Thermo Fisher Scientific Ion Selective Electrodes Silver - Manual (Page 23)

Instruction Manual Silver/Silver Sulfide Electrode
23
- Clean and rinse the electrodes thoroughly.
- Prepare the electrodes properly.
- Use the proper filling solution.
- Adjust the pH and the ionic strength of the solution by the use of the proper ISA.
- Measure correctly and accurately.
- Review
TROUBLESHOOTING HINTS.
Standards and Reagents
Whenever problems arise with the measuring procedure that has been used successfully in the past,
be sure to check the standard and reagent solutions. If in doubt about the credibility of any of the
solutions, prepare them again. Errors may result from contamination of the ISA, incorrect dilution
of standards, poor quality distilled or deionized water, or a simple mathematical miscalculation.
Sample
Look for possible interference, complexing agents, or substances which could affect the response or
physically damage the sensing electrode (or the reference electrode) if the electrodes work perfectly
in the standard, but not in the sample. Try to determine the composition of the samples prior to
testing to eliminate a problem before it starts. (See
Measuring Hints, Sample Requirements
, and
Interference
.)
Technique
Be sure that the electrode's limit of detection has not been exceeded and the analysis method is
clearly understood and is compatible with the sample.
Refer to the instruction manual again. Reread the sections
GENERAL PREPARATION
and
ELECTRODE CHARACTERISTICS.
If trouble still persists, call Eutech Instruments Pte Ltd. at (65) 6778-6876 and ask for the Customer
Services Department.