EPA Method 1685

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EPA Method 1685:
Nitrate/Nitrite-N in Water and Biosolids by Automated Photometry

Aqueous samples are filtered then passed through a cadmium-copper reduction column prior to analysis.

This method describes procedures for the determination of nitrate/nitrite-nitrogen, or oxidized nitrogen, in drinking, ground, and surface water; domestic and industrial waste; and biosolids (treated municipal sewage sludge). Automated photometry is used to determine the nitrate/nitrite concentration of the sample.

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