| #P001 | operational | operational | guidance | Ammonia (Method 350.1 Applicable Range) | drinking water | unknown | 0.01 to 2.0 mg NH3-N/L | Method 350.1 is suitable for ammonia concentrations ranging from 0.01 to 2.0 mg NH3-N/L. | Semi-automated colorimetric method (phenate method) | high |
| #P002 | operational | operational | guidance | Ammonia (Method 350.1 MDL) | drinking water | unknown | 0.01 mg/L | The MDL is not stated in the method, but is identified as 0.01 mg/L by the National Environmental Methods Index. | | high |
| #P003 | operational | operational | guidance | Ammonia (Method 350.2 MDL - colorimetry) | drinking water | unknown | 0.05 mg/L | Method 350.2, which uses either colorimetry (nesslerization) or titrimetry procedures, has MDLs of 0.05 mg/L and 1.0 mg/L, respectively | Colorimetry (nesslerization) | high |
| #P004 | operational | operational | guidance | Ammonia (Method 350.2 MDL - titrimetry) | drinking water | unknown | 1.0 mg/L | Method 350.2, which uses either colorimetry (nesslerization) or titrimetry procedures, has MDLs of 0.05 mg/L and 1.0 mg/L, respectively | Titrimetry | high |
| #P005 | operational | operational | guidance | Ammonia (Method 350.3 Applicable Range) | drinking water | unknown | 0.03 to 1400 mg NH3-N/L | The method is suitable for ammonia concentrations ranging from 0.03 mg/L to 1400 mg NH3-N/L | Ion-selective electrode equipped with a hydrophobic gas-permeable membrane | high |
| #P006 | operational | operational | guidance | Ammonia (Method 350.3 MDL) | drinking water | unknown | 0.03 mg/L | has an MDL of 0.03 mg/L | Ion-selective electrode | high |
| #P007 | operational | operational | guidance | Ammonia (Method 4500-NH3 C Applicable Range) | drinking water | unknown | 5 to 100 mg NH3-N/L | The applicable range for ammonia determination using this method is from 5 to 100 mg NH3-N/L. | Titrimetric method equivalent to U.S. EPA Method 350.2 | high |
| #P008 | operational | operational | guidance | Ammonia (Method 4500-NH3 D Applicable Range) | drinking water | unknown | 0.03 to 1400 mg NH3-N/L | Method 4500-NH3 D... is applicable to the measurement of 0.03 to 1400 mg NH3-N/L. | Ammonia-selective electrode | high |
| #P009 | operational | operational | guidance | Ammonia (Method 4500-NH3 F Linear Range) | drinking water | unknown | <= 0.6 mg NH3-N/L | This method has a linear analytical response to 0.6 mg NH3-N/L. | Phenate method similar to U.S. EPA Method 350.1, measured at 640 nm | medium |
| #P010 | operational | operational | guidance | Ammonia (Method 4500-NH3 G Applicable Range) | drinking water | unknown | 0.02 to 2.00 mg NH3-N/L | Method 4500-NH3 G is applicable in the range of 0.02 to 2.00 mg NH3-N/L. | Continuous-flow automated versions of the phenate method | high |
| #P011 | operational | operational | guidance | Ammonia (Method I-2525-89 Applicable Range) | drinking water | unknown | 0.002-0.30 mg/L | Method I-2525-89 is applicable to low ionic strength water and an ammonia concentration range of 0.002-0.30 mg/L | Low ionic strength water. Colorimetric method using a rapid flow analyser, measured at 660 nm. | high |
| #P012 | operational | operational | guidance | Ammonia (Method I-2522-90 Applicable Range) | drinking water | unknown | 0.01-1.5 mg/L | whereas Method I-2522-90 applies to a concentration range of 0.01-1.5 mg/L. | Colorimetric method using a rapid flow analyser. Sulphide, bromide, nitrite, calcium or magnesium in highly alkaline waters may interfere. | high |
| #P013 | operational | operational | recommended | Method 350.2 Titrimetry Preference Threshold | drinking water | requirement | > 1.0 mg NH3-N/L/L | titrimetry procedures are preferred for ammonia concentrations greater than 1.0 mg NH3-N/L/L | U.S. EPA Method 350.2 selection criterion | high |
| #P014 | operational | operational | recommended | Method 350.2 Colorimetry Preference Threshold | drinking water | requirement | < 1.0 mg NH3-N/L/L | colorimetry procedures are preferred for concentrations below 1.0 mg NH3-N/L/L | U.S. EPA Method 350.2 selection criterion | high |
| #P015 | physical | operational | guidance | Analytical Wavelength (Method 4500-NH3 F) | drinking water | requirement | 640 nm | The intensity of the blue indophenol dye, a reaction product, is proportional to the concentration of ammonia and is measured at 640 nm using a spectrophotometer. | Standard Method 4500-NH3 F phenate method | high |
| #P016 | physical | operational | guidance | Analytical Wavelength (USGS Methods I-2522-90 and I-2525-89) | drinking water | requirement | 660 nm | form the salicylic analogue of indophenol, which is measured at 660 nm. | U.S. Geological Survey Methods I-2522-90 and I-2525-89 | high |