Thank you for this discussion, very timely. Any advice on what
detection limits to expect for this? We're interested in analysis of
groundwaters and surface waters, probably present as iodide. We have
both ICP-OES and ICP-MS available. Would be interested in hearing
from anyone with experience in this application.
Dr. Marc Norman
Research School of Earth Sciences
Australian National University
Canberra ACT 0200 Australia
On 28/01/2010, at 6:25 AM, DeWitt Payne wrote:
> Iodate would be the preferred oxidation state
> for samples and standards. It is relatively non-complexing,
> non-volatile and non-adsorptive. Provided there are no other reducing
> agents present in excess, sodium hypochlorite will oxidize iodide to
> iodate. I don't know if hypochlorite is compatible with TMAOH,
> though. If for some reason you need to have iodide then addition
> of a reducing agent
> like ascorbic acid may be necessary to avoid oxidation to iodine. Of
> course, that may have an effect on other elements as well.
> DeWitt Payne
> Kingsport, TN 37663
> --- On Wed, 1/27/10, Clucas, Lynne <[log in to unmask]> wrote:
> From: Clucas, Lynne <[log in to unmask]>
> Subject: Iodine analysis ICP-OES
> To: [log in to unmask]
> Date: Wednesday, January 27, 2010, 12:48 PM
> I have a request to analyse Iodine in plant and soil samples. I
> have played around a bit on our ICP and have good clean peaks using
> lines 178.215 (FACT gets rid of the P interference very well)
> 182.976, 179.847 and less so, 206.163. So I don't have any problem
> with the ICP's ability to detect I.
> Sample dissolution techniques will have to be my focus when a
> supply of TMAH arrives.
> Has anyone out there in the big wide world any experience with this ?
> Is there any way to use already HNO3 acid digested samples ?
> I have a Varian ICP-OES 720 axial instrument with USN and VGA-77
> accessories and couple of years experience doing the basics mostly
> well but just skimming the surface of the instuments capabilities I
> Any help would be appreciated
> Research Technician
> Soil and Physical Sciences Group
> Faculty of Agriculture and Life Sciences
> PO Box 84
> Lincoln University
> Lincoln 7647
> New Zealand
> ph: + 64 3 3218 244
> fax: + 64 3 3253 607
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