Continuation of Is the water underneath Europa's ice cap potable?

Recently, there was a question which discussed if water from Europa's ice caps is potable or not and from the answers, we gathered from the fact that the water is too salty to drink and only the most salt tolerant organisms would barely able to survive the environment.

Now there is a term called salinity which by definition is the saltiness or amount of salt dissolved in a body of water and is an important factor in determining many aspects of the chemistry of natural waters and of biological processes within it. With that term, there is a certain scale called Thalassic series often used to measure salt content of seawater and lakes/rivers of our planet, Earth and rate accordingly. Can we use such series for extraterrestrial water? Come to think of it, if we consider salinity a factor and create a certain scale, we can study many aspects like biological process and conditions and we can consider whether such conditions is suitable for sustaining life.

Question: Is there any "scale" to rate salinity of extraterrestrial water?

  • $\begingroup$ I suspect at least part of the answer is osmolarity, or more specifically tonicity. But of course that's not sufficient on its own to determine potability (or suitability for terrestrial life in general), since the nature of the dissolved ions matters too — some can be a lot more toxic than others. $\endgroup$ – Ilmari Karonen Dec 6 '20 at 10:26
  • $\begingroup$ It is similar to ask if there is any scale for measuring temperature or whatever on/at/in extraterrestrial bodies. $\endgroup$ – Alchimista Dec 9 '20 at 10:29

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