Fractionation of phosphorus in the sediments of Laguna de Bay

Date

10-1995

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Carlito R. Barril

Abstract

Siscar, Ronaldo Mendoza. College of Arts and Sciences University of the Philippines Los Banos, 1995. FRACTIONATION OF PHOSPHORUS IN THE SEDIMENTS OF LAGUNA BAY.

Adviser: Dr. Carlito R. Barril

Sediment samples from six sites in the lake, three East Bay and three from West Bay, were collected and subjected to a sequential extraction scheme for the fractionation of soil inorganic phosphates. The different inorganic fractions determined were: aluminum phosphate. iron phosphate, calcium phosphate, reductant-soluble iron phosphate and occluded aluminum-iron phosphate. Total Organic Phosphorus was taken as the difference between Total Phosphorus and Total Inorganic Phosphorus.

For both bays the predominant inorganic fractions were iron phosphate and calcium phosphate, with West Bay having relatively more of the former (2.51 ppm compared to 2.23 ppm P for calcium phosphate) and East Bay having relatively more of the latter (1.72 ppm compared to 1.44 ppm P for iron phosphate). Generally, West Bay had relatively higher amounts of total inorganic, total organic and total phosphorus (5.91, 1.76, and 7.67 ppm P, respectively. compared to 4.17, 1.40, and 5.65 ppm P, respectively for East Bay). Aluminum phosphate and occluded aluminum-iron phosphate were among the lowest inorganic fractions obtained for both bays (0.12 ppm and 0.12 ppm P, respectively for East Bay, and 0.25 ppm and 0.10 ppm P, respectively for West Bay).

Statistical analysis revealed that site-to-site variations were not significant for both bays except for reductant-soluble iron phosphate, but bay-to-bay variations were significant except for the same fraction.

The study concludes that the forms and amounts of the different phosphorus fractions were a function of a number of variables including inputs from the surrounding establishments as well as the hydrodynamics of the lake.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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