Surfactant levels and some water quality parameters in selected groundwater sites in Cabuyao, Laguna

Date

4-2006

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nieva T. Librojo-Basilio

Abstract

RAMIL, CARLO PUA, College of Arts and Sciences, University of the Philippines Los Banos. April 2006. SURFACTANT LEVELS AND SOME WATER QUALITY PARAMETERS IN SELECTED GROUNDWATER SITES IN CABUYAO. LAGUNA.

Adviser: Dr. Nieva T. Librojo-Basilio

Surfactant levels and some water quality parameters in selected groundwater sites in Cabuvao, Laguna were monitored. Surfactant levels were analyzed using the Methylene Blue Active Substances (MBAS) Method. The physical parameters measured were pH, temperature. and total dissolved solids. The chemical parameters taken into consideration were nitrate-nitrogen. total hardness. chloride and lead. Coliform count was used as the biological parameter.

Surfactant levels in groundwater from ten sampling sites fell in the range of 0.0630 to 0.6280 mg MBAS/L. The pH. temperature. and total dissolved solids ranged from 6.76 to 7.90. 27.0 to 29.5 °C. and 403 to 1384 mg/L, respectively. The lead, chloride and nitrate-nitrogen concentration were in the range of 0.0326 to 0.0792, 0.15 to 100.29. and 1.93 to 2.36 mg/L, respectively. Total hardness was from 161.52 to 385.67 mg CaCOilL. Coliform count of groundwater ranged from < 1-7 MPN/100mL. Lead content. total dissolved solids and surfactant level of groundwater from some of the sampling sites exceeded the Maximum Allowable Limit (MAL) set by the Department of Environment and Natural Resources for Class A drinking water (DAO #34, 1994) and the Philippine Water Quality Standards for Drinking Water (DOH A0 18-A). Sites 5 to 10 contained lead in amounts higher than the MAL (0.05 mg/L). ranging from 0.0509 to 0.0792 mg/L. The MAL for TDS is 1000 mg/L. Sites 4. 6, and 8 went over this limit: with values ranging from 1052 to 1384 mg/L. Surfactants as MBAS in sites 3. 7. and 8 were in levels higher than the MAL of 0.2 mg/L with values of 0.2076, 0.3340 and 0.6280 mg/L, respectively.

Analysis of Variance inferred that the location of sampling site significantly affected the variations in the measured values of temperature. and nitrate-N concentrations in groundwater at 1% level while pH. total hardness, chloride and lead concentrations were affected at 5% level. The time of sample collection had significant effect on the variations in temperature readings at 5% level. Variations in total dissolved solids were significant at 1% level with respect to depth of well. The effect of the age of well was highly significant on the variations in the measured values of pH. total dissolved solids, total hardness, chloride and lead concentrations in groundwater at 1% level.

The measured levels of surfactants in eight of the ten sampling sites in Cabuyao, Laguna were not significantly different when compared with the previous levels measured in similar studies conducted by Librojo-Basilio et al. (2005), Roxas (20041, and Vasquez (2004). Surfactant level was highest in the site located inside a creek. However. surfactant levels did not vary significantly with respect to the location of sampling sites, age and depth of wells and age-depth interaction.

Groundwater from Sites 1 and 2 is safe for drinking based on the parameters measured as compared to the allowable range for Class A (drinking water) set by the ENR (DAO #34, 1994) and the Philippine Water Quality Standards for Drinking Water OH-AO 18-A. 1994.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2006 C4 R36

Document Type

Thesis

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