Thermo Fisher Scientific Ion Selective Electrodes Silver - Manual (Page 3)

Instruction Manual Silver/Silver Sulfide Electrode
3
EUTECH INSTRUMENTS PTE LTD.
SILVER/SULFIDE ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Silver/Sulfide Ion Electrode is used to measure silver and sulfide ions in aqueous solutions
quickly, simply, accurately, and economically. The two ions are virtually never present in solution
together, owing to the extreme insolubility of silver sulfide. Indirect measurements of cyanide or
measurements of halide ions by titration may be done with this electrode.
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. Gran's plot paper (10% volume corrected) is recommended for low
level chloride measurement.
3.
A magnetic stirrer.
4.
Eutech Silver/Sulfide Ion Combination Epoxy-body Electrode, Code no. EC-AGS-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. Water used in the
preparation of sulfide standards and of SAOB should also be de-aerated.
For Silver:
2. Eutech Ionic Strength Adjuster (ISA), 5M NaNO
3
, Code no. EC-ISA-SS1-BT. To prepare
this solution from your own laboratory stock, half fill a 1,000 ml volumetric flask with
distilled water and add 425 grams of reagent- grade sodium nitrate, NaNO
3
. Swirl the flask
to dissolve the solid. Fill the flask to the mark with distilled water, cap, and upend the
flask several times to mix the contents.
3.
Eutech Silver Standard Solution, 0.1M AgNO
3
, Code no. EC-SCS-SS1-BT. To prepare
this solution from your own laboratory stock, dry reagent-grade, pulverized silver nitrate in
a laboratory oven for one hour at 150oC. Quantitatively transfer 16.99 grams of the dried
silver nitrate to a 1 liter flask containing about 500 ml of distilled water. Swirl the flask to
dissolve the solid. Fill the flask to the mark with distilled water, cap and upend several