Procedure guides on inside lid HI96783-25 • HI96784-25 • HI96789-25 Nitrite and Nitrite in Seawater Pre-dosed Reagent Set 13 mm Vial Hanna oers three dierent kits of predosed reagents for the analysis of Nitrite: • HI96783-25 Low Range • HI96784-25 Medium Range • HI96789-25 Low Range (Seawater) All kits have vials for 25 tests to be used with Hanna’s HI801 and HI802 spectrophotometers. These high-quality reagents are manufactured in our state-of-the-art facility and are clearly marked with lot number and expiration date for traceability. The method is compliant with ISO 26777 and assures a great accuracy (±10 µg/L for low range, ±0.10 mg/L for medium range). The procedure is simple with a representative sample volume (4 mL for low range). The use of 13 mm cuvettes (internal diameter), with a longer optical path than many other vials on the market, ensures accurate absorbance measurements and greater repeatability of results. Signicance and Use Nitrite is an intermediate oxidation state of nitrogen, both in the oxidation of ammonia to nitrate and in the reduction of nitrate. Such oxidation and reduction may occur in wastewater treatment plants, water distribution systems and natural waters. Nitrite can enter a water supply system through its use as a corrosion inhibitor in industrial process water. Nitrite changes the normal form of hemoglobin, which carries oxygen through blood to the rest of the body, into a form called methemoglobin that cannot carry oxygen. Nitrite in Seawater In waste water treatment plants, when water is analyzed, the main interferent is certainly Chlorides. Chloride values above 2000 ppm cause interference and erroneous readings with all standard Nitrite testing kits. To overcome this problem, Hanna has developed the HI96789-25 kit, which allows accurate measurements of Nitrite, even in the presence of seawater (chloride values up to 24,000 ppm). Application Wastewater, drinking water, surface water, mineral water, groundwater Method The method is an adaptation of the Standard Method for the Examination of Water and Wastewater, 23rd Edition, 4500B Diazotization Method, Nitrogen Nitrite. This method is compliant with ISO 26777 4 Reasons to Choose Hanna 1. The method follows ISO 26777 2. Maximum precision: ±10 μg/L (Low Range) and ±0.10 mg/L (Medium Range) 3. Representative sample: 4 mL (Low Range) or 0.4 mL (Medium Range) 4. HI96789-25 is for analysis in samples with chloride concentrations above 2000 ppm, up to 24000 ppm Specifications HI96783-25 HI96784-25 HI96789-25 Range 0 to 600 μg/L (as NO¯±-N) 0.00 to 6.00 mg/L (as NO¯±-N) 0 to 600 μg/L (as N0±¯-N) Resolution 1 μg/L 0.01 mg/L 1 μg/L Accuracy ±10 μg/L ± 3% of reading at 25°C , whichever is greater ±0.10 mg/L ± 3% of reading at 25°C ±15 μg/L ±5% of reading at 25 °C Wavelength 525 nm 525 nm 525 nm Cuvette Type 13 mm diameter 13 mm diameter 13 mm diameter Method Adaptation of the Standard Method for the Examination of Water and Wastewater, 23rd Edition, 4500B Diazotization Method, Nitrogen Nitrite Adaptation of the Standard Method for the Examination of Water and Wastewater, 23rd Edition, 4500B Diazotization Method, Nitrogen Nitrite Adaptation of the Standard Method for the Examination of Water and Wastewater, 23rd Edition, 4500B Diazotization Method, Nitrogen Nitrite Method ID #091 #092 #098 # of Vials 25 25 25 11 COD and Vials 11.29 www.hannainst.com | Pre-dosed Reagents
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