* Spiked samples have the same concentrations as the lowest calibration standard.
** Actually analyzed concentrations of spiked samples with the lowest calibration standard.
¥ Select the greater of MDLs or MDLb as the MDL for the instrument.
§ The corrected MDL = Selected MDL * dilution factor (DF = 10). These are the actual MDLs because most of samples were diluted and analyzed with a DF =10.
Table S3 Determination of MDLs of DIC, NPOC and TDN using Shimadzu TOC-VCSH and TNM-1 system from the Dong et al. (2020) datasets “Dissolved Inorganic Carbon and Dissolved Organic Carbon Data for the East River Watershed, Colorado” doi: 10.15485/1660459 and “Total Dissolved Nitrogen and Ammonia Data for the East River Watershed, Colorado.” doi: 10.15485/1660456. The relative standard deviation (RSD) of each measurement varies with concentrations and detection limits, and is generally < 3% based on 3 - 5 replicate measurements for concentrations higher than detection limits. Further details on the measurement uncertainties are included in the published datasets.