Colorimetric analysis of aluminum using digital photometry

Date

5-2011

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Ernesto J. Del Rosario

Co-adviser

Charisse T. Reyes

Committee Member

Marlon M. Manalo

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Abstract

The aluminum concentration of a tap water sample was determined using digital photometry. The method made use of a digital camera, a light box, a computer, and software called RGB Analysis of Image Colors. Three methods for the calculation of Al3+ concentration were employed – the use of RGB plots, percentage luminance plots, and L*a*b* plots. The colorimetric method employed made use of a schiff base called 2- hydroxynaphthaldehydebenzoylhydrazone as the coloring agent for aluminum. The light box was optimized prior to the actual experiment using solutions of potassium permanganate. Spectrophotometry was also applied for the determination of aluminum concentration to confirm the results of the digital photometric methods used. The calculated concentrations of the sample obtained from digital photometry, which range from 0.041 to 0.046 mg/l, and that obtained from spectrophotometry, 0.042 mg/l, were found to be comparable at 95% confidence level. Using the same standard curves obtained from the analyses and a solution of known concentration (0.060 mg/l), the validation of accuracy was accomplished. Spectrophotometric (0.063mg/l) and digital photometric (0.064-0.069 mg/l) results were found to be comparable at 95% confidence level. Moreover, the analyses were repeated using a new set of standard and sample solutions. T-test showed that the results of the first experiment and the second one are comparable at 95% confidence level. Thus, digital photometric analyses using the light box were accurate and repeatable.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Document Type

Thesis

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