J. Junsomboon, P. Sawangsri, J. Jakmunee, “Determination of Chromium(VI) in Cement by Using a New Extraction Procedure and Differential Pulse Cathodic Stripping Voltammetric Method”, (Poster Presentation), Pure and Applied Chemistry International Conference 2014 (PACCON 2014) , 8 – 10  January  2014, Centara Hotel and Convention Centre, Khonkaen, Thailand.