Lachat Method: Ammonia 10-107-06-5-B

Document ID

Document ID ME142

Published Date

Published Date 05/08/2020
Method Number
Lachat Method: Ammonia 10-107-06-5-B
Method # Range MDL Units Matrix Rev. Date
10-107-06-5-B 0.10-1.0
mg/L NH3-N Waters 19-Mar-04
The sample containing ammonium is injected into a continuous carrier stream by means of an injection valve, and is mixed with a continuously flowing stream of an alkaline solution. The ammonia is separated from the matrix in a diffusion cell over a hydrophobic semipermeable membrane and taken up by a flowing recipient stream containing a pH indicator. Due to the resulting pH shift, the indicator solution changes color, which is measured continuously at 590 nm in the flow photometer.

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