Organic ICP-OES internal standard


I'm setting up an ICP-OES method for quantification of sulfur in FAME. Agilent has supplied me with a method where we can inject FAME directly. I want to use an internal standard in my method but the internal standards I have are all in aqueous solution. I would like to know if there are internal standards in organic matrix and if they can be added on-line or need to be added before in a sample preparation.

I'm using an AVS 7 switching valve and an SPS 4 autosampler on the Agilent 5800 ICP-OES.

Thanks in advance!

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