Assessment of chromium absorption capacity of water lettuce (Pistia Stratiotes L.)

Date

10-2013

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Teofila DC. Villar

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The ability of Pistia stratiotes L. to absorb chromium in treated medium was studied for its capacity for phytoremediation - an emerging technology for effective cleanup of contaminated sites. The Cr absorption was evaluated using Flame Atomic Absorption Spectroscopy. Optimization process showed that highest Cr absorption of water lettuce was ar 9 mg/L. Absorptive capacity of the plant was assessed by exposing the plant to 15 mg/L solutions for 30 days. At the sixth day, the plant exhibited the highest absorption with 12.63 mg Cr. The classification of the plant based on its ability for phytoremediation was assessed. Calculations showed that the plant exhibited metal uptake greater than 1000 ug/g. The amounts of the Cr in treated samples were atleasr 10 times higher than the blanks. Bioconcentration factor (BCF) values exxceed one and translocator factor (TLF) is less than one implying that Cr metal mainly accumulated in the roots. Results classify the plant as a metal excluder for Cr. Method validation was assessed through analytical parameters such as lineraity, precision, percent recovery, LOD and LOQ. percent recoveries ranged from75.17 to 112.77. The limit of detection (LOD) and limit of quantitation (LOQ) are 0.0660 mg/L and 0.2199 mg/L respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2013 C42 /C33

Document Type

Thesis

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