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Ammonia |
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 Methods
Low-level ammonia nitrogen may be naturally present in water as a result of the biological decay of plant and animal matter. Higher concentrations in surface waters can indicate contamination from waste treatment facilities, raw sewage, industrial effluents (particularly from petroleum refineries), or fertilizer runoff. Excessive ammonia concentrations are toxic to aquatic life.
The Direct Nesslerization Method
Reference: ASTM D 1426-03, Ammonia Nitrogen in Water, Test Method A. APHA Standard Methods, 18th ed., Method 4500-NH3 C (1992).
The test kits employing the well-established Nessler reagent to determine ammonia concentrations are applicable to drinking water, clean surface water, goodquality nitrified wastewater effluent, and seawater. In some waters, calcium and magnesium concentrations can cause cloudiness of the reagent. Adding a few drops of stabilizer solution (Rochelle Salt) will prevent this cloudiness. References recommend distilling samples prior to analysis. Results are expressed as ppm (mg/L) ammonia-nitrogen, NH3-N.
Shelf-life: although the Nessler reagent is stable, its high alkali content attacks the glass ampoule. The resulting precipitate interferes with color comparison. We recommend stocking quantities of CHEMets and VACUettes ampoules that will be used within five months. A two-month supply of Vacu-vials ampoules is suggested. Refrigeration will dramatically extend the
shelf-life of these products.
* Contains mercury. Dispose according to local, state or federal laws.
The Salicylate Method
References: Krom, Michael D., Spectrophotometric Determination of Ammonia: A Study of a Modified Berthelot Reduction Using Salicylate and Dichloroisocyanurate, The Analyst, V105, pp. 305-316, 1980.
In the ammonia test method that employs the Salicylate chemistry, free ammonia reacts with hypochlorite to form monochloramine. Monochloramine reacts with salicylate, in the presence of sodium nitro-ferricyanide, to form 5-aminosalicylate, a green-coloured complex. This test method measures free ammonia and monochloramine. Results are expressed in ppm (mg/L) ammonia-
nitrogen, NH3-N.
The Salicylate Method offers similar sensitivity to the Nesslerisation Method and there is no generation of mercury-containing waste.
Note
(1) The accessory pack supplies enough solution to perform at least 200 tests. A-1501 accessory pack supplies enough solution to analyse approximately 100 seawater samples.
(2) This shelf-life can be extended by 18 months if the ampoules are stored in the refrigerator when not in use.
*Contains mercury. Dispose according to local, state or federal laws.
If no shelf-life is listed for a product, then the shelf-life is at least 2 years.
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-2 & 0-20 ppm
0.125 ppm / Method: Salicylate |
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Cat# |
| CHEMets Kit |
K-1410 |
| | CHEMets Refill, 30 ampoules | R-1401 |
| | Activator Solution Pack, six 20 mL bottles, Shelf-life 8 months | A-1400 (1) |
| | Catalyser Solution Pack, six 20 mL bottles | A-1401 (1) |
| | Stabiliser Solution Pack, six 20mL bottles | A-1402 |
| | Comparator, Shelf-life 2 years:
0, 0.25, 0.50, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0 ppm | C-1402 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Comparator, Activator Solution, Catalyser Solution, Stabiliser solution, 25 ml sample cup, 3.0 mL syringe, instructions, and MSDS. | |
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0-1 & 1-10 ppm
0.05 ppm / Method: Direct Nesslerisation |
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Cat# |
| CHEMets Kit |
*K-1510 |
| | CHEMets Refill, 30 ampoules, Shelf-life 5 months | *R-1501 (2) |
| | Stabilizer Solution Pack, six 10 mL bottles | A-1500 (1) |
| | Stabilizer Solution Pack, six 20 mL bottles | A-1501 (1) |
| | Low Range Comparator:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm | C-1501 |
| | High Range Comparator:
1, 2, 3, 4, 5, 6, 7, 8, 10 ppm | C-1510 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Stabiliser Solutions, 25 ml sample cup, 1.0 mL syringe, instructions, and MSDS. | |
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0-30 & 30-300 ppm
5 ppm / Method: Direct Nesslerisation |
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Cat# |
| VACUettes Kit |
*K-1510D |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | *R-1501D (2) |
| | Low Range Comparator:
0, 5, 7.5, 10, 15, 20, 25, 30 ppm | C-1501D |
| | High Range Comparator:
30, 60, 90, 120, 150, 175, 200, 250, 300 ppm | C-1510D |
| | Kit comes in a plastic case and contains everything needed to perform
30 tests (except distilled water): Refill, Low and High Range Comparators,
dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-60 & 60-600 ppm
10 ppm / Method: Direct Nesslerisation |
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Cat# |
| VACUettes Kit |
*K-1510A |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | *R-1501A (2) |
| | Low Range Comparator:
0, 10, 15, 20, 30, 40, 50, 60 ppm | C-1501A |
| | High Range Comparator:
60, 120, 180, 240, 300, 350, 400, 500, 600 ppm | C-1510A |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-120 & 120-1200 ppm
20 ppm / Method: Direct Nesslerisation |
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Cat# |
| VACUettes Kit |
*K-1510B |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | *R-1501B (2) |
| | Low Range Comparator:
0, 20, 30, 40, 60, 80, 100, 120 ppm | C-1501B |
| | High Range Comparator:
120, 240, 360, 480, 600, 700, 800, 1000, 1200 ppm | C-1510B |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-1000 & 1000-10,000 ppm
100 ppm / Method: Direct Nesslerization |
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Cat# |
| VACUettes Kit |
*K-1510C |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | *R-1501C (2) |
| | Low Range Comparator:
0, 100, 200, 300, 400, 600, 800, 1000 ppm | C-1501C |
| | High Range Comparator:
1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 10,000 ppm | C-1510C |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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 Instrumental Kits |
0.20-3.00 & 2.0-30 ppm
Salicylate |
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Cat# |
| Vacu-vials Kit, Shelf-life 8 months |
K-1403 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Activator Solution, Catalyser Solution, 25 mL sample cup, ampoule blank, instructions, calibration table, and MSDS. | |
| | Vacu-vials Kits require the use of the V-2000 Photometer or a spectrophotometer capable of accepting a 13mm diameter round cell. Instrument sold separately. | |
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0.70-7.00 ppm
Direct Nesslerisation |
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Cat# |
| Vacu-vials Kit, Shelf-life 2 months |
*K-1503 (2) |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Stabilizer Solutions, 25 ml sample cup, ampoule blank, 1.0 mL syringe, instructions, calibration table, and MSDS. | |
| | Vacu-vials Kits require the use of the V-2000 Photometer or a spectrophotometer capable of accepting a 13mm diameter round cell. Instrument sold separately. | |
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1.0-14.0 ppm
Direct Nesslerisation |
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Cat# |
| Vacu-vials Kit, Shelf-life 2 months |
*K-1523 (2) |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Stabilizer Solutions, 25 mL sample cup, ampoule blank, 1.0 mL syringe, instructions, calibration table, and MSDS. | |
| | Vacu-vials Kits require the use of the V-2000 Photometer or a spectrophotometer capable of accepting a 13mm diameter round cell. Instrument sold separately. | |
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Kit Components common to Ammonia |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Micro Test Tube Pack (10 ea) | A-0015 |
| | Dilutor Snapper Cup Pack (6 ea) | A-0018 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
| | Syringe Pack, 1.0 mL (6 ea) | A-0027 |
| | Syringe Pack, 3.0 mL (6 ea) | A-0063 |
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