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| Abstract or Summary |
- Resazurin (Raz) and its reaction product resorufin
(Rru) have increasingly been used as reactive tracers to quantify
metabolic activity and hyporheic exchange in streams.
Previous work has indicated that these compounds undergo
sorption in stream sediments. We present laboratory experiments
on Raz and Rru transport, sorption, and transformation,
consisting of 4 column and 72 batch tests using 2 sediments
with different physicochemical properties under neutral
(pH=7) and alkaline (pH=9) conditions. The study
aimed at identifying the key processes of reactive transport
of Raz and Rru in streambed sediments and the experimental
setup best suited for their determination. Data
from column experiments were simulated by a travel-time-based
model accounting for physical transport, equilibrium
and kinetic sorption, and three first-order reactions. We derived
the travel-time distributions directly from the breakthrough
curve (BTC) of the conservative tracer, fluorescein,
rather than from fitting an advective-dispersive transport
model, and inferred from those distributions the transfer
functions of Raz and Rru, which provided conclusive approximations
of the measured BTCs. The most likely reactive
transport parameters and their uncertainty were determined
by a Markov chain–Monte Carlo approach. Sorption
isotherms of both compounds were obtained from batch experiments.
We found that kinetic sorption dominates sorption
of both Raz and Rru, with characteristic timescales of sorption
in the order of 12 to 298 min. Linear sorption models for
both Raz and Rru appeared adequate for concentrations that
are typically applied in field tracer tests. The proposed two-site
sorption model helps to interpret transient tracer tests using
the Raz–Rru system.
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| Date Available |
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| Date Issued |
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| Citation |
- Lemke, D., González-Pinzón, R., Liao, Z., Wöhling, T., Osenbrück, K., Haggerty, R., & Cirpka, O. A. (2014). Sorption and transformation of the reactive tracers resazurin and resorufin in natural river sediments. Hydrology and Earth System Sciences, 18(8), 3151-3163. doi:10.5194/hess-18-3151-2014
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| Funding Statement (additional comments about funding) |
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| Peer Reviewed |
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| Additional Information |
- description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-10-13T15:31:41Z (GMT) No. of bitstreams: 4
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- description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-10-13T15:31:27Z
No. of bitstreams: 4
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- description.provenance : Made available in DSpace on 2014-10-13T15:31:41Z (GMT). No. of bitstreams: 4
license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5)
HaggertyRoyCEOASSorptionTransformationReactive.pdf: 468750 bytes, checksum: 5c8362b19a989bae1b27306ee27a92d0 (MD5)
HaggertyRoyCEOASSorptionTransformationReactive_SupplementaryMaterial.xlsx: 312767 bytes, checksum: 88b70daf4e6975d7abd391537d6a9a2f (MD5)
HaggertyRoyCEOASSorptionTransformationReactive_SupplementCoverLetter.pdf: 17826 bytes, checksum: 61cbbf0e0916135384ad0a75b6574e6d (MD5)
Previous issue date: 2014-08-25
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