Determination of heavy metals in lakebed of Taal Lake, Philippines

Date of Completion

2018

Document Type

Thesis

Degree Name

Bachelor of Science in Medical Laboratory Science

Keywords

Metals, Heavy, Lake

Abstract

The study followed descriptive exploratory design where observation, description and documentation in selected Barangays along Taal Lake, Philippines are part of the process. Collection of water and sediment samples in three (3) different barangays with three (3) depths were done. Water samples approximately 40 mL were placed in each beaker and introduced with concentrated furning nitirc acid, 4 mL afterwards the it will be heated at 90-250 250°C for 4 hours and let it evaporates to 35 mL. When the samples have cooled down, it will be filtered using a number 2 Whatmann filter paper up to three times using ademineralized water for dilution. A 5 g sieved sediment sample, weighed and placed in a beaker and were infused with 25 mL furning nitiric acid then be heated at 90-250 250°C for 6 hours and let it evaporates to 35 mL. It will be filter down using number 2 Whatmann filter paper for three times therefore the samples were diluted to volume using a demineralized water. The digestion process of water and sediment samples was done at De La Salle University-Dasmarinas. Element analysis was quantified through detecting the concentration of heavy metals using AA-7000 by Shimadzu. Based on the results, copper has the highest concentration in the sediments but not in the water, cadmium and nickel were analyzed, the concentration of the two are below detection limit. Lead is not present in both sediment and water. Therefore. the results implied that the levels of heavy metals found in the lake are below the detection limit. This does not mean that the toxic effect of these metals are absent.

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