Evaluation of the water quality of Tadlak Lake

Date

10-1998

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Maxima E. Flavier

Co-adviser

Elvira T. Tumlos

Committee Member

Veronica P Migo

Abstract

Monitoring of the water quality of Tadlak Lake was done for a period of six months (January to June 1997) from six sites that were identified from previous studies Physical and chemical parameters such as pH, dissolved oxygen, temperature. conductivity, TSS, BOD, COD, total hardness, chloride, alkalinity, nitrogen and phosphorous fractions were evaluated Results showed that the mean temperature values were 29 9 and 28 5°C for surface and bottom water, respectively which were within the DENR permissible limit (25-34°C). The mean dissolved oxygen concentrations for both surface and bottom water were 4.15 and 1.36 mg/L, respectively, which were below the minimum DENR limit of 5 mg/L The pH of the lake tend to be on the alkaline side (pH 6 66-9 73) with a total alkalinity mean value of 272 18 mg/L The total hardness of the lake (75 mg/L) falls under the category of moderately hard water. The total suspended solids and conductivity values were 2 59 mg/L and 86 5- 111 0 mS/cm, respectively The BOD and COD, with an average value of 5 49 mg/L and 12 08 mg/L respectively, were lower than the tolerable limits for class C waters The chloride content of the lake was relatively high (165 38 mg/L) but was still below the maximum limit of 250 mg/L Nitrogen and phosphorus contents were much higher than the permissible limits Diurnal monitoring showed that both temperature and dissolved oxygen concentration increased significantly during daytime and decreased during nighttime Similar results were observed for the pH while conductivity values were relatively constant pH, DO, conductivity, and temperature decreased from surface to bottom (9 m). Variation in the values with respect to time and site are mostly significantly different except for the variation in phosphorus concentrations with respect to sampling site The water quality of the lake had significantly deteriorated as compared with the results of the previous studies of Claveria, 1996 and Gonzales, 1996. Such situation threatens the lake as a fishery resource especially if the communal activities will not be controlled

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1998 A13 H47

Document Type

Thesis

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