Thermo Fisher Scientific Ion Selective Electrodes Chloride - Manual (Page 18)

Instruction Manual Chloride Electrode
- 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/deionized water, or a simple mathematical miscalculation.
Sample
Look for possible interferences, 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 Interferences .)
Technique
Be sure that the electrode's limit of detection has not been exceeded. Be sure that the analysis
method is clearly understood and is compatible with the sample.
Refer to the instruction manual again. Reread sections on
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.
18