Abstract
Colorimetric Cl− data from natural solutions that contain dissolved organic carbon (DOC) may be biased high. We evaluated aquatic Cl- concentrations in ecosystem compartments at the Bear Brook Watershed, Maine, and from lakes in Maine, using ion chromatography and colorimetry. DOC imparts a positive interference on colorimetric Cl− results proportional to DOC concentrations at approximately 0.8 µeq Cl−/L per mg DOC/L. The interference is not a function of Cl− concentration. The resulting bias in concentrations of Cl− may be 50% or more of typical environmental values for Cl− in areas remote from atmospheric deposition of marine aerosols. Such biased data in the literature appear to have led to spurious conclusions about recycling of Cl− by forests, the usefulness of Cl− as a conservative tracer in watershed studies, and calculations of elemental budgets, ion balance, charge density of DOC, and dry deposition factors.
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Norton, S.A., Handley, M.J., Kahl, J.S. et al. Re-evaluation of colorimetric Cl− data from natural waters with DOC. Water Air Soil Pollut 91, 283–298 (1996). https://doi.org/10.1007/BF00666264
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DOI: https://doi.org/10.1007/BF00666264