Calculate EC in GSS 9.0

[Paulina Rios]

Hello!,

 

I am new using GWB, and I am trying to calculate EC in GSS 9.0 (on GWB Pro). When I add the analyte and ask for "Calculate", some cell show calculation results, and others are empty (21 samples, only 8 have results). I already try updating GWB and calculating again the EC. (I am sorry for my English, not native).

Can someone help me? thanks in advance

[katezat]

Hello Paulina,

 

Can you please attach your GSS file? Then I'd be happy to take a look and will have a better understanding of what you're trying to do.

 

Thank you,

 

Katelyn

Aqueous Solutions LLC

[Paulina Rios]

Hi Katelyn,

 

Thank you so much. In the file you will find a bunch of water samples and all the analytes I can get in. pH, Temperature, Eh are field parameters, and some samples were VERY high in sediment, I already calculate the ion equilibrium error and for those samples is up to 70%. But still can not calculate EC (CE in Spanish). Thanks again

 

Cheers,

Paulina

2_QA-QC CE 2016.07.25.gss

[katezat]

Hello Paulina,

 

Thank you for sharing your spreadsheet. I would recommend you take a look at conductivity.dat (File - View - conductivity.dat from within GSS) and the reference mentioned for explanation of calculating electrical conductivity. You’ll notice the calculation is temperature dependent, and limited to values between 20⁰C and 30⁰C, which is why it was only calculated for some of your samples.

 

Kind regards,

 

Katelyn

Aqueous Solutions LLC

[katezat]

Hello Paulina,

 

I also wanted to mention that our latest release, GWB11, offers an alternative method for calculating electrical conductivity*. The USGS electrical conductivity model is valid over a much larger temperature (0 – 95 ⁰C) and ionic strength (0 – 1 molal) range, so you would be able to calculate the conductivity for all of your samples. Please visit http://gwb.com/requests.php to request an upgrade quote or free 30 day demo.

 

*Reference: McCleskey, R. Blaine, Nordstrom, D. Kirk, Ryan, Joseph N., and Ball, James W., 2012, A new method of calculating electrical conductivity with applications to natural waters: Geochimica et Cosmochimica Acta, v. 77, p. 369-382.

 

Kind regards,

 

Katelyn

Aqueous Solutions LLC