Can LC-IRMS system be used to measure the total amount of soil extractable carbon besides its isotope ratio?
Why go for such an elaborate technique to measure simple carbon concentration?
I suggest using a TOC analyzer instead.
Thanks for replying Thiele-Bruhn Sören, I used LC-IRMS to measure the isotope by the way i want to measure the total C as well. so i do not to measure total C again by TOC analyzer. Actually, i have meausured total C by LC-IRMS, but the value looks smaller than i thought, i asked my technician, he told me the result is fine. The first impression, i cannot accept the value, then i use another method to measure total C again to check if is was machine or method problem. then the result is acceptable actually.
So the question has been resolved.
Thank you
all the best
hanyin
You will not "see" as much organic C by LC-IRMS because the LC separation is selective. Some organic C compounds will not be retained on the column and will elute with the void volume, while other organic C compounds will be irreversibly retained by the column. It's also possible that some compounds present in your sample will not be soluble in the mobile phase. Hence, there is potentially a broad suite of organic C compounds that will not be visible using one generic LC separation.
@Charles R Warren Thanks for your kind reply and awesome answers. I appreciate that a lot. Thank you very much again.
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