Malaysian
Journal of Analytical Sciences Vol 25 No 1
(2021): 166 - 183
Natural radioactivity of 210Pb in mussels at the semi-enclosed water of the
Johor Strait, Malaysia through statistical approach
(Radioaktiviti Semulajadi 210Pb
dalam Kupang di Perairan Separa-Tertutup Selat Johor, Malaysia Melalui
Pendekatan Statistik)
Noor
Affizah Bujang Saili and Che Abd Rahim Mohamed*
Department of Earth Sciences and Environment,
Faculty of Science and Technology
Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia
*Corresponding author: carmohd@ukm.edu.my
Received: 10 August 2020;
Accepted: 11 November 2020; Published: 20 February 2021
Abstract
Mussel and
seawater samples were collected along the Johor Strait during the northeast
monsoon, inter-monsoon, and southwest monsoon. The aim of this study is to
determine the allometric relationship of 210Pb and investigate the 210Pb
content in mussel tissues where there is semi-enclosed water flow. The
statistical tests (ANOVA) indicate an insignificant relationship between
mussel condition indexes (Ci) related
to seasons and geography. A high level of 210Pb in mussels (mean:
29.33±6.65 Bq kg-1 dry weight) was measured during inter-monsoon
with less dissolved oxygen content (< 3.0 mg L-1).
The causeway structure disrupts water quality and
conditions in the Johor Strait and causes almost hypoxic conditions in its vicinity. That dissolved oxygen in the water column is inversely proportional to 210Pb
in mussels proves that oxygen deficiency is influenced the bioaccumulation of 210Pb
in mussels.
Keywords:
Johor
Strait, dissolved oxygen, hypoxia, monsoon, 210Pb
Abstrak
Sampel
kupang dan air laut diambil di sepanjang Selat Johor pada musim monsun timur
laut, inter-monsun dan monsun barat daya. Matlamat kajian ini adalah untuk
menentukan hubungan allometrik 210Pb dan mengkaji kandungan 210Pb dalam
tisu kupang khususnya di perairan separa-tertutup. Ujian statistik (ANOVA) menunjukkan hubungan yang tidak signifikan di antara indeks keadaan
kupang (Ci) terhadap perubahan musim dan keadaan geografi. Kandungan
210Pb yang tertinggi dalam kupang (min: 29.33±6.65 Bq kg-1
berat kering) diperolehi pada musim
inter-monsun di mana kandungan oksigen terlarut adalah pada paras yang rendah
(< 3.0 mg L-1). Struktur tambak telah menyekat aliran air dan
menyebabkan kualiti air di perairan Selat Johor menghampiri keadaan hipoksik.
Kandungan oksigen terlarut dalam turus air berkadar sonsang terhadap kandungan 210Pb
dalam kupang dan ini membuktikan kekurangan oksigen teralarut mempengaruhi
bioakumulasi 210Pb dalam kupang.
Kata kunci: Selat Johor,
oksigen terlarut, hipoksia, monsun, 210Pb
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