VISOCOLOR® HE Nitrite
Principle:
High sensitivity colorimetry with comparator block and colour comparison disc
• visual evaluation
• environment-friendly, without toxic reagents
• economically priced
• convenient handling
• highest accuracy due to extremely narrow gradation
• highest sensitivity down to 0.002 mg/l due to longer
• measuring tubes
• reagent bottles with clear dosing instructions
• compensation of turbidities and colours
• refill packs available
Colorimetric determination of nitrite
In acidic solution sulphanilic acid or sulphanilamide are diazotised with nitrite. The diazonium salt is then coupled with an aromatic amine, forming an intensely coloured azo dye. Organic colloids, chlorine, humic acids and coloured heavy metal ions interfere.(Reaction principle analogous to APHA 4500-NO2–B, EPA 35.1, DIN EN 26777-D10)
| Data and ordering information | |
| Cat. No. | 920 063 |
| Type | high sensitive test kit |
| Range | 0.0 · 0.005 · 0.010 · 0.015 · 0.02 · 0.03 · 0.04 · 0.06 · 0.08 · 0.10 mg/l NO2– |
| Sufficient for | 150 determinations |
| Shelf life | at least 24 months |
| Sea water suitability | yes |
| Detectable with PF-11 | no |
In surface waters nitrite ions are generally present in low concentrations. Their presence in ground water is less common. In waste waters nitrite frequently occurs, even in fairly high concentrations.
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