EPA Method 1688

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EPA Method 1688:
Total Kjeldahl Nitrogen in Water and Biosolids by Automated Colorimetry with Preliminary Semi-automatic Digestion

The kjeldahl nitrogen in the sample is first converted to ammonia by metal-catalyzed acid digestion using a block heater/digester unit. The resulting ammonia is then separated from the sample by distillation. A procedure is given for removal of the ammonia present in the sample prior to digestion. A sample so treated then gives a result of organic nitrogen after digestion/distillation.

This method describes procedures for the determination of total kjeldahl nitrogen (TKN) and/or organic nitrogen in drinking, ground, and surface water; domestic and industrial waste; and biosolids (municipal sewage sludge). Automatic digestion of the sample is followed by analysis using automated colorimetry.

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