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A rapid,highly sensitive technique for the determination of ammonia in seawater
Authors:S W Willason  K S Johnson
Institution:(1) Marine Science Institute, University of California at Santa Barbara, 93106 Santa Barbara, California, USA
Abstract:A reliable and sensitive technique for the rapid determination of ammonia in seawater is described. The procedure is based on the conversion of NH 4 + in seawater to NH3 and the subsequent diffusion of NH3 across a hydrophobic membrane using flow-injection analysis. Sixty determinations can be made per hour on a flowing stream of seawater or discrete samples. The lower limit of detection is 0.05 mgrM. Results of two applications that demonstrate the potential of this technique are presented, a laboratory excretion experiment employing the crabPachygrapsus crassipes, and small-scale vertical mapping of ammonia in the ocean.
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