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• W2552034105 abstract "Environmental monitoring has become a very important tool in environmental management. However, it is very frequent that some important data on the initial status or conditions of a particular area is not available. This obstructs efforts to rehabilitate a disturbed area or to determine the changes that have taken place over a specific period of development. Biological sampling has been widely practiced by biologists over centuries and it is more likely to find preserved biological specimen of a particular area in museums and laboratories. This paper is to explore the possibility of using the preserved biological specimen to determine/estimate the historical environmental status of the area. The research was conducted using freshwater molluscs collected from Bau District in Sarawak. The samples collected at each site were divided into two portions, one would be analysed for heavy metals immediately while the other portion was preserved in methanol for 6 months before the chemical analysis. The results showed that the metals contents in the tissue of the molluscs differ significantly between the fresh and preserved specimen. However, the contents of metals in the shell of the animals did not indicate any significant variation. The variation of metal contents in the tissues may be related to the solubilisation of fatty tissues by methanol thus causing the metal content to increase per unit weight of the dried tissue. This paper concludes that there is a possibility of using preserved samples for biomonitoring of the earlier environment, however much work on the validation and this approach need to be done. Abstrak: Pemantauan alam sekitar kini merupakan aktiviti pengurusan alam sekitar yang penting. Seringkali keadaan asal sesuatu kawasan yang ingin dikaji tidak dapat diperolehi. Kekurangan pengetahuan keadaan asal sesuatu tempat merumitkan usahan pemulihan kawasan tersebut. Pengumpulan sample-sampel biologi telah lama dilakukan dan ini mungkin menjadi satu punca data yang boleh diterokai. Kertas kerja ini bertujuan meneroka kesesuaian penggunaan sample-sampel biologi terawit bagi menentukan keadaan semulajadi sesuatu kawasan. Kajian dijalankan mengguna sample siput dari Bau, Sarawak. Sampel-sampel siput dikutip dan dibahagi kepada dua bahagian, satunya dianalisis kandungan logam berat dengan serta merta dan satu lagi bahagian diawit di dalam methanol untuk 6 bulan sebelum dianalisis. Keputusan kajian menunjukkan terdapat perbezaan ketara di antara kandungan logam berat di dalam tisu siput yang diawit dan yang segar. Tiada perbezaan signifikan di antara cengkeran yang diawit dan yang segar. Perubahan kandungan logan berat di dalam tisu berkemungkinan disebabkan oleh penglarutan tisu-tisu lemak kedalam methanol dan ini menghasilkan peningkatan kandungan logam berat di dalam tisu siput yang diawit. Kajian ini membuat kesimpulan bahawa penggunaan sampel biologi terawit dalam pemantauan alam sekitar adalah menggalakan. Mamun demikian kajian lanjutan harus diteruskan bagi menjamin kesahihan teknik ini." @default.
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• W2552034105 date "2001-01-01" @default.
• W2552034105 modified "2023-09-23" @default.
• W2552034105 title "Environmental Biomonitoring: The Possibility of Using Preserved Biological Specimen" @default.
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