Water quality assessment of Santa Rosa River

Date

4-2002

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Maxima E. Flavier

Abstract

Tapay, Cloudette A., College of Arts and Sciences, University of the Philippines Los Banos. Water Quality Assessment of Santa Rosa River.

Adviser: Dr. Maxima E. Flavier

The water quality of Santa Rosa River was monitored from the month of July to October 2001. The water quality parameters monitored were temperature, pH, turbidity, conductivity, and dissolved oxygen (DO) which were determined in situ, and biochemical oxygen demand (BOD), chemical oxygen demand (COD), total dissolved solids (TDS), total suspended solids (TSS), hardness, nitrogen fractions (nitrate-nitrogen, nitrite-nitrogen and total Kjeldahl nitrogen), total phosphorus, and metal concentrations (Zinc, Copper, and Lead) which were analyzed in the laboratory.

The temperature and conductivity readings gave means of 28.4 °C and 0.78 respectively. The pH values were within the normal range of 6.5-8.5 for "Class C and Class D" waters. High TDS and TSS were noted for Sites 4 and 2 respectively. Turbidity level gave a range of 7-33, the highest of which was for site 2. Most DO levels were below the 5.00 mg/L permissible limit for DO, except for Site I (upstream). COD loadings did not go beyond the allowable limit of 50 mg/L except for Site 4 with a mean of 73.37 mg/L. BOD loadings at site 2 were above the permissible limit of 5.00 mg/L for "Class A and B". The mean concentrations of TKN, nitrate-nitrogen and nitrite-nitrogen were 1.316 mg/L, 1.0164 mg/L, and 0.0440 mg/L, respectively. Site I exhibited high nitrate concentrations while sites 4, 3, and 2 exhibited high TKN values. Values of the total phosphorus showed an increasing trend downstream, towards the lake. Concentrations of Zn and Cu were highest at Site 3 and were lowest at Site I. Lead concentrations in the waters were not detected.

Variations of all the parameters were found to be highly significant with respect to sampling sites and sampling dates (except for hardness, COD, TKN and nitrate-nitrogen)

The lack of domestic sewage system, industrial effluents from nearby plants and factories, as well as agricultural runoffs from farms contribute to the observed deteriorating water quality, of Santa Rosa River. 'thus, it is worthwhile to monitor continuously the water quality of the river since thus is a tributary of Laguna de Bay

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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