http://ir.lib.ruh.ac.lk/handle/iruor/18774 CHE 4252 Sun, 10 May 2026 00:39:51 GMT 2026-05-10T00:39:51Z http://ir.lib.ruh.ac.lk/handle/iruor/3965 CHE 4252 - Environmental Chemistry Department of Chemistry Fri, 01 Mar 2019 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/3965 2019-03-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/2033 CHE 4252 - Environmental Chemistry Department of Chemistry Thu, 01 Dec 2016 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/2033 2016-12-01T00:00:00Z