merged

EVALUATION OF METALS TOXICITY IN NATURAL SEDIMENT FROM
SUNGAI SEMERAK ON Chironomus kiiensis
Siti Rusyahira Nur Salwani binti Rusdi
Supervisor: Dr Nurulnadia binti Mohd Yusoff
Bachelor of Science (Marine Science)
School of Marine and Environmental Sciences
Concentration of selected metals (Al, Mn, Fe and Hg) in the Sungai Semerak sediment
from five stations were studied in order to understand metals contamination due to
construction and activities. The sediment collected using Ponar Grab and transferred
to laboratory to analyze sediment toxicity test to record endpoint of Chironomus
kiiensis. The metal digestion analysis using ICP-MS and TOC analysis using SSM-5000A
(TOC analyser). The laser diffraction (PSA) were undergo to state the sediment particle
size. Normal growth of chironomid delayed due to long-term influence of metals. The
strength of correlation(r>0.80), shows metals, mean particle size and TOC seems not
correlated and not act as main factor but partially affect the mortality and delayed
emergence rate of C. kiiensis. The organisms in the benthic community of soft
sediments usually cover the lowest trophic level and has the vital role for the food web
interaction thus influence the diversity of an ecosystem.
1919 | UMT UNDERGRADUATE RESEARCH DAY 2018