Impact of PBC concentration on the DOC-to-POC balance. Potential impact of PBC concentration on the DOC-to-POC balance, as represented by the POC/DOC ratio. The POC/DOC ratio was calculated as [(T-POC) – (PBC)]/[(T-DOC) – (DBC)], excluding PBC and DBC. The POC/DOC ratio as a function of PBC concentration was fitted to a power law relationship, [POC/DOC] = a [PBC]^b, where a and b are constants. The measured POC/DOC ratios and PBC concentrations were plotted in log-log coordinates to obtain a and b. The three values represented by open circles, were excluded from the regression analysis. DOI: https://doi.org/10.1525/elementa.255.f17