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Instruction Manual
Cyanide Electrode
3
EUTECH INSTRUMENTS PTE LTD.
CYANIDE ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Instruments Cyanide Ion Electrode is used to measure cyanide ions in aqueous solutions
quickly, simply, accurately, and economically.
*IMPORTANT NOTICE*
Acidic cyanide solutions produce hydrogen cyanide (HCN) gas, highly toxic whether breathed or
absorbed through the skin. Use of the proper and recommended ionic strength adjuster (ISA) will
keep the solution pH above 10. If measurements in acidic solution are necessary (decomplexing
procedure as given in the section Complexation), THIS PROCEDURE MUST BE DONE IN A
FUME HOOD.
Use a pipet bulb when pipeting cyanide solutions, as these solutions are highly toxic.
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.
meter in the mV mode.
3.
A magnetic stirrer.
4.
Eutech Cyanide Ion Combination Epoxy-body Electrode, Code no. EC-CN-03.
5.
Lab-ware made of plastic, not glass.
6.
Polishing Paper, Code no. EC-MIS-PP, to polish dirty or etched electrode membranes.
Required Solutions
1.
Deionized or distilled water for solution and standard preparation.
2.
Eutech Cyanide Ionic Strength Adjuster (ISA), 10M NaOH, Code no. EC-ISA-CN1-BT.
To prepare the ISA from your own laboratory stock, fill a 1,000 ml beaker with about 900
ml of distilled water. While gently stirring the solution under a hood, slowly add 400
grams of reagent-grade sodium hydroxide. Transfer the solution quantitatively to a one
liter volumetric flask after the solid NaOH has dissolved and the beaker has cooled. Dilute
to the mark with distilled water, cap, and upend several times to thoroughly mix the
solution. Store in a plastic bottle.
To prepare the ISA from your own laboratory stock, fill a 1,000 ml beaker with about 900
ml of distilled water. While gently stirring the solution under a hood, slowly add 400
grams of reagent-grade sodium hydroxide. Transfer the solution quantitatively to a one
liter volumetric flask after the solid NaOH has dissolved and the beaker has cooled. Dilute
to the mark with distilled water, cap, and upend several times to thoroughly mix the
solution. Store in a plastic bottle.