individual publications academic article Phytotoxic Effects of Cu and Zn on Soybeans Grown in Field-aged Soils: Their Additive and Interactive Actions. Journal of Environmental Quality. 38:2253-2259. 2009 Aging effects on partitioning coefficients of Cd, Cu and Zn in metal-spiked soils. Journal of Korean Society of Soil and Ground water Environment. 13:47-56. 2008 Urease activity in aged copper and zinc-spiked soils: relationship to CaCl2 –extractable metals and Cu2+ activity. Environmental Toxicology and Chemistry. 27:2469-2475. 2008