What is nitrite measured for?

Nitrite (NO₂-) is an intermediate product of biological nitrogen conversion and an indicator of fresh impurities in water. The drinking water limit value is 0.5 mg/l NO₂- (Drinking Water Ordinance), and 0.1 mg/l at the waterworks outlet.

Nitrite is harmful to health as it impairs the blood’s ability to transport oxygen (methaemoglobinaemia). It poses a particular risk to infants and small children. In new pipes, nitrite can temporarily reach elevated levels due to bacterial activity.

Nitrite is the most dangerous nitrogen parameter in aquariums and must be checked regularly. In sewage treatment plants, nitrite control is used to monitor nitrification.

How does the test set work?

The CALDUR® Nitrite Test Set – Photometric is based on the NED method (naphthylethylenediamine). After adding a reagent to the water sample, a pink coloration develops within 5 minutes, the concentration of which is precisely determined with the WINLAB Data Line photometer.

Advantages of the CALDUR® test set

• Sensitive measuring range 0.02 – 1.0 mg/l NO₂-

  Detects contamination far below the drinking water limit

• 200 determinations per set

  Cost-efficient for continuous use

• High precision due to photometric evaluation

  Objective, reproducible measurement results with the WINLAB Data Line

• Proven NED method

  Highly selective for nitrite

Der Beitrag CALDUR® Nitrite – Photometric erschien zuerst auf RLS Wacon analytics.

What is nitrite measured for?

Nitrite (NO₂-) is formed as an intermediate product during the bacterial oxidation of ammonium to nitrate (nitrification). It is an important indicator of water quality, as its presence indicates incomplete biological treatment or fresh contamination. The limit value for drinking water is 0.5 mg/l NO₂- (Drinking Water Ordinance).

Nitrite is harmful to health as it can affect the oxygen supply in the blood (methaemoglobinaemia). A low nitrite concentration is particularly important for infants.

Nitrite is one of the most critical parameters in aquaristics, as even low concentrations are toxic to fish. In fish farming recirculation systems, seamless monitoring is essential.

How does the test set work?

The CALDUR® Nitrite LR Test Set – Colorimetric is based on the NED method (N-(1-naphthyl)-ethylenediamine). After adding a reagent to the water sample, a pink to violet coloration develops within 5 minutes, the intensity of which is proportional to the nitrite concentration.

The measured value is determined by direct color comparison with a supplied color chart.

Advantages of the CALDUR® test set

• Sensitive measuring range 0.05 – 1 mg/l NO₂-

  Detects concentrations well below the drinking water limit value

• 200 determinations per set

  Particularly economical for regular checks

• Quick analysis in just 5 minutes

  Results directly on site

• Only 1 reagent required

  Particularly easy handling

• Robust plastic housing with hinged lid

  Safe transportation and protection of reagents

Der Beitrag CALDUR® Nitrite LR – Colorimetric erschien zuerst auf RLS Wacon analytics.

What are nitrate and nitrite measured for?

Nitrate (NO₃⁻) and nitrite (NO₂⁻) are important nitrogen compounds in water analysis. The limit value for nitrate in drinking water is 50 mg/l, for nitrite 0.5 mg/l (German Drinking Water Ordinance). Both parameters must be monitored regularly.

Nitrate enters groundwater and surface water mainly through agricultural fertilisation and wastewater. Elevated nitrate concentrations can be harmful to infants (methaemoglobinaemia) and indicate contamination of the water catchment area.

Nitrite is formed as an intermediate product in the bacterial conversion of ammonium to nitrate (nitrification) and is more toxic than nitrate. In drinking water pipes, nitrite can form due to stagnation and bacterial activity.

The MN nitrate/nitrite test strips determine both parameters simultaneously in a single measurement – ideal for a quick orientation test.

How do the test strips work?

The test strips have two separate reaction zones: one for nitrate and one for nitrite. Both zones change colour when dipped into the sample according to the respective concentration. By comparing the colour with the printed scale, both values are read off simultaneously.

Nitrate reading: Colour scale with steps 0 / 10 / 25 / 50 / 100 / 250 / 500 mg/l NO₃⁻.
Nitrite reading: Colour scale with steps 0 / 1 / 5 / 10 / 20 / 40 / 80 mg/l NO₂⁻.

Benefits of the MN test strips

• Determine two parameters at once

  Nitrate AND nitrite in a single measurement – time-saving and practical

• Quick measurement in about 1 minute

  Immediate results without reagents or instruments

• 100 determinations per tin

  Particularly economical for regular checks

• Wide measuring range

  Nitrate 0-500 mg/l, nitrite 0-80 mg/l – covers all practically relevant ranges

• No reagents required

  No mixing, no drops, no waste

Der Beitrag MN nitrate/nitrite test strips erschien zuerst auf RLS Wacon analytics.