Accumulation of cadmium and lead in Enhalus acoroides (tape seagrass) species in Brgy. Alegria, Semirara Island, Caluya, Antique, Philippines

VENISE JAN C. CASTILLON, GIEBERLINE DYNE A. AMBUT, PRINCESS JOY D. TINDAN, and HAROLD P. MEDIODIA
Philippine Science High School – Western Visayas Campus, Brgy. Bito-on, Jaro, Iloilo City 5000, Department of Science and Technology – Science Education Institute, Philippines


Abstract
Seagrass meadows are a critical component of the marine ecosystems worldwide and are sensitive to changes in the environment. Semirara, Antique operates the biggest open pit coal mines in the Philippines since 1980. Heavy metals are one of the waste products from mining which can accumulate in living organisms, posing a threat to their health. In this study, seawater, sediment, and Enhalus acoroides (tape seagrass) samples were collected from Brgy. Alegria, Semirara and analyzed using Microwave Plasma – Atomic Emission Spectroscopy (MP-AES) to determine the accumulation of cadmium and lead. Results showed that concentrations for Cd and Pb in seagrass roots were as follows: Cd (<0.009) and Pb (0.061 ± 0.008) while concentrations in seagrass leave were: Cd (<0.009) and Pb (0.067 ± 0.005). Concentration of Cd decrease in the following order: seawater > seagrass leaves > seagrass roots > sediments while concentrations of Pb decrease in the order: seagrass roots > seagrass leaves > seawater > sediments.

Keywords: seagrass, cadmium, lead, Enhalus acoroides, mp-aes


Porous ceramic modified with hydrous manganese oxide as potential sorbent of cadmium and lead in water

CRIS JERICHO G. CRUZ1, DARYL JOHN A. LIBIANO1, RIENYL AIKEN M. BACONGALLO1, RAMON ANGELO N. SINCO1,
and NORWELL BRIAN C. BAUTISTA2
1Philippine Science High School – Western Visayas Campus, Brgy. Bito-on, Jaro, Iloilo City 5000, Department of Science and Technology – Science Education Institute, Philippines
2University of the Philippines Visayas, Miagao, Iloilo 5023, Philippines


Abstract
Hydrous manganese oxide (HMO) is capable of adsorbing heavy metals in water, specifically cadmium and lead. HMO was integrated into porous ceramic water filter using 3-minotriethoxysilane (APTES) as a coupling agent. Three porous ceramic samples, one modified with HMO using APTES, another modified with HMO without APTES, and one unmodified porous ceramic, were viewed under a JEOL JSM-5510LV model Scanning Electron Microscope to view their external morphological structures. Images show that porous ceramic modified with HMO using APTES have serrated bulb-like structures compared to the amorphous covering exhibited by the porous ceramic modified with HMO only. The porous ceramic modified with HMO was then exposed to cadmium and lead solutions of known concentrations. The amount of the heavy metals in the solution was then quantified using Agilent Microwave Plasma-Atomic Emission Spectrometer system. The analysis shows that porous ceramic modified with HMO using APTES results to lower amounts of cadmium and lead in water samples compared to porous ceramic only.


Keywords: heavy metals, porous ceramic, hydrous manganese oxide, lead, cadmium