Levels of cadmium, chromium, copper, lead and zinc in bivalve mollusk (Corbicula manilensis) and shrimp (Penaeus sp.) from Laguna de Bay

Date

5-1993

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Lilia S. P. Madamba

Abstract

Bivalve mollusk (Corbicula manilensis) and shrimp (Penaeus sp.) were collected from the East and West Bays of Laguna de Bay in December 1992 and April 1993. The samples were analyzed for cadmium, chromium, copper, lead and zinc by atomic absorption spectrophotometry. The mollusk flesh tissue gave significantly higher cadmium, copper and zinc mean concentrations of 0.54 ppm, 33.09 ppm and 110.68 ppm respectively in April than the 0.35 ppm, 15.62 ppm and 82.00 ppm respectively in December. Significantly higher mean values were also observed in West Bay samples with 0.61 ppm for Cd, 28.88 ppm for Cu and 118.22 ppm for Zn than the East Bay samples with 0.28 ppm, 19.84 ppm and 74.45 ppm respectively. Chromium and lead were not detected in the mollusk sample. Shrimp tissues were divided into edible and inedible portion. Edible tissue was found to contain significantly lower mean concentrations of 0.25 ppm, 0.18 ppm, 15.29 ppm and 66.16 ppm for Cd, Cr, Cu, Pb and Zn respectively than the inedible tissue with 0.43 ppm, 0.54 ppm, 135.17 ppm and 127.21 ppm respectively. Lead was not detected in the edible tissue of shrimp. On the other hand, shrimp size gave significantly different mean values of 0.38 ppm, 0.40 ppm, 79.38 ppm, 5.12 ppm and 105.21 ppm for Cd, Cr, Cu ,Pb and Zn respectively in small shrimps as compared to the big shrimps with 0.31 ppm, 0.30 ppm, 71.09 ppm, 4.28 ppm and 88.17 ppm respectively. April and December samples gave significantly different values for Cd, Cr and Pb while no significant difference was observed for Cu and Zn. The heavy metals mean concentrations in West Bay and East Bay samples showed no significant difference. In general, the concentrations of cadmium, chromium, copper, lead and zinc in the edible tissue of mollusk and shrimp are within the safe levels for human consumption based on the guidelines set by the World Health Organization.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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