J.Junsomboon and J.Jakmunee, "Determination of Chromium(VI) in Concrete Roofing Tiles  by Differential Pulse  Cathodic Stripping Voltammetric Method” (Poster Presentation), The38th Congress on Science and Technology of Thailand (STT.38), 17 - 19 October 2012, The Empress Convention Centre Chiang Mai , Chiang Mai, Thailand.