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What method should I use for ammonia testing?
First, always check with your local reporting agency to see what their requirements are and what test method they recommend. That said, we recommend using an ammonia ISE electrode when testing for reporting purposes. The ammonia ISE method is less susceptible to interferences than the traditional Nesslerization method, there is no pre-distillation step, and you don’t have to worry about disposing of mercury-containing Nessler reagents.
For quick checks or simple process monitoring, using a test kit or handheld colorimeter that utilizes the Nesslerization or salicylate methods without a pre-distillation step may be more convenient than using an ammonia ISE. The test kits and colorimeter won’t be as accurate as an ISE, but it may serve your purposes.
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