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Nitrate |
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Methods
Nitrate is the most completely oxidized form of nitrogen. It is formed during the final stages of biological decomposition, either in wastewater treatment facilities or in natural water supplies. Low-level nitrate concentrations may be present in natural waters. However, a Maximum Contaminant Level of 10 ppm nitrate-nitrogen has been established for drinking water by the USEPA.
The Cadmium Reduction Method
References: ASTM D 3867-99, Nitrate-Nitrite in Water, Test Method B. APHA Standard Methods, 20th ed., pp. 4-117, Method 4500-NO3 - E (1998). USEPA Methods for Chemical Analysis of Water and Wastes, Method 353.3(1983).
Nitrate is reduced to nitrite using cadmium as the reducing agent. The resulting nitrite concentration is then determined colorimetrically. This method is applicable to drinking and surface waters, as well as domestic and industrial wastes. Nitrite will interfere with this test. Results are expressed as ppm (mg/L) NO3-N or NO3.
The Zinc Reduction Method, NEW!
References: ASTM D 3867-99, Nitrate-Nitrite in Water, Test Method B. APHA Standard Methods, 20th ed., pp. 4-117, Method 4500-NO3 - E (1998). USEPA Methods for Chemical Analysis of Water and Wastes, Method 353.3 (1983). Nelson, J. L., Kurtz, L. T., and R. H. Bray, Rapid Determination of Nitrates and Nitrites. Anal. Chem., V26, p. 1081-1082, (1954).
Nitrate is reduced to nitrite using zinc as the reducing agent. The resulting nitrate concentration is then determined colorimetrically. This method is applicable to industrial wastewaters, drinking, and surface waters. These test kits can also be used for the analysis of seawater. This method will measure nitrate in the presence of low levels of nitrite (by difference). Results are expressed as ppm (mg/L) NO3-N.
The test kits that employ this method include sample tubes that are pre-dosed with zinc reagent, so the awkward use of foil packs is eliminated. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-3 ppm as N
0.25 ppm / Method: Cadmium Reduction/Azo dye formation |
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Cat# |
| CHEMets Kit |
K-6904 |
| | CHEMets Refill, 30 ampoules and 30 cadmium foil packs | R-6902 |
| | Comparator, Shelf-life 12 Months:
0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2.0, 3.0 ppm | C-6904 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, 25 mL sample cup, sample cup top, instructions, and MSDS. | |
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0-90 ppm
7.5 ppm / Method: Cadmium Reduction/Azo dye formation |
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Cat# |
| VACUettes Kit |
K-6904D |
| | VACUettes Refill, 30 ampoules and 30 cadmium foil packs | R-6902D |
| | Comparator, Shelf-life 12 months:
0, 7.5, 15, 22.5, 30, 37.5, 45, 60, 90 ppm | C-6904D |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Comparator, dilutor snapper cup, 5 mL sample cup with top, instructions, and MSDS. | |
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0-180 ppm
15 ppm / Method: Cadmium Reduction/Azo dye formation |
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Cat# |
| VACUettes Kit |
K-6904A |
| | VACUettes Refill, 30 ampoules and 30 cadmium foil packs | R-6902A |
| | Comparator, Shelf-life 12 months:
0, 15, 30, 45, 60, 75, 90, 120, 180 ppm | C-6904A |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Comparator, dilutor snapper cup, 5 mL sample cup with top, instructions, and MSDS. | |
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0 - 360 ppm
30 ppm / Method: Cadmium reduction/Azo dye formation |
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Cat# |
| VACUettes Kit |
K-6904B |
| | VACUettes Refill, 30 ampoules and 30 cadmium foil packs | R-6902B |
| | Comparator, Shelf-life 12 months:
0, 30, 60, 90, 120, 150, 180, 240, 360 ppm | C-6904B |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Comparator, dilutor snapper cup, 5 mL sample cup with top, instructions, and MSDS. | |
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 Instrumental Kits |
0.20-1.50 ppm as N
Cadmium Reduction |
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Cat# |
| Vacu-vials Kit |
K-6903 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, thirty cadmium foil packs, 25 mL sample cup, sample cup top, ampoule blank, instructions, calibration table, and MSDS. | |
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0.20-3.00 ppm as N
Cadmium Reduction |
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Cat# |
| Vacu-vials Kit |
K-6923 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, thirty cadmium foil packs, 25 mL sample cup, sample cup top, ampoule blank, instructions, calibration table, and MSDS. | |
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10-60 ppm as NO3
Cadmium Reduction |
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Cat# |
| Vacu-vials Kit |
K-6933 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests (except distilled water): thirty ampoules, thirty cadmium foil packs, 25 mL sample cup, sample cup top, 3.0 mL syringe, ampoule blank, instructions, calibration table, and MSDS. | |
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Kit Components common to Nitrate |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Sample Cup Top Pack for 25 mL Cup (6 ea) | A-0014 |
| | Dilutor Snapper Cup Pack (6 ea) | A-0018 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
| | Syringe Pack, 3.0 mL (6 ea) | A-0063 |
| | Sample Cup & Top Pack, 5 mL (6 ea) | A-0105 |
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