1659-1321 1659-1321 S1659-13212016000100061 10.15517/am.v27i1.21878 CR CR 00 06 2016 00 06 2016 27 1 61 71

AOAC (Association of Official Analytical Chemist) 2005 18 APHA (American Public Health Association) 2004 17 1986 69 2543-50 1999 19-23 Jul. 1999 San José, Costa Rica 545-53 2010 2008 1998 9 303-12 2006 2 56-1-56-13 2009 20 297-309 2001 11 465-73 2003 13 585-91 2000 2012 21-22 nov. 2012 San Carlos, CRC 2003 2001 11 495-503 2004 43 12-7 2009 100 3734-9 2000 2010 2nd 2010 2nd 1998 81 16-24 2007 40 529-37 2006 16 1119-31 2012 2006 4 2007 2011 341-50 1990 3rd 2012 2001 2008 18 695-704 1999 9 403-4 2004 3 2006 2nd