1. Introduction
2. American Public Health Association (APHA) . 1995 . Standard methods for the examination of water and wastewater . Method 3110. 19th ed . Washington, DC : APHA .
3. Andreadakis A , Gavalaki E , Mamais D , Tzimas A 2003 . Wastewater reuse criteria in Greece . 7th Conference on environmental science and technology; 3–6 September, Ermoupolis, Syros Island, Greece . Global Nest: Int J. 1 : 9 – 14 .
4. AOAC . 1996 . Official methods of analysis of AOAC International 46th ed . Gaithersburg, MA : Publication International .
5. Arnon, J. 1975.Mineral nutrition of maize, 210–241. Bern-Worblaufers, Switzerland: International Potash Institute.