878-880

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  • Publication Title: Journal of Chemical Education
  • Volume: 75
  • Issue: 7
  • Page Start: 878
  • Page End: 880
  • Peer Reviewed: Yes

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  • July 1, 1998

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  • Oct. 23, 2014, 12:02 p.m.

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  • June 25, 2015, 10:20 a.m.

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Pandey, Siddharth; McHale, Mary E. R.; Coym, Karen S. & Acree, William E. (William Eugene). Quantitative Analysis Laboratory Experiment: Bilinear Regression Analysis as a Means to Reduce Matrix Effects in Simultaneous Spectrophotometric Determination of Cr(III) and Co(II), article, July 1, 1998; [Washington, D.C.]. (digital.library.unt.edu/ark:/67531/metadc406364/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.