Nitrate-N NEDHSColorimetric Test for Nitrate 0 – 0.8 mg/L N |
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| Product Code | 654100 |
| Contents | Reagent A, 15 mL Reagent B, 2 g Test tube, 5 mL (2x) Measuring spoon Colour Comparator Instructions for Use |
| Analytical Method | Reduction to nitrite, diazotation / azocoupling: In acid conditions, nitrate is reduced to nitrite by metallic zinc. Then nitrite forms a diazo-compound with sulfanilamide. This diazo-compound reacts with N-(1-naphthyl)-ethylenediamine forming an intensely coloured pink azo dye, the intensity of which is related to the nitrite concentration. |
| Number of Tests | 70 |
| Interferences | Water constituents at concentrations commonly found in natural waters will not cause interferences. Oxidants like chlorine and ozone will interfere, causing low results. Nitrite will interfere seriously (same reaction). Seawater: Seawater and waters high in salinity will cause low results. In order to compensate for that, multiply reading by 1.5. |
| Measuring Range | The standard measuring range is 0 – 0.8 mg/L nitrate-nitrogen. The colour comparator has 5 colour fields: 0.05–0.1–0.2–0.4–0.8 mg/L. For higher nitrate concentrations, the sample has to be diluted. A 1:4 sample dilution can be carried out easily, thus extending the measuring range to 18 mg/L. |
| Shelf Life | 2 years |
| Applications | Determination and monitoring of nitrogen levels in natural waters (environmental monitoring), waste water. |