Nitrites can be harmful to aquatic organisms even in low concentrations and for this reason, they are closely monitored in aquariums and aquaculture facilities. In cooling towers, however, an adequate amount of nitrites is necessary to prevent corrosion. In high concentrations, they can be harmful to the environment and to humans. They are, therefore, normally monitored to verify the quality of water for domestic use, as well as lakes and ponds. Nitrites are an intermediate product in the nitrogen cycle produced by ammonia oxidation with water, or even originate in industrial waste directly.
Hanna offers a variety of chemical based methods to measure nitrite. Available technologies include Spectrophotometer, benchtop and portable photometers, Checker HC, and chemical test kits.
Below are the most common products used for measurement of nitrites.
Spectrophotometers are available that have the nitrite method in several ranges pre-programmed into the meter. The spectrophotometer offers the highest precision due to the quality of the optical system that has a wavelength accuracy of +/- 1.5 nm. The spectrophotometer allows for custom methods to be used as well.
Benchtop photometers include multiparameter versions for water treatment, wastewater treatment, environmental, and aquaculture. Each photometer is customized to have the parameters used by a specific industry. All benchtop have a digital pH electrode input allowing it to be used as a traditional pH meter.
Portable photometers are available in two ranges. The portable photometers have a CAL Check feature that allows for performance verification, and if needed, recalibration using the CAL Check standards. The portable meters are available as a meter only option or as a kit. The kit version includes a rugged carrying case and CAL Check standards.
Checker HC, like a chemical test kit, are reagent based, with a color change based on concentration. The handheld colorimeters, like portable and benchtop instrumentation, use the Beer-Lambert principle to determine the color change. The change in color is not subjective as with using the naked eye. A marine version is available with chemistry that is compatible for use with saltwater aquariums.
Chemical Test Kits
Nitrite chemical test kits are available for basic water quality testing. The Hanna Backpack Lab for Marine Science includes a nitrite test kit along with a teacher’s guide that discusses its’ importance.
Reagents for the photometers and Checker HC. The photometer reagents are available in 100 or 300 test quantities.
Solutions for nitrite measurement include the CAL Check standards for verifying and, if needed, the calibration of our portable photometers. Each CAL Check standard is supplied with a Certificate of Analysis stating the accuracy and traceability of the standard.
Accessories include the replacement cuvettes and caps for the photometers and Checker HC.