Instruction Manual
Cadmium Electrode
3
EUTECH INSTRUMENTS PTE LTD
CADMIUM ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Instruments Cadmium Ion Electrode is used to measure cadmium 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 Cadmium Ion Combination Epoxy-body Electrode, Code. no. EC-CD-03.
5.
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 Ionic Strength Adjuster (ISA), 5M NaNO
3
, Code. no. EC-ISA-CD1-BT. To prepare
this solution from your own laboratory stock, half fill a one liter volumetric flask with
distilled water and add 425 grams reagent-grade sodium nitrate, NaNO
3
. 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.
Cadmium Nitrate Standard Solution, 0.1M. To prepare this solution from your own
laboratory stock, half fill a one liter volumetric flask with distilled water and add 30.85
grams of reagent-grade Cd(NO
3
)
2
.4H
2
O. 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.
Cadmium Nitrate Standard Solution, 1,000 ppm. To prepare this solution from your own
laboratory stock, half fill a one liter volumetric flask with distilled water and add 2.74
grams of reagent-grade Cd(NO
3
)
2
.4H
2
O. Swirl the flask gently to dissolve the solid. Fill to
the mark with distilled water, cap, and upend several times to mix the solution.
5.
EDTA Titrant 1M stock solution for the titration of cadmium. To prepare this solution
from your own laboratory stock, add 37.2 grams of reagent-grade Na
2
EDTA to a 100 ml
volumetric flask about three-fourths full of distilled water. Swirl the flask gently to
