I am using a Shimadzu TOC analyzer for measuring organic carbon present in my sample. However, when I run my sample for TOC (TC-IC) analysis and TIC analysis, IC values in these two runs don't match. Technically, they must be the same.
For example:
Same sample tested for TOC (TC-IC) and TIC
TOC result: TOC: 85.24mg/L, TC:86.15 mg/L ,IC: 0.9127 mg/L
TIC result: IC: 57.32 mg/L
Why is this happening?
Thank you.
Have you made replicate measurements of the given sample. Follow sample preparation method protocols meticulously. Calibrate the analyzers using standard procedures. Check for the precision, accuracy for ensuring the reproducibility in the results using standard deviation and relative standard deviation.
Dear Sheetal, Please update information: What is the model of your TOC analyzer? What kind of sample have you analyzed? Have you checked results with standard solutions? Regards Marek
Your issue would seem like a similar situation to the NPOC-IC (NPOC minus IC) method on my TOC-L.
This method was setup to check on any leftover IC using the NPOC method.
It sets the results out as
NPOC-IC
NPOC
IC
The NPOC result should equal the sum of NPOC-IC and IC results. The IC shows only the leftover IC after Acid addition and Sparging to remove most of the IC.
The IC method is used to measure the real IC.
Your method does not appear to be measuring TC, only TOC. Do you have a separate TC method?
Hope that solves your problem. Better application notes when methods are set up by Shimadzu would greatly assist in method transparency.
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