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discocarp
07/18/2008, 11:19 AM
I need a math check please. If I have 1 part of a 1.026 salinity calibration fluid (53us) and I want to convert it to a 1.009 calibration fluid, I need to add 1.889 parts rodi to the 1.026 solution. Correct?

FYI, the goal here is to be able to calibrate my pinpoint salinity monitor to 1.009 for hyposalinity treatment.

Randy Holmes-Farley
07/18/2008, 11:52 AM
Yes, your calculation is close enough for this purpose. If you really get down to it, specific gravity will not be exactly linear with salinity, but it is quite close. :)

discocarp
07/18/2008, 11:56 AM
Thanks Randy. I figured this method was close enough for my purposes. I've been a lot less exact in the past with hypo, so this is just the next step. :)

Let me ask you one other quick question. If I have my pinpoint probe calibrated to 52us, and I stick it in the 1.009 solution and it gives me, say, 18.5 or something slightly off. Can I assume that 18.5=1.009 without needing to adjust the calibration?

Does that even make sense? I don't think I phrased it well.

Randy Holmes-Farley
07/18/2008, 12:01 PM
Yes, there is no need to recalibrate. Just match the value. :)

discocarp
07/18/2008, 12:08 PM
Thanks Randy!

Randy Holmes-Farley
07/18/2008, 12:54 PM
You're welcome.

Good luck. :)