TEST METHOD: Electrical conductivity of soils
Revised 3 June 2002
EC is an important indicator of water salinity.
TASK SAFETY REQUIREMENTS
Safety boots are mandatory. Use safety glasses and other appropriate PPE in the laboratory.
|SPECIFIC JOB STEPS||HAZARDS WITHIN THIS STEP||HAZARD CONTROL|
|This method uses the 1:5 soil/water extract, as considerable Australian data exists for this method.|
|Weigh 20 g of air-dried soil and place in a stirring jar. Add 100 mL of deionised water. Shake, stir or roll for one hour, then leave for 20-30 mins to settle.||A mechanical stirring device is not available.||Shake vigorously for 2 mins every 15 mins for two hours.|
|Decant the supernatant and test the EC as follows:|
|Calibrate the meter following the directions in the EC meter manufacturer's manual||Out of date calibration solution.||Date calibration solution containers when opened and replace after the specified time (see label for details).|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 on an air dry basis.||EC does not directly correlate to total soluble salts.||An approximation is to multiply the EC by 0.34, to obtain %TSS|
Return to top
Return to Management System Contents Page