TOC runs

[janzalone]

OscarBAL; Thanks for the quick response. I Looked into this and the software subtracts the TOC and TC concentration from the blank from the standard. I also tried running blanks and standards as samples and manually subtracting them and it still gives a high result. It just doesn't make any sense how I can get 20 to 40 ppb TOC in the blank and always an additional 100 PPB in the 500 PPB standards.

[oscarBAL]

Have you tried to prepare a check STD put it in vial and run it as a sample? and the water used for dilution run it as sample too at leas 2 replicates (diferentes vials); this could help you discard if the instrumet is doing a bad dilution. if GE don't recomend dilution then; you will have to ask them; "hey I am using the STD you recomend and still I am getting high recovery"

Other think you could do is prepare calibration STD or get it already diluted and run them as sample use excel for do your own calibration and "see" what hapen compare that against the result of the instrument. another option it could be that yor Stock solution have a real concentration lower your slope it would be the same but the y-intercept could afect and produce higher results.