The scope and application for this standard is for natural and treated wastewater with a quantification limit of approximately 0.3 mg/L N.
State regulatory agencies are beginning to regulate total nitrogen discharge in wastewater permits. There is no single step method or standard to determine total nitrogen. Laboratories currently have to perform a TKN and nitrate analysis, then add the two results to obtain total nitrogen. At least one state is accepting total nitrogen by persulfate digestion and colorimetric detection. A concensus-based standard is expected to be adopted the states with eventual promulgated by USEPA.
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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