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Re-evaluation of colorimetric Cl data from natural waters with DOC

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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

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