Sains Malaysiana 46(12)(2017): 2383–2392
http://dx.doi.org/10.17576/jsm-2017-4612-15
Multimedia Environmental Fate and
Transport Model of dichlorodiphenyltrichloroethane (DDT): Case Study
Sayong River Watershed, Johor, Malaysia
(Penentuan Persekitaran Multimedia dan
Model Pengangkutan Diklorodifeniltrikloroetana
(DDT): Kajian
Kes Tadahan Air Sungai Sayong, Johor, Malaysia)
Z.A. GHANI1*,
A.N.
ANUAR2,
Z.A.
MAJID3
& M. YONEDA4
1Department of Environmental Engineering, Faculty of Civil Engineering,
Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor Darul
Takzim, Malaysia
2Department of Environment and Green Technology Malaysia-Japan International
Institute of Technology Universiti Teknologi Malaysia, 81310 UTM,
Johor Bahru, Johor Darul Takzim, Malaysia
3Department of Chemistry Faculty of Science Universiti Teknologi Malaysia,
81310 UTM, Johor Bahru, Johor Darul Takzim, Malaysia
4Department of Environmental Engineering Kyoto University Japan
Diserahkan 16 November
2015/Diterima: 14 Mei 2017
ABSTRACT
This study describes the development
of a multimedia environmental fate and transport model of dichlorodiphenyltrichloroethane
(DDT) at Sungai Sayong watershed.
Based on the latest estimated DDT emission, the DDT
concentrations in air, soil, water and sediment as
well as the transfer processes were simulated under the equilibrium
and steady-state assumption. Model predictions suggested that soil
and sediment was the dominant sink of DDT.
The results showed that the model predicted was generally good agreement
with field data. Compared with degradation reaction, advection outflow
was more important processes occurred in the model. Sensitivities
of the model estimates to input parameters were tested. The result
showed that vapour pressure (Ps) and organic carbon water partition
coefficient (KOC)
were the most influential parameters for the model output. The model
output-concentrations of DDT in multimedia environment is very
important as it can be used in future for human exposure and risk
assessment of organochlorine pesticides (OCPs) at Sungai Sayong Basin.
Keywords: Dichlorodiphenyltrichloroethane
(DDT); modeled concentration; multimedia
environmental fate and transport model; transfer processes
ABSTRAK
Penyelidikan ini membincangkan
pembangunan penentuan persekitaran multimedia dan model pengangkutan
diklorodifeniltrikloroetana (DDT)
di kawasan tadahan air Sungai Sayong. Berdasarkan anggaran terbaru
pelepasan DDT, kepekatan DDT dalam udara, tanah, air dan sedimen termasuk proses
pemindahan telah disimulasi menggunakan andaian keseimbangan dan
keadaan mantap. Model ramalan menyarankan tanah dan sedimen merupakan
dominan semula jadi DDT. Keputusan menunjukkan model ramalan adalah sama dengan
data lapangan. Berbanding tindak balas degradasi, aliran keluar
perolakan haba adalah proses terpenting di dalam model ini. Kepekaan
model anggaran dengan parameter input telah diuji. Keputusan menunjukkan
tekanan wap air (Ps) dan pekali pembahagi karbon organik - air (KOC)
adalah parameter paling berpengaruh dalam output model. Output kepekatan
model DDT
dalam persekitaran multimedia adalah sangat penting
kerana ia dapat digunakan pada masa hadapan untuk pendedahan kepada
manusia dan penilaian risiko racun serangga organoklorin (OCP) di lembangan Sungai Sayong.
Kata kunci: Diklorodifeniltrikloroetana (DDT);
kepekatan model; pembangunan penentuan persekitaran multimedia dan
model pengangkutan; proses pemindahan
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*Pengarang untuk surat-menyurat; email:
zairawatiabghani@yahoo.com
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