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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