aga
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Mohr's Titration on Your Soil
Today some samphire seeds arrived, and it would be useful to know the NaCl concentration in soil from a coastal area of northern Europe, or any area
where the stuff grows naturally.
This study showed that greater than 30g/L NaCl greatly reduces the probability of germination of the seeds, so that would be an upper limit on the
concentration desired in the feed water :-
http://digitalcommons.usu.edu/nrei/vol15/iss1/48/
So, if you live near the sea in northern Europe, or have seen some samphire growing near where you live, could you please do a Mohr's Titration to
determine the actual chloride content of some soil.
Here's a description of the process :-
http://www.outreach.canterbury.ac.nz/chemistry/chloride_mohr...
Many thanks in advance !
[Edited on 28-12-2015 by aga]
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Artemus Gordon
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Far be it for me to dissuade anyone from doing a Mohr's titration, but I don't quite understand what you are trying to accomplish, Aga. First, in
humans, it is generally the Sodium ion that is of concern, not the Chloride. I assume the same thing applies to plants, but I could be wrong. Second,
if you are trying to grow samphire (which already is a NaCl tolerant plant) in highly saline soil, wouldn't you be solely concerned with the salinity
at your own location? Why would you care about the soil in some other location?
Also, I would think that germination would be more salt-sensitive than growth of a fairly mature plant. If I wanted to grow samphire in maximum saline
conditions, I would baby the seeds and then transplant the mature plants to my salty soil.
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blogfast25
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On the salinity of northern European coastal areas, wide surveys must already exist. Google is your friend.
Even if a few people responded to your call it would only constitute a few, scattered data points.
AG is also right that it's the cations that are important in metabolic electrolytes.
[Edited on 29-12-2015 by blogfast25]
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Bert
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Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
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| Quote: |
Half-way down Hangs one that gathers samphire; dreadful trade! (King Lear- Act IV, Scene VI)
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Well, I learned something new today. I knew kelp was gathered to be burned for the residual Soda ash and Iodine compounds, never heard of samphire.
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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aga
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The samphire will be grown (if the seeds sprout !) under entirely artifical conditions with no soil and an aqueous feed.
The bible on getting seeds to sprout is "Seed Germination, Theory and Practice" by Norman C Deno - a Chemist ! Well worth looking up if you want to
sprout seeds.
Sodium probably is more important as a metabolyte, just that i am familiar with Mohr's method, and measuring the chloride would give a very good
indication of the sodium concentration.
Having no samphire locally means that i can't just go take a soil sample to determine exactly how saline the natural conditions are.
A series of 60 day long experiments is obviously possible, just that i hoped somebody was looking for a quick chemistry project, the results being
used in a tangible (and protographable) way.
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