Malays. Appl. Biol. (2005) 34(2): 25–30
UPTAKE OF TIN BY CYPERUS ROTUNDUS L. IN POT EXPERIMENTS
MUSHRIFAH, I.*, RAZIF, A., KHAIRIAH, J., TAN, K.H. and OOI, C.C.
School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,
43600 UKM, Bangi, Selangor, Malaysia
*
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ABSTRACT
Cyperus rotundus was planted in pots to determine tin (Sn) uptake and its biological absorption coefficient (BAC) values. The plants were exposed to varying Sn concentrations of 100ppm, 200ppm and 300ppm each for 2 and 4 weeks. The soil pH during the experiment remains unchanged at 6.3. The percentage of soil particle less than 63?m was about 23% while its organic content was about 2%. By sequential extraction analysis, Sn was found to chelate to fractions described as the ‘Easily and Freely Leached and Exchangeable (EFLE)’ fraction and ‘Organic oxidation (OO)’ fractions. Despite the increasing exposure to Sn, chelation of Sn to the soil fractions decreased. This noticeable decrease in Sn concentrations in soil was seen as uptake by Cyperus rotundus. The uptake of Sn by the in plant followed a reverse trend as compared to soil. Roots were the highest site of Sn accumulation in the plant, followed by the leaves, stems and the fruit. Although the BAC value for Cyperus rotundus indicated an intermediate absorption, the plant was able to strive in the presence of high Sn concentrations, normally not found in most plants.
ABSTRAK
Cyperus rotundus ditanam dalam pasu bagi menentukan pengambilan stanum (Sn) dan nilai pekali resapan biologi (BAC). Tumbuhan telah didedahkan kepada beberapa kepekatan Sn selama 2 dan 4 minggu ia itu pada kepekatan 100ppm, 200ppm dan 300ppm. Sepanjang ujian ini dijalankan didapati pH tanih kekal pada 6.3. Peratus partikel tanih yang kurang daripada 63?m adalah sebanyak 23%, manakala kandungan organik adalah sebanyak 2%. Melalui analisis eksraksi bersekuen, Sn didapati menunjukkan kepekatan yang tinggi dalam fraksi tukar ganti ion dan mudah luluhlarut (EFLE) dan oksidasi organik (OO). Walaupun dedahan kepekatan Sn kepada tanih meningkat, di dapati kehadirannya dalam tanih menurun. Penurunan ini berlaku mungkin disebabkan oleh pengambilan Sn oleh Cyperus rotundus. Corak pengambilan Sn oleh tumbuhan didapati songsang berbanding dengan tanih. Bahagian akar merupakan tapak tumpukan Sn dalam tumbuhan, diikuti dengan daun, batang dan buah. Walaupun nilai BAC Cyperus rotundus menunjukkan resapan yang perantaraan, tumbuhan ini boleh hidup dalam keadaan tanih yang mempunyai Sn yang tinggi, yang tidak selalu terdapat pada tumbuhan lain.
Key words: Cyperus rotundus L., Sn, hyperaccumulator plant, sequential extraction, tin tailing area.
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