Specific conductivity (umho/cm) to Ionic strength via Russell factor

[Unregistered]

I am converting specific conducitivity values in umho/cm (also uS/cm) into ionic strength, which involves multiplying the specific conductivity by 1.6e-5 (Russell). I cannot find a good discussion anywhere for this. Can someone help? I would greatly appreciate any assistance. Thank you!

Alex

[Robert Fogt]

Try this site here:
http://www.rmprocesscontrol.co.uk/Technical.htm#Conductivity

They seem to know quite a bit, so scroll to the very bottom and you'll find a "contact us" link, so you can ask them questions directly.

[Unregistered - OP]

Thanks for the suggestion. I'll give them a shot.

[Unregistered]

I am converting specific conducitivity values in umho/cm (also uS/cm) into ionic strength, which involves multiplying the specific conductivity by 1.6e-5 (Russell). I cannot find a good discussion anywhere for this. Can someone help? I would greatly appreciate any assistance. Thank you!

Alex


What is the conversion of topsoil in pounds to cubic yards?...Does anyone know?? ie one cubic yard of topsoil is about how many pounds???

[Unregistered]

I am converting specific conducitivity values in umho/cm (also uS/cm) into ionic strength, which involves multiplying the specific conductivity by 1.6e-5 (Russell). I cannot find a good discussion anywhere for this. Can someone help? I would greatly appreciate any assistance. Thank you!

Alex

The Russel equation is derived from a correlation between ionic strength and conductivity for 13 waters of widely varying composition. For further information see L. L. Russel's PhD thesis at the University of California "Chemical aspects o0f groundwater recharge with wastewaters". In my opinion, this equation should be use only for an estimative purpose. There are many variables that may affect the concentration of electrical charges in real samples and they are not fully known yet.

[Unregistered]

I am converting specific conducitivity values in umho/cm (also uS/cm) into ionic strength, which involves multiplying the specific conductivity by 1.6e-5 (Russell). I cannot find a good discussion anywhere for this. Can someone help? I would greatly appreciate any assistance. Thank you!

Alex

This is an old value. The article by Griffin and Jurinak Soil Science, 1973, Vol.116, pp26-30, gives a conversion constant of 0.0135 and explains how they got iyt and its limitations. This is an empirical conversion, and is not universally applicable.

[Unregistered]

I am converting specific conducitivity values in umho/cm (also uS/cm) into ionic strength, which involves multiplying the specific conductivity by 1.6e-5 (Russell). I cannot find a good discussion anywhere for this. Can someone help? I would greatly appreciate any assistance. Thank you!

Alex

Russell actually took the value from an earlier publication than Griffen's.
See Ponnamperuma et al., Soil Science, 1966, Vol.102, pp 408-418

[Unregistered]

RE: soil weight

It depends upon it's " bulk density" but a reasonable range is 2100 - 2500 lbs/cuyd

[Unregistered]

This is actually bogus. There is no fixed conversion factor for specific conductance to ionic strength. For a specific electrolyte at low concentrations (when conductance is still linearly related to concentration), a conversion factor can be generated. At concentrations above 10 mM as gradually conductance becomes proportional to square root of concentration rather than concentration any such conversion isfactor is meaningless. Dasgupta@uta.edu