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The transport of P sources (organic and inorganicphosphorus) using electrokinetic process through a low-permeabil-ity soil was investigated. A series of batch experiments was conductedto construct the adsorption isotherms of KH2PO4 and triethyl phos-phate (TEP) on kaolin soils. Approximately 60.3% of phosphorusfrom KH2PO4 was adsorbed within 24 hours, and the maximumadsorption (73%) was attained at 6 days after adsorption. In contrast,TEP showed no P adsorption in 7 days, thus suggesting an alter-native P source that may maintain a favorable proportion ofC:N:P through the effective delivery during in situ bioremediationin low permeability soils. Experiments using electrokinetic processwere carried out with electrokinetic reactor having a hydraulicconductivity of 1.99×107 cm s1 for a 0.01 M NaCl aqueous solution.TEP and KH2PO4 were used as organic P source and inorganic Psource, respectively, and introduced individually into a chambernear the platinum anode and near the platinum cathode, respec-tively. Potassium dihydrogen phosphate was not distributed uni-formly along the soil column and most of transported phosphoruswas changed to water-insoluble aluminum phosphate after 12 daysof treatment, indicating the decrease of bioavailability of the phos-phorus. In case of TEP, the advancing P front progressed with time,resulting in uniform P distribution through the kaolin column. Interms of transport, organic phosphorus, TEP, would be a moreeffective P source than inorganic phosphorus, KH2PO4, in electro-kinetic enhanced bioremediation.