J.Junsomboon and J.Jakmunee, “Determination of potassium sodium and total alkaline in portland cement, fly ash, admixtures and water for concrete by a simple flow injection flame photometric system” (Poster Presentation), The 16th International Conference on Flow injection Analysis, Including Related Techniques (ICFIA) 2010, 25 – 30 April 2010, Pattaya, Thailand.