Product Overview

• HI7072 is a 1M KNO3 electrode fill solution for use with double junction and ion selective electrodes. Before any measurement, the electrolyte level in refillable electrodes should be checked. If the level is low, refill with the appropriate electrolyte to ensure optimum performance. This simple maintenance helps guarantee sufficient head pressure to facilitate the flow of reference electrolyte into the sample being measured.

• Fill solution for double junction and ion selective electrodes

• Convenient 30 mL bottle

• Bottle marked with expiration date and lot number

• HI7072 1M KNO3 (potassium nitrate) electrode fill solution is chloride-free. It is primarily used as a reference fill solution for bromide, cadmium, chloride, copper, cyanide, iodide, lead/sulfate, and silver/sulfide electrodes. It can also be used as a replacement for the 3.5 M KCl (potassium chloride) fill solution used in double junction refillable electrodes when making pH measurements in samples containing heavy metals such as silver, lead, and mercury. These heavy metals can react with 3.5M KCl solution to form insoluble chloride salts. Any precipitation in the liquid junction will interfere with the reference potential, causing unstable readings.

• Hanna's double junction system has two junctions, only one of which is in contact with the sample, as shown in the figure below. Using a double junction electrode generally reduces the likelihood of clogging the outer junction, because the outer reference cell uses a “silver-free” fill solution to prevent the formation of precipitates that clog the junction. HI7072 electrolyte solution is also “chloride-free”, which minimizes precipitation in solutions containing heavy metals. HI7072 ensures optimum measurement performance of pH electrodes.