The effect of incubation time and silk worm cocoon on mobility of zinc and copper in contaminated clay soil Journal title: Journal of Advances in Environmental Health Research (JAEHR) Authors: Bahareh Lorestani, Hajar Merrikhpour, Faezeh Daneshvari, Nasrin Kohahchi Subject(s): Environmental Sciences, Environmental Toxicology, Environmental Protection, Public, Environmental & Occupational Health, Engineering, Environmental