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  #11  
Old 05-07-2012, 08:37 PM
sensordev sensordev is offline
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Default Re: Salinity to Conductivity conversion

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Originally Posted by Ben View Post
Hi Bob, I sort of stumbled across this post when I was looking for info on salt contamination. I was just wondering if you knew how much variation it makes if you take into account that there is probably many other soluble salts in sea water, all with different conductivity/concentration ratios. Maybe there presence is insignificant compared to KCl? I was also wonder how similar the ratio was between KCl and NaCl?
Its a very interesting subject that seems to be misunderstood by a lot of people as far as I can tell in my limited search for information.
Regards,
Ben.
Ben, sorry I only come around once a year or so. Check out "The Development of the Chlorinity/Salinity Concept in Oceanography" By William J. Wallace, look for excerpts in Google and start at page 161.
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  #12  
Old 06-27-2012, 07:09 PM
KaitlinWery KaitlinWery is offline
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Default Re: Salinity to Conductivity conversion

Quote:
Originally Posted by Ben View Post
Hi Bob, I sort of stumbled across this post when I was looking for info on salt contamination. I was just wondering if you knew how much variation it makes if you take into account that there is probably many other soluble salts in sea water, all with different conductivity/concentration ratios. Maybe there presence is insignificant compared to KCl? I was also wonder how similar the ratio was between KCl and NaCl?
Its a very interesting subject that seems to be misunderstood by a lot of people as far as I can tell in my limited search for information.
Regards,
Ben.
which I believe would get around the differences.
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  #13  
Old 07-07-2012, 04:07 AM
JohnS JohnS is online now
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Default Re: Salinity to Conductivity conversion

Kaitlyn & Ben

The formulas in post #6 apply only to "sea salt." Sea salt is dominated by NaCl, but a lot of other ions. However, the oceans are pretty well mixed and the salt composition of real sea salt is pretty similar everywhere and close to the assumed "standard sea salt." What varies is the concentration vs fresh water added by rivers, or in areas of high evaporation, stronger than normal concentrations.

The UNESCO formulas in post #6 are only intended for varying concentrations of normal sea salt. The extension to mineral content in fresh water by USGS is probably dubious, but better than nothing. The ions making up the mineral content in "fresh water" are much more variable depending on what the fresh water runs through.

There is not a lot of KCl in sea salt. KCl is only used for calibration of the appartus. (I don't know the background. Maybe it is in the 140 page UNESCO document. I only skimmed it looking for the algorithm.)
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