Digital photometric analysis of chromium and manganese in steel.

Date

5-2010

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Ernesto J. del Rosario

Abstract

VEDAD, JAYSON DR. Institute of Chemistry, College of Arts and Sciences, University of the Philippines Los Baños, May 2010. Digital Photometric Analysis of Chromium and Manganese in Steel.

Adviser: Dr. Ernesto J. del Rosario

Co-adviser: Prof. Josefina L. Solivas

Committee Member: Engr. Conrado P. Monterola, Jr.

The chromium and manganese content of steel was determined by oxidation to dichromate and permanganate, respectively, using digital photometric analysis. Standard spectrophotometric methods were done in order to validate the results of digital photometry. Digital still photographs of dichromate and permanganate solutions were taken using 10 megapixel NIKON Coolpix L20 and 12 megapixel OLYMPUS FE-46 digital cameras. RGB values were determined from the photographs using the RGB analysis of Image Colors (RGB-AIC) and SI Color Picker softwares. G-B and a*-b* plots were constructed in order to calculate the analyte concentrations; these concentrations were compared with those determined from interpolated spectrophotometric data.

Comparison of the concentrations derived from the RGB data from photographs taken using the 10 megapixel and 12 megapixel digital camera showed no significant difference at 95% confidence level. Concentrations computed using RGB values from the RGB-AIC and SI ColorPicker also showed no significant difference at the same level of confidence. The concentrations computed from the G-B plots were comparable 95% confidence level to the calculated concentrations from visible spectrophotometry. Concentrations computed from the a*-b* plots were found to be significantly different from the visible spectrophotometric data; G-B plot was found to me more accurate for computing chromium and manganese concentrations. The digital photometric analysis was observed to be reproducible and accurate and can be an alternative method of analyzing chromium and manganese when expensive spectrophotometers are unavailable

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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