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- Posts: 405
- Joined: Wed Jul 18, 2012 6:45 am
- Location: Germany
We operate a total carbon analyzer here in the lab. Calibration is done using a phthalate/carbonate mixture for TC (total carbon) and IC (inorganic carbon). The TOC (total organic carbon) is calculated as TC minus IC.
Now the question: We can calculate an LOQ for TC and IC from the individual calibration curves. But what is our LOQ for TOC?
LOQ for TC and IC is in the range of 3 mg/L and 0.5 mg/L, respectivly. My feeling is that I cannot just subtract LOQ(TC) from LOQ(IC), but I should look at the uncertainty of the calibration curves. Can anyone point me to the right direction please?
Thanks a lot
Jörg