visocolor® Powder Pillows Nitrite
Test 7-30
Reagent for the photometric determination of Nitrite in surface, ground, and drinking water.
Measuring Range
- 0.01–0.30 mg/L NO₂-N (16 mm OD)
- 0.005–0.300 mg/L NO₂-N (24 mm OD)
- 0.03–1.00 mg/L NO₂ (16 mm OD)
- 0.015–1.000 mg/L NO₂ (24 mm OD)
Method
Photometric determination of nitrite ions via diazotation.
Hazard Warning
Information regarding safety can be found on the box' label and in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.
Procedure
Requisite accessories: 2 test tubes 16 mm OD (REF 91680) or 2 test tubes 24 mm OD (REF 936101)
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Rinse test tube several times with sample. (pH value of sample must be between pH 2 and 11)
Visual Description: Diagram 1 shows liquid being poured from one test tube into another, followed by a swirling motion.
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Blank (optional):
Fill one test tube with 5 mL of sample.
Visual Description: Diagram 2 shows a test tube being filled with 5 mL of liquid, with a beaker indicating the pH range of 2-11.
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Clean test tube.
Visual Description: Diagram 3 shows a hand holding a test tube.
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Place test tube in photometer as blank value and adjust for zero.
Visual Description: Diagram 4 shows a test tube containing liquid, marked with '0', with an arrow indicating placement into a device (photometer).
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Sample:
Add 5 mL of the sample in a further test tube.
Visual Description: Diagram 5 shows a test tube being filled with 5 mL of liquid, with a beaker indicating the pH range of 2-11.
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Add the contents of one Powder Pillow Nitrite.
Visual Description: Diagram 6 shows powder being poured from a sachet into a test tube.
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Close test tube and shake well.
Visual Description: Diagram 7 shows a test tube being shaken, indicated by vibration lines.
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Clean test tube.
Visual Description: Diagram 8 shows a hand closing a test tube with a cap.
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Wait for 20 min.
Visual Description: Diagram 9 shows a clock face with the time indicated as 20 minutes.
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Measure.
Visual Description: Diagram 10 shows a test tube containing liquid, marked with 'M', with an arrow indicating placement for measurement.
Measurement
See manual for all MACHEREY-NAGEL photometers. After use, rinse out test tubes thoroughly and seal them. Remains of Powder can be dissolved in weakly acidic media. The reagent is also suitable for the analysis of seawater.
Interferences
The temperature of the water sample should be between 20 °C and 30 °C.
Disposal of Samples
Information regarding disposal can be found in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.
