%0 Conference Proceedings %T highly selective and efficient transport of lead (II) cations in natular water using a liquid membrane system with dicyclohexano-18-crown-6 as carrier. %A Mohammadzadekakhki, Roya %A Ronaghi, Gholam Hossein %J پانزدهمین کنگره شیمی ایران دانشگاه بوعلی - همدان %D 2011