Re-evaluation of colorimetric Cl- data from natural waters with DOC
Water, Air, & Soil Pollution
By: S. A. Norton, M.J. Handlet, J. S. Kahl, and N.E. Peters
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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 ??eq 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Re-evaluation of colorimetric Cl- data from natural waters with DOC |
| Series title | Water, Air, & Soil Pollution |
| DOI | 10.1007/BF00666264 |
| Volume | 91 |
| Issue | 3-4 |
| Year Published | 1996 |
| Language | English |
| Publisher | Springer |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Water, Air, and Soil Pollution |
| First page | 283 |
| Last page | 298 |
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