Instruction Manual
Potassium Electrode
3
EUTECH INSTRUMENTS PTE LTD
.
POTASSIUM ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Instruments Potassium Ion Electrode is used to measure potassium ions in aqueous solutions
quickly, simply, accurately, and economically.
Required Equipment
1.
A pH/mV meter or an ion meter, either line operated or portable.
2.
Semi-logarithmic 4-cycle graph paper for preparing calibration curves when using the
meter in the mV mode.
3.
A magnetic stirrer.
4.
Eutech Potassium Ion Combination Epoxy-body Electrode, Code no. EC-K-03.
Required Solutions
1.
Deionized or distilled water for solution and standard preparation.
2.
Eutech Potassium Standard, 0.1M KCl, Code no. EC-SCS-KO1-BT. To prepare this
solution from your own laboratory stock, half fill a one liter volumetric flask with distilled
water and add 7.46 grams of reagent-grade potassium chloride. Swirl the flask gently to
dissolve the solid. Fill to the mark with distilled water, cap, and upend several times to mix
the solution.
3.
Eutech Potassium Standard, 1,000 ppm K+1, Code no. EC-SCS-KO2-BT. To prepare this
solution from your own laboratory stock, half fill a one liter volumetric flask with distilled
water and add 1.91 grams of reagent-grade potassium chloride. Swirl the flask gently to
dissolve the solid. Fill to the mark with distilled water, cap and upend several times to mix
the solution.
4.
Eutech Ionic Strength Adjuster (ISA), 5M NaCl, Code no. EC-ISA-KO1-BT to keep a
constant background ionic strength present in the solution. To prepare this solution from
your own laboratory stock, half fill a 1,000 ml volumetric flask with distilled water and
add 292 grams of reagent-grade sodium chloride (NaCl). Swirl the flask gently to dissolve
the solid. Fill to the mark with distilled water, cap, and upend several times to mix the
solution. Add 2 ml of ISA to every 100 ml of sample or standard solution for a back-
ground ionic strength of 0.10M.