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3. Method 410.1. Standard methods for the examination of water and wastewater 1975;APHA,1975
4. Method 405.1. Standard methods for the examination of water and wastewater 1980;APHA,1980
5. SM 4500-P-E, SM 4500-NO2-B y SM 4500- NO3-D. Standard methods for the examination of water and wastewater 1998;APHA,1998