Water quality assessment of Tadlac Lake

Date

10-1996

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Maxima E. Flavier

Co-adviser

Amelia W. Tejada

Committee Member

Lilla S. P. Madamba

Abstract

The water quality of Tadlak Lake was evaluated from July to February using some physical and chemical characteristics. These parameters include dissolved oxygen, pH, transparency. temperature, conductivity. TSS. BOD, total hardness, chloride, alkalinity. COD. nitrogen and phosporous fractions Results showed that the temperature of Tadlak Lake varied from 25°C -34°C. Temperature and dissolved oxygen of the surface water were higher than the temperature of the 4-m depth water. The dissolved oxygen of the surface and bottom water were lower (0.38 and 0.35 mg/L) than the permissible limit (5 00 mg/L) during the months of November and December. The lake had alkalinity mean value of 231 09 mg/L with pH values ranging from pH 6 40 to pH 8 60 The transparency values were relatively low with a mean of 114 76 cms The conductivity and total suspended solids mean values were 122.21 mS/cm and 11 31 mg/L. respectively The BOD and COD concentrations with mean values of 2 23 mg/L and 11 32 mg/L. respectively were lower than the maximum allowable concentrations of oxygen demand for all sampling stations. The chloride concentrations were appreciably high but still below the permissible standard for Class C waters (250 00 mg/Q. Water in the lake was considered moderately hard with a mean hardness value of 67.58 mg/L expressed as CaCO3. Phosporous fractions (total-P- 0.348 mg/L: ortho-P 0 176 mg/L) were relatively higher than the maximum limit Nitrogen fractions were higher than the permissible limit except for nitrates. Statistical analysis showed that the nutrient concentrations were significantly different with respect to sampling time and sampling sites (except for phosporous fractions and ammonia) Diurnal monitoring was done in December Results showed that dissolved oxygen of the surface water was at maximum at 12:00 noon and lower during the night The temperature measured for eighteen hours were relatively constant Statistical analysis showed that variation in the values for almost all parameters were not significantly different within sites (except for nitrates and total nitrogen). Variations in sampling time however were significantly different for all parameters The results of this study were compared with those values reported by Enriquez (1993). There were significant changes in the physico-chemical characteristics of the water Such conditions may threaten 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 1996 C4 G66

Document Type

Thesis

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