DOI: 10.5194/hess-18-3151-2014
Scopus记录号: 2-s2.0-84935101675
论文题名: Sorption and transformation of the reactive tracers resazurin and resorufin in natural river sediments
作者: Lemke D ; , González-Pinzón R ; , Liao Z ; , Wöhling T ; , Osenbrück K ; , Haggerty R ; , Cirpka O ; A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 8 起始页码: 3151
结束页码: 3163
语种: 英语
Scopus关键词: Alkalinity
; Computer simulation
; Curve fitting
; Experiments
; Markov processes
; Radioactive tracers
; Sediments
; Travel time
; Advective-dispersive transport
; Breakthrough curve
; Column experiments
; Conservative tracers
; First order reactions
; Laboratory experiments
; Physicochemical property
; Streambed sediments
; Sorption
; dye tracer
; fluvial deposit
; physicochemical property
; reactive transport
; sediment chemistry
; sorption
; stream bed
; transformation
英文摘要: 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 Combining double low line 7) and alkaline (pH Combining double low line 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. © Author(s) 2014. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78160
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: University of Tübingen, Center for Applied Geoscience, Hölderlinstr. 12, 72074 Tubingen, Germany; Water and Earth System Science (WESS) Competence Cluster, University of Tübingen, Hölderlinstr. 12, 72074 Tubingen, Germany; University of New Mexico, Department of Civil Engineering, 210 University Blvd NE, Albuquerque, NM 87131, United States; Oregon State University, College of Earth, Ocean and Atmospheric Sciences, 104 Wilkinson Hall, Corvallis, OR 97331-5506, United States
Recommended Citation:
Lemke D,, González-Pinzón R,, Liao Z,et al. Sorption and transformation of the reactive tracers resazurin and resorufin in natural river sediments[J]. Hydrology and Earth System Sciences,2014-01-01,18(8)