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Hanna Instruments Canada
Customer Support: (800) 842-6629

HI7072 Electrolyte Fill Solution, 1M KNO₃ (30 mL x 4)


In stock

HI7072 is a 1M KNO3 electrode fill solution for use in double junction and ion selective electrodes. The electrolyte level in refillable electrodes should be checked before performing any measurements. If the level is low, refill with the proper electrolyte solution to ensure optimum performance. This simple maintenance helps guarantee adequate head pressure to promote the flow of reference electrolyte into the sample being measured.

  • Fill solution for double junction and ion selective electrodes
  • Convenient 30 mL bottles
  • Clearly marked bottle with expiration date and lot number


The HI7072 1M KNO3 (potassium nitrate) electrode fill solution is chloride free. It is mainly used as a reference fill solution for Bromide, Cadmium, Chloride, Cupric, Cyanide, Iodide, Lead/Sulfate, and Silver/Sulfide electrodes. It can also be used as an alternative to 3.5 M KCl (potassium chloride) fill solution used in double junction refillable electrodes when taking pH measurement of samples that have heavy metals such as silver, lead and mercury. These heavy metals can react with the 3.5M KCl solution to form insoluble chloride salts. Any precipitation in the the liquid junction will interfere with the reference potential resulting in erratic 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. The likelihood of clogging the outer junction is ordinarily reduced with a double junction electrode since the outer reference cell uses a fill solution that is “silver-free” to prevent precipitate from forming that will clog the junction. The HI7072 electrolyte solution is also “chloride-free” which minimizes precipitation from solutions containing heavy metals. The HI7072 ensures optimum measurement performance from your pH electrode.


Additional information

Weight 0.2 kg



SKU HI7072
Name HI7072 Electrolyte Fill Solution, 1M KNO₃ (30 mL x 4)
Description electrolyte solution, 1M KNO₃
Certificate of Analysis no
Package bottle
Quantity 4
Size 30 mL


HI7072 Electrolyte Fill Solution, 1M KNO₃ (30 mL x 4)