A comparative study of the Dichromate and Permanganate methods for the determination of the chemical oxygen demand

Date

10-1993

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Lilia S. P. Madamba

Co-adviser

Elvira T. Tumlos

Abstract

Regalado, Ellen S., University of the Philippines et Los Banos, 1993. A comparative study of the dichromate and permanganate methods for the determination of the chemical oxygen demand.

Advisers: Prof. Lilia S. P. Madamba

Prof. Elvira T. Turnips

The standard dichromate method and the acid permanganate method for the determination of the chemical oxygen demand (COD) were compared using glucose solutions with theoretical COD (ThCOD) ranging from 50 to 1000 ppm; wastewater from a food, non-alcoholic beverage, pulp and paper and textile industries; and surface water from Laguna de Bay. Water and wastewater samples spiked with 50 ppm ThCOD glucose were also analyzed.

For all solutions and sample, analyzed, the dichromate method gave higher COD values and greater coefficient of variation compared to the permanganate method.

Recovery of glucose for the permanganate method was fairly consistent even with varying concentrations. However for the dichromate method, recovery varied with the glucose concentration. Recovery was over 100% for the 50-200 ppm ThCOD solution; while for the solutions with 400-1000 ppm ThCOD, recovery was less than 100%. For the samples with glucose, recovery was generally greater for the permanganate method than for the dichromate method.

At 1% level of significance, permanganate COD and dichromate COD we glucose solutions, surface water sample however, for the textile wastewater, significant. Equations relating the dichromate COD were derived for e analyzed. However, further analysis i validity of the equation for the same sources. the correlation of the re evidently linear for the glucose solutions water samples and wastewater samples; however, for the textile wastewater, linear correlation was not significant. Equations relating the permanganate COD and the dichromate COD were derived for each water and wastewater analyzed. However further analysis is necessary to confirm the validity of the equation for the same type of sample from other sources.

For the water and wastewater samples spiked with 50 ppm COD glucose, the correlations were significantly altered.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1993 C42 R44

Document Type

Thesis

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