Efektivitas EDTA (Ethylenediaminetetracetic Acid) dalam Meningkatkan Akumulasi Timbal pada Saccharum spontaneum yang 'Ihmbuh di Limbah Penambangan Emas

ABSTRACT Effectivity of EDTA (EthylenediaminetetraceticAcid) in Increasing Lead Accumulation of Saccharum spontaneum Grown Under Gold Mine Waste. Lead (Pb) is known as one of a major metal contaminant in mine tailing. This metal has low solubility, and in many cases, is not readily available. In most soils capable of supporting plant grow, the soluble Pb2+ levels are relatively low and will not promote substantial uptake by the plant. In addition, many plants retain Pb2+ in their roots with only minimal trabsport to the aboveground plant portions. Therefore, it is important to find ways to enhance the bioavailability of Pb2+ or to find specific plants that can better translocate the Pb2+ into harvestable portions for phytoremediation. The success of Pb phytoremediation is to have significant Pb availability as well as a large quantity of plant biomass with high rate of growth. This experiment was conducted to obtain both purposes. Saccharum spontaneum which proven tolerant and dominant in contaminated area as well as potential in producing high biomass was used in this research.The plants were grown in waste media added by 100 ppm, 200 ppm and 300 ppm of Pb. Ethylenediaminetetracetine Acid (EDTA) was applied to increase Pb availability and plant uptake as well as translocation to the aboveground portions. The results showed that the plant still capable of growing under the highest level of Pb. EDTA increase Pb availability and plant uptake. Pb accumulation in the aboveground biomass of EDTA treated plants were relatively higher than untreated plants. Key words: Timbal, EDTA, phytoremediation