Zinc is widely used in alloys (brass, bronze, and dye-casting alloys), in galvanizing iron and other metals, also as a fungicide. It is also an essential growth element in human diet. But with concentrations higher than 5 mg/L, it gives a bitter taste to water and opalescence to alkaline water. Zinc can enter the domestic water supply from the deterioration of galvanized iron and dezincification of brass. In addition to drinking water, zinc is measured in surface finishing, boilers and cooling towers, water conditioning, and effluent waters.
Hanna offers a photometric method for measuring zinc. The method is an adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, zinc method. When the reagent is added to a sample containing zinc, the sample will turn a brown-green to a blue hue; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law.
Below are the most common products used for measurement of zinc.
Spectrophotometers are available that have a zinc method 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 environmental, water treatment, water conditioning, and wastewater treatment. 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.
A portable photometer is available to measure zinc. The portable photometers have a CAL Check feature that allows for performance verification, and if needed, recalibration using the CAL Check standards. The meters are available as a meter only option or as a kit. The kit version include a rugged carrying case and CAL Check standards.
In this category are the reagents for the portable photometer, benchtop photometers, and the spectrophtometer.
Solutions for zinc 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.