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2. Standard Methods for the Examination of Water and Wastewater,2005
3. J.W. O’Dell, U.S. EPA Method 353.2, Revision 2.0, 1993, http://www.epa.gov/Region6/6lab/methods/353_2.pdf.
4. U.S. EPA Method 352.1, 1971, http://www.epa.gov/waterscience/methods/method/files/352_1.pdf.
5. J.D. Pfaff, D.P. Hautman, D.J. Munch, U.S. EPA Method 300.1 Revision 1.0, 1997, http://www.epa.gov/safewater/methods/pdfs/methods/met300.pdf.