EPA Method 1690

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EPA Method 1690:
Ammonia-N in Water and Biosolids by Automated Colorimetry with Preliminary Distillation

The ammonia in the sample is first separated by distillation, eliminating many potential interferences. The ammonia released is captured in a dilute sulfuric acid solution.

This method describes procedures for the determination of ammonia-N in drinking, ground, and surface water; domestic and industrial waste; and biosolids (municipal sewage sludge). Distillation of ammonia from the sample is followed by analysis using an automated colorimetric analyzer.

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