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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B5.2<br />

Specific Conductance<br />

The steps involved in taking specific conductance measurements are listed below:<br />

Check batteries and calibrate instrument before going into the field.<br />

Immerse the electrode in water overnight. If this is not possible due to field conditions,<br />

immerse the electrode at least one hour before use.<br />

Calibrate the instrument between each measurement or groups of closely spaced<br />

measurements. Potassium chloride standard solutions with a specific conductance closest to<br />

the values expected in the field should be used.<br />

Rinse the electrode with one or more portions of the sample to be tested.<br />

Immerse the electrode in the sample and measure the conductivity.<br />

Read and record the results in a field log book. Report the results to the nearest ten units for<br />

readings under 1000 micromhos per centimeter (µmhos/cm) and the nearest 100 units for<br />

readings over 1000 µmhos/cm. Adjust the temperature setting to the sample temperature.<br />

Repeat the procedure with fresh sample until reproducible (i.e., ± 5 percent) results are<br />

obtained.<br />

If the specific conductance measurements become erratic, or inspection shows that any platinum black<br />

has flaked off the electrode, replatinization of the electrode is necessary. See the manufacturer‘s<br />

instructions for details.<br />

Note that specific conductance is occasionally reported at temperatures other than ambient.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-127 April 2004

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