Hello, Thanks for the reply.
Indeed I have read and re-read this paper many times. Unfortunately I do not have a suppressed IC hooked up to my ICPMS so I cannot replicate the chromatographic conditions precisely . I did notice that it was observed that Selenosulfate in a sample mixed from 2 sites of FDG water the Selenosulfate disappeared completely, indicating that the matrix of one of the samples converted the sample to selenite. Stability certainly looks like one of the challenges.
The mobile phase in this paper is NaOH of varying strength, so quite basic. My mobile phase consists of mixture of ACN, Ammonia Nitrate and TMAH at pH 9.5. I may have to resort to hooking up some chemical suppression on my HPLC to be able to run eluent as described in this paper more closely.
I may also synthesize selenosulfate myself, based on a few other papers diluted solutions also have some limited stability and my purchased solution may not be fit for purpose.
National Technical Specialist-Inorganics, Environmental Canada