{title2}
{wiki}

An <ion selective electrode> is tool used in  <analytical chemistry> used to determine the concentration of a given <ion> in a solution.

The method can determine the concentration of one ion even if there are multiple different types of <ion> in the solution, although in some cases this can alter the results. This is done with the help of a selective membrane that only allows certain ions through.

One cool example application mentioned on <LibreTexts>https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Physical_Methods_in_Chemistry_and_Nano_Science_(Barron)/01%3A_Elemental_Analysis/1.07%3A_Ion_Selective_Electrode_Analysis{ref} is the measurement of <fluorine> concentration in water. They explain that <fluorine> is added to the drinking water supply in some countries to help protect people's teeth, and so you want to be able to measure as part of quality control to make sure it is being added in correct the quantities.

The method requires calibrating with calibrating solutions which takes one hour, but once you are calibrated you just stick the sensor into the <analyte> and get readings in a minute without any expendables. The membrane seems to be a bit fragile which requires care, but overall it looks like a convenient method.

\Image[https://upload.wikimedia.org/wikipedia/commons/9/95/General_ISE_Set-Up.png]
{title=<Ion selective electrode> schematic}
{height=600}

\Image[https://web.archive.org/web/20220605032719im_/https://files.mtstatic.com/site_4334/142875/0?Expires=1654403194&Signature=aAPjJy6lmj0OVoTs6TFibKDDW1XlYFMdZp9qCdNChcca6NCOaHHQqFu1oH9gzt6Dwe2YZMW1WdaPkvN8kAoW29qoXQ-ExXs9XeIA0AhtuQSO3GvNXaiVISse2zEWtHB2wYz5KRggWJ6qHk34z8Jti8w5V0Qwqg6hK6RHt5AmGkw_&Key-Pair-Id=APKAJ5Y6AV4GI7A555NA]
{title=Sample calibration curve for an <ion selective electrode>}
{description=The curve is simple and log linear, so once you have that it is easy to fit new measurements to the curve.}
{height=600}
{source=https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Physical_Methods_in_Chemistry_and_Nano_Science_(Barron)/01%3A_Elemental_Analysis/1.07%3A_Ion_Selective_Electrode_Analysis}

\Video[https://www.youtube.com/watch?v=bGO_GvpVwVU]
{title=General Principles of Ion Selective Electrodes by Jacob Stewart}

\Video[https://www.youtube.com/watch?v=5NREQwnaGcE]
{title=<Ion selective electrodes> Tech Tips by Vernier}
{description=
The plump <Asian American> lady with a <PhD> explains how to use the thing.

It seems like a proprietary training video given with the product that this Peruvian university decided to upload to <YouTube>. Heroes.
}

\Video[https://www.youtube.com/watch?v=NHByG4g5-RE]
{title=Using an Ion Selective Electrode by <University of Alberta>}

Bibliography:
* https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Physical_Methods_in_Chemistry_and_Nano_Science_(Barron)/01%3A_Elemental_Analysis/1.07%3A_Ion_Selective_Electrode_Analysis


Ion selective electrode

The determination of fluoride is a classic one. It was the only experiment we did on crystalline membrane ISEs. (We also used TISAB, a helpful solution for the experiment, to make more accurate measurements). I didn't even mention crystalline membrane ISEs...

There have been many discussions around fluoride use in water hahahhaha. Here in Europe it's not present. But as far as I know, fluoride is still placed on other common products, like table salt.


Nice article

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Didn't know that crypto bots finally arrived...
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Ciro Santilli's Homepage

I wrote some new stuff and decided to publish them. When I did, I got this error: 

``
web_delete: 0: (@pioyi/claus-processcreated-by-the-german-chemist-carl-friedrich-claus-it-makes-it-possible-to-convert-hydrogen-sulfide-from-natural-gas-to-elemental-sulfur-the-overall-reaction-can-be-descibed-as-follows-2-h-2s-plus-so-2-3s-plus-2h-20.bigb)
HTTP error status: 422
Error messages from server:
error: @pioyi/claus-processcreated-by-the-german-chemist-carl-friedrich-claus-it-makes-it-possible-to-convert-hydrogen-sulfide-from-natural-gas-to-elemental-sulfur-the-overall-reaction-can-be-descibed-as-follows-2-h-2s-plus-so-2-3s-plus-2h-20.bigb:1:205: unterminated literal argument
``

It refers to an old text that was contained in the bigb file. I remember that I interacted with this part of the file (or with a different one. I don't really remember) while I was writing the new one.

Kind of unxplainable, but my first guess was that I hadn't closed the latex segment somewhere. It turned out that everything has been closed as needed.

The guilty part in question:
``
==== Claus process

Created by the german chemist Carl Friedrich Claus, it makes it possible to convert hydrogen sulfide (from natural gas) to elemental sulfur. The overall reaction can be descibed as follows: 

$$2H_2S + SO_2 \rightarrow 3S + 2H_20$$
``

Am I missing something? I hope not!


Problems with export of index.bigb

Whenever I try to write an article, (on your markdown, not in the CLI version), many times the text gets all deleted. This happens when I type special characters such as "dollar sign" (in fact, as I was about to rewrite it, my whole browser froze and the website was experiencing high lag for some reason). 

So for some reason I can't write all that. I can't write dot dot either. Also headers don't work!  "equals + space" seems to be one of the deadly combos that delete all content.

Some specific key combinations cause the whole text to get deleted. Please fix this issue, so we can start writing articles. Also a save button (like a draft) should be present, because you never know if anything is going to crush suddenly.

I am waiting for the updated version or for an explanation.


# id	 Title	 Comments	 Created	 Updated
cirosantilli/ion-selective-electrode#1	Nice article	5	2025-01-29	2025-01-29
cynthiajoe6912#1	I am Pioyi and I approve this message	1	2025-01-25	2025-01-25
cirosantilli#3	Problems with export of index.bigb	15	2024-09-20	2024-09-20
cirosantilli#2	Some problems I have encountered so far	2	2024-08-18	2024-08-18

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