Hi all, is there a way to link the EC of a saturated soil paste (not an extract, so ECp) prepared at a soil:water ratio of 1:1 and the salinity of that sample?
I already found the procedure of Rhoades et al. to link ECp to ECe and then use TDS = 640.ECe but the problem there is that I do not have data on the saturation percentage (SP) of the sample, as we did not measure the volume.
(Samples was prepared as: 50 grams of soil + 50 ml distilled water, shaken and left to rest, HannaEC probe measured the EC in dS/m)
Yes it is possible.Many attempts in the past have been made , especially when you look at the initial work of USDA Salinity Laboratory1954 . No universal relation will work , need a work out the relation , considering soil texture and mineralogy as two dominating factors....
Electrical conductivity (EC) is a numerical expression of the inherent ability of a medium to carry an electric current. Because the EC and total salt concentration of an aqueous solution are closely related, EC is commonly used as an expression of the total dissolved salt concentration of an aqueous sample, even though it is also affected by the temperature of the sample and by the mobility, valences and relative concentrations of the individual ions comprising the solution (water itself is a very poor conductor of electricity). Furthermore, not all dissolved solutes exist as charged-species; some are non-ionic and some of the ions combine to form ion-pairs which are less charged (they may even be neutral) and, thus, contribute proportionately less to electrical conduction than when fully dissociated. The determination of EC generally involves the physical measurement of the materials' electrical resistance (R), which is expressed in ohms.
See attachment file , its useful
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