TEST METHOD: Electrical conductivity of waters

Revised 3 June 2002

OVERVIEW

EC is an important indicator of water salinity.

TASK SAFETY REQUIREMENTS

Safety boots are mandatory

SPECIFIC JOB STEPS HAZARDS WITHIN THIS STEP HAZARD CONTROL
Calibrate the meter following the directions in the EC meter manufacturer's manual Out of date calibration solution. Date calibration solution containers when opened and replace after the specified time (see label for details).
Insert the EC probe and temperature probe (if separate) into the water sample and stir gently.    
Wait until the reading stabilises and record reading in the laboratory daybook. Report the EC as mS/cm. EC does not directly correlate to total soluble salts. An approximation useful for salinities up to seawater strength is to multiply the EC by 670, to obtain TSS mg/L.

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