Toxicity Identification Evaluation Of Landfill
Leachate Taking A Multispecies Approach
Author(s)
B. A. Suliasih, M. S. Othman, L. Y. Heng & S. Salmijah
Abstract
In this study, the first phase of Toxicity Identification Evaluation (TIE) was used
to characterise the major toxicants present in a Malaysian landfill leachate, using
multispecies bioassay. Freshwater fish (Rasbora sumatrana), freshwater prawn
(Macrobrachium lanchesteri) and tomato seeds (Lycopersicon esculentum) were
chosen as test species based on local availability, as well as their broad
sensitivity for environmental toxicants. Physico-chemical fractionation steps
(oxidant reduction with sodium thiosulphate, EDTA chelation, pH adjustment,
pH adjustment followed by filtration, aeration, extraction with solid phase C18
column (SPE), and graduated pH analyses) were carried out. The results show
that the major toxicants were mostly basic in nature, precipitable under acidic
conditions and contained non-polar organic compounds. The small reductions in
toxicity observed when treated with sodium thiosulphate indicate the presence of
oxidizers. The EDTA chelating step did not significantly reduce toxicity in the
test organisms, suggesting insignificant levels of (toxic) metals. The formation of
emulsion when mixed with crude oil indicates the presence of surfactant.
Keywords: toxicity identification evaluation, landfill leachate, bioassay,
surfactant.
1 Introduction
Leachates are the liquid generated by the percolation of rainwater and moisture
through the layers of wastes in landfills or dumping areas (Koshy [1]). Landfill
leachates may contain substantial amounts of dissolved organics, xenobiotic
Keywords
toxicity identification evaluation, landfill leachate, bioassay,
surfactant
Related Book
Other papers in this volume
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