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Determination of Concentration and Diffusion Coefficient of Arsenic and Manganese in Santo Angel Production Well by Voltammetry (2014-2015)

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  • Determination of Concentration and Diffusion Coefficient of Arsenic and Manganese in Santo Angel Production Well by Voltammetry (2014-2015)

Thesis Archive

Determination of Concentration and Diffusion Coefficient of Arsenic and Manganese in Santo Angel Production Well by Voltammetry (2014-2015)

Kerwin C. Cheng
Michelyn T. Co

Abstract:

-The Santo Angel Production Well in San Pablo, Laguna, contains trace elements such as arsenic, cadmium, iron, lead, and manganese. Among these trace heavy metals; manganese had exceeded the standard limit set by the Philippine National Standards for Drinking Water (PNSDW) of 0.40 mg/L. Likewise, arsenic, cadmium, and lead are suspected carcinogens with detectable amounts. Struggling with water contamination, the authorities of San Pablo Water District (SPWD) were forced to cease operation in the said well. Arsenic and manganese are naturally occurring elements that exist in some soils and enters into ground water. Voltammetry is an electroanalytical method that can determine trace heavy metals in liquid solution. This study focused on the determination of the concentration levels and diffusion coefficients of trace arsenic and manganese in Santo Angel Production Well by using linear sweep voltammetry and differential pulse anodic stripping voltammetry. In this study, all the samples were tested using the EGandG Princeton Applied Research Potentiometer and eDAQ E-Corder. Using a glassy carbon electrode as a working electrode, an Ag/AgCl electrode as a reference electrode, and a platinum wire electrode as a counter electrode, the peak voltage determined from the voltammogram produced by using differential pulse anodic stripping voltammetry for arsenic was 0.0092514 V. The level of arsenic content in the raw water and treated water from the well was found to be 0.00079 mg/L and 0.00042 mg/L respectively. The peak voltage determined from the voltammogram produced by using linear sweep voltammetry for manganese was 0.30 V. The level of manganese content in the raw water and treated water from the well was found to be 0.61 mg/L and 0.50 mg/L respectively. The diffusion coefficient values were calculated to be 0.38 cm2/s for arsenic and 0.13 cm2/s for manganese.

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Dr. Nathaniel P. Dugos
Dr. Josephine Q. Borja

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