Study on plant uptake of heavy metal in solid waste after stabilization
1998
Waraporn Som-aum, Mahidol Univ., Bangkok (Thailand). Faculty of Science. Dept. of Chemistry
Total concentration of elements alone does not indicate metal uptake from soil or contaminated soil by plants. Bioavailability in natural condition of a metal depends upon its potential mobility resulting from the difference in chemical forms. The metal mobility can be reduced by metal stabilization using some adsorbents. In this report, zeolite and dried water-hyacinth were selected as adsorbents to stabilize some toxic heavy metals in a sample of solid waste from a metal refinery. Various percentage of adsorbents in solid waste were prepared for pot experiments in short term study. The rapid growing plants, Black gram and Chinese watergreen, were grown and analyzed for their metal uptake study to confirm the stabilization effect. The bioavailabilities of cadmium, copper, lead, manganese and zinc in treated solid waste were studied by chemical sequential extraction. The concentration in two extractants presently desinated exchangeable and acid soluble forms are usually considered as bioavailable. Shoots and roots of plants were analysed for metal content by acid digestion. The concentration of all metals were detected by Electrothermal Atomic Absorption Spectrometry (ETAAS). The results showed that after stabilization, bioavailabilities of all metals decreased for both zeolite and dried water-hyacinth treated solid waste. The plant uptake of each metal showed very close relationship with its metal bioavailability.
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