Salinity Standard
- Thread starter bio10155
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Just for reference it should be under the following journal:
Conductances of concentrated aqueous sodium and potassium chloride solutions at 25°C Chambers, J. F.; Stokes, Jean M.; Stokes, R. H. Univ. W. Australia, Nedlands, J. Phys. Chem. (1956), 60 985-6.
P.S. can you also quote what Ms/cm 30 ppt is at please.
Conductances of concentrated aqueous sodium and potassium chloride solutions at 25°C Chambers, J. F.; Stokes, Jean M.; Stokes, R. H. Univ. W. Australia, Nedlands, J. Phys. Chem. (1956), 60 985-6.
P.S. can you also quote what Ms/cm 30 ppt is at please.
Tim
What you ask is not an easy task and requires lots of calculations. I will give you this for seawater it is..........
30 ppt @ 25 C = 46.251 mS or 46,251 uS
The other issue is bulk density of the salt, as they can vary. Even Randy does not give exact measurement. I would just make up a std 3.5 % solution of both, 3.5 grams added to 96.5 ml of RO/DI water. That will get you somewhere between 32 - 35ppt and then just dilute the sample with RO/DI to get 46.251 mS = 30 ppt. Once you have done this then it will be 3.5 grams NaCl or KCl + x ml RO/DI= 30 ppt of either.
What you ask is not an easy task and requires lots of calculations. I will give you this for seawater it is..........
30 ppt @ 25 C = 46.251 mS or 46,251 uS
The other issue is bulk density of the salt, as they can vary. Even Randy does not give exact measurement. I would just make up a std 3.5 % solution of both, 3.5 grams added to 96.5 ml of RO/DI water. That will get you somewhere between 32 - 35ppt and then just dilute the sample with RO/DI to get 46.251 mS = 30 ppt. Once you have done this then it will be 3.5 grams NaCl or KCl + x ml RO/DI= 30 ppt of either.
Thank you for attempting the answer Boomer - much appreciated. The reason why I asked Randy is because he done an article about salinity standards and quoted from the above journal of published data to make a conductivity standard of 53mS/cm using both Nacl and KCL. If he still has his reference book - I would like him to chime in and tell me that's all...
He is no longer here to chime in and has been gone for months.
Yes, I no Randy did an article he got some of his data from me. The place where you work should be able to get that article for you. His article does not say where he got his data form it is just a ref he cited.
First, the scientific literature. Fortunately, many measurements of conductivity of such solutions have been made over the years. Without going into detail about how they were measured, the data from these papers indicate that a 53 mS/cm conductivity solution is provided by a 33.64 g/L (0.576 M) sodium chloride solution. That solution corresponds to 3.29 weight percent sodium chloride.2
Alternatively, one can measure conductivity of salt solutions. I made a solution of 3.24 weight percent KCl in deionized water and measured its conductivity. The reading on the uncalibrated meter was 52.5 mS/cm (it would have been 53 mS/cm with a perfectly calibrated meter).
This is the std for seawater measurement
http://www.es.flinders.edu.au/~mattom/IntroOc/notes/lecture03.html
Yes, I no Randy did an article he got some of his data from me. The place where you work should be able to get that article for you. His article does not say where he got his data form it is just a ref he cited.First, the scientific literature. Fortunately, many measurements of conductivity of such solutions have been made over the years. Without going into detail about how they were measured, the data from these papers indicate that a 53 mS/cm conductivity solution is provided by a 33.64 g/L (0.576 M) sodium chloride solution. That solution corresponds to 3.29 weight percent sodium chloride.2
Alternatively, one can measure conductivity of salt solutions. I made a solution of 3.24 weight percent KCl in deionized water and measured its conductivity. The reading on the uncalibrated meter was 52.5 mS/cm (it would have been 53 mS/cm with a perfectly calibrated meter).
This is the std for seawater measurement
http://www.es.flinders.edu.au/~mattom/IntroOc/notes/lecture03.html
