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Topic: Detecting Silver Ions in Polyamides  (Read 3327 times)

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Offline jmeehan1

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Detecting Silver Ions in Polyamides
« on: June 28, 2013, 10:34:59 AM »
I am currently being challenged with finding a device or testing method that will allow me to detect silver ions within a sample of nylon. The silver ions are a part of an antimicrobial agent that is combined with the nylon. I need to find a method to both detect the silver ions within the nylon and find the rough concentration (percentage to one decimal place) of the silver in the nylon.

Some possible methods could be an XRF or XRD, but the ones I have found are unable to detect the ions. Another possible way, and this may be a long shot, is submerging the nylon sample in a solution that will cause the silver ions to precipitate out. One last solution could be a dye that turns a different color when it comes into contact with the silver ions.

Does anyone have any ideas that could possibly help me? Almost anything will help at this point.
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Offline Corribus

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Re: Detecting Silver Ions in Polyamides
« Reply #1 on: June 28, 2013, 10:54:50 AM »
It would be routine analysis with ICP-MS or ICP-AES or even AAS, depending on your detection level needs.
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Offline Archer

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Re: Detecting Silver Ions in Polyamides
« Reply #2 on: June 29, 2013, 04:06:00 AM »
You could also use ion Chromatography.

Mind you, with all the quantitative techniques described you need to digest your matrix to get the silver in solution. I would recommend nitric acid reflux, in a fume hood.
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Offline Corribus

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Re: Detecting Silver Ions in Polyamides
« Reply #3 on: June 29, 2013, 09:54:12 AM »
Microwave digestion would be easier and safer.  Most elemental analysis labs with ICP or AAS will have either a microwave digester or a heating block for acid digestion.  Polymers are pretty easy to do.  I've done silver in polymers myself by ICP.

This kind of thing is pretty much what ICP-MS is designed for.
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Offline jmeehan1

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Re: Detecting Silver Ions in Polyamides
« Reply #4 on: July 01, 2013, 09:11:57 AM »
Thank you, everyone. This was all very helpful.
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Offline curiouscat

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Re: Detecting Silver Ions in Polyamides
« Reply #5 on: August 02, 2013, 10:06:26 AM »
Quote from: jmeehan1 on June 28, 2013, 10:34:59 AM
I am currently being challenged with finding a device or testing method that will allow me to detect silver ions within a sample of nylon. The silver ions are a part of an antimicrobial agent that is combined with the nylon. I need to find a method to both detect the silver ions within the nylon and find the rough concentration (percentage to one decimal place) of the silver in the nylon.

Roughly, what is the concentration you expect?
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