Ion Selective Electrode Determination of Ammonia Nitrogen in Passaic River Waste Water in New Jersey Essex County Area
- 1 Analytical Chemistry Research Department, UniChem Analysis Laboratories, Garfield, NJ, USA
- 2 Faculty of Fine Art, Florya Campus, Istanbul Aydin University, Istanbul, Turkey
- 3 Rutgers University, Public Health New Brunswick, NJ, USA
- 4 New Jersey Institute of Technology, Chemical Engineering, Newark, NJ, USA
Abstract
The percent ammonia nitrogen was determined in Passaic River waste water using Ion-Selective Electrode EPA Method 350.3. The intelligent ammonia sensor integrates ammonia electrode, pH electrode and Ammonia Ion electrode together to realize the in situ detection of ammonia. The test results have shown that the sensor is easy operation, low cost and no pollution. The ammonia is determined potentiometrically using an ammonia ion selective electrode and a pH/mV meter, having an expanded millivolt scale. The ammonia selective electrode uses a hydrophobic gas-permeable membrane to separate the sample solution from an electrode internal solution of ammonium chloride. Dissolved ammonia is converted to NH 3 gas by raising the pH to above 11.0 with a strong base. NH 3 gas diffuses the membrane and changes the internal solution pH that is sensed by the electrode. In single laboratory test results have been found 1.001 NH 3 -/L and 0.897 mg NH 3 -N/L, recoveries were 77.3% and 83.1%, respectively.
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