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Author: Subject: Ion Chromatography
neptunium
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[*] posted on 3-11-2021 at 03:40
Ion Chromatography


I could not find a topic anywhere dealing with ion chromatography and I think the subject deserve some attention.
Several years ago at a previous job, as an analyst for anions, I had a good time running the Dionex ICS2000 for a living. I have always been curious about what things are made of and see concentration of various chemical change with time, weather etc...
So I found a few module of the older DX500 on ebay and put them together for some analysis right at home. The good part about Ion Chromatography is that it can be ran and shut down fairly quickly (compare to other analytical means) does not requires large amount of cryogenics (Gamma spec, ICPs...) and can be pretty easy to use once the set up and calibrations are done...
i`ll post some screen shots later if the videos are too much time consuming,
The annoying part is the astronomical amount of time consumed setting it up and calibrating the instrument tweaking it for best results...All of which uses consumables, mobile phases and standards which can be tricky to obtain.
But Covid forced me in quarantine last year and i had plenty of time to take care of things and here is the results:
https://www.youtube.com/watch?v=axJ5pRWALac
the cations side took a little longer but i did obtain good results
https://www.youtube.com/watch?v=vapXyqNjvCs
With that i could partake in some fun including ammonium ion in my own piss...vastly diluted ...
https://www.youtube.com/watch?v=SpV7iOuYnPg
All of these analysis are hovering in the low ppm range and a simple trick allowed me to get a 1000 fold better resolution to low ppb... pretty good for old equipment set up by my amateur...
https://www.youtube.com/watch?v=7DuXfqus8zI&t=2s
I thought this could be of interest to the forum and since some of us are doing chemistry at home with sometimes questionable results, an ion chromatograph can help determine qualitatively AND quantitatively potential unknown .. I know i`ve been there with metals extractions from minerals not knowing if i had a sulfate or a phosphate...

i will post some screen shots later if the videos are too much time consuming...


[Edited on 3-11-2021 by neptunium]




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[*] posted on 3-11-2021 at 07:45


Wow, I really like your channel! Lots of interesting videos, and some pretty advanced stuff in there. It's really cool to see actual practical use of these different machines, instead of just reading about them.
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neptunium
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[*] posted on 13-11-2021 at 15:36


here is water from the tap in the midwest....yes there is Fluorides...

tap water str8.bmp - 2.8MB


no surprised with the chlorides...
Now if you like water from Absopure, here is what you are drinking..
Anions


absopure.bmp - 2.8MB


and Cations....




absopure.bmp - 2.8MB


The next one is an extract from a rock which contain Cesium...
Anions



polucite.bmp - 2.8MB

and cations where Cesium does show up after digestion...




Both of which could help the prospector....
now let me show you my own anions pee......


urine 100.bmp - 2.8MB


and cation piss...



urine x100.bmp - 2.8MB
good...healthy minerals there....:P

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neptunium
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[*] posted on 13-11-2021 at 15:46


The equipment



IMG_6407.jpg - 382kB
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