Distribution of Linear Alkylbenzenes (Labs) in Selected Sediments of Sarawak Kuching and Sembulan Rivers
Sleman Magam, Sami Muhsen and Zakaria, Mohammad Pauzi and Halimoon, Normala (2009) Distribution of Linear Alkylbenzenes (Labs) in Selected Sediments of Sarawak Kuching and Sembulan Rivers. In: Proceedings of Postgraduate Qolloquium First Semester 2009/2010, 26-29 October 2009, Faculty of Enviromental Studies, Universiti Putra Malaysia.
Kuching and Kota Kinabalu rivers are located in the East of Malaysia. The major activities in these cities are human; tourism activities. Linear alkyl benzene (LABs) considered as one of the organic pollutants that has resistant degradation and toxicity influence in the environment. The term alkyl benzenes (LABs) has been used to describe a group of phenyl alkanes having a benzene ring attached at any position except the 1-position of a straight alkyl chain of between 9 and 15 carbons (Fig: 1) (Eganhouse et al.,1983). Linear alkylbenzenes (LABs) are commonly found in the environment due to their use as a precursor in the manufacture of linear alkylbenzene sulphonate (LAS) detergents, in which they remain as trace contaminants (Cirsp et al., 1979; Eganhouse & Kaplan 1982; Ishiwatari et al., 1983). Other uses include insulating oils in buried electricity transmission cables from where they may enter sediments in the event of damage to the cable sheath or joints (Gledhill et al. 1991). Different anthropogenic activities in wide communities and cities produce considerable quantities of solid and liquid wastes, and finally discharged as domestic wastewater. As a rule, domestic wastewater carries a wide variety of pollutants to the coastal region, so that it is one of the major sources of pollutants. They are readily biodegraded under aerobic conditions but may be released into anoxic environments where they can persistent in sediments (Johnson 2003). Laboratory experiments show that LABs can be degraded under nitrate-reducing conditions, and isomeric analysis of the remaining LABs is good indicator of the degree of degradation.
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