What is the conversion factor or number by which I can convert parts per thousand (ppt) from decisiemens per meter (dS/m) for soil salinity?
You will find approximate conversion factors, and the underpinning assumptions, in a Google search
Thank you for your answer. I have tried but have not found any clear conversion factor or answer Paul Milham
Try this reference: Anna F Rusydi, Correlation between conductivity and total dissolve solids in various type of water. Global Colloquium on Geoscences and Engineering, 2017. Earth and Environmental Science 118 (2918) 012019
The relations are only accurate for a single salt, e.g., KCl. For mixed salts they are approximate because of a number of factors including (chemical) speciation.
Complex algorithms may be published for mixed salts, but why do the conversion?
Thank you again.Most of the cases for analyzing tree growth used ppt units for giving relation to salinity. But we have salinity units in dS/m, so conversion is needed Paul Milham
Then it's about time you insisted that tree people report what they actually measure, which is conductivity.
You can retrospectively reverse their calculation strictly only by using the same conversion protocol that came with the instrument that they used. With luck you will be able to retrieve that from the manufacturer. Otherwise I recall seeing a figure in a text or in a methods compilation on water testing. That might be another source.
Good luck, Paul.
There are modern calculators online, but as you observed, these are not the conversions that were used in the distant past. For a modern example: onlinhttps://www.lenntech.com/calculators/conductivity/tds_engels.htm
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