| method | TC, TIC and NPOC are detected using a SHIMADZU TOC 5050 |
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| TC | total carbon, detection of CO2 produced from pure sample at 680°C |
| TIC | total inorganic carbon, detection of CO2 produced from sample by addition of concentrated H3PO4 |
| TOC | total organic carbon difference between TC and TIC |
| NPOC | non-purgeable organic carbon. sample is treated with H3PO4 and stripped with CO2-free synthetic air. detection of CO2 produced from treated sample at 680°C |