Validating Preservation Techniques for Nitrogen Species ... - CiteSeerX
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Evaluation of Preservation Methods for Nutrient Species Collected by Automatic Samplers Patricia M. Burke, Steven Hill, Nenad Iricanin, Cynthia Douglas, Patrick Essex, and Danielle Tharin South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 33416-4680 ABSTRACT Automatic samplers are a common method of data collection for numerous monitoring projects in the South Florida region and elsewhere. Although total phosphorus (TP) is the primary parameter of interest within this region, nitrogen species such as ammonia nitrogen (NH4-N), nitrate+nitrite nitrogen (NOx-N), and total kjeldahl nitrogen (TKN) are also collected and analyzed. Federal and state quality assurance guidelines require nutrient samples to be preserved by acidification with H2SO4 to a pH
