Khowhit, S. ., K. . Chunkao, W. . Inkapatanakul, O. . Phewnil, and A. . Boutson. “The Study of the Concentration of Heavy Metals (As, Cd, Cr, Hg, Ni and Pb) in the Sediment of Coastal Area Receiving Effluent from Phetchaburi Municipal Wastewater Treatment System: The Royally LERD Project, Phetchaburi Province”. Thai Journal of Toxicology, vol. 28, no. 2, June 2020, p. 27,