DOI: 10.5194/hess-24-977-2020
论文题名: Controls of fluorescent tracer retention by soils and sediments
作者: Bork M. ; Lange J. ; Graf-Rosenfellner M. ; Lang F.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 2 起始页码: 977
结束页码: 989
语种: 英语
Scopus关键词: Adsorption
; Clay minerals
; Fluorescence
; Organic carbon
; Organic pollutants
; pH
; Sediments
; Soils
; Tracers
; Artificial tracers
; Batch experiments
; Fluorescent dyes
; Linear sorption
; Soils and sediments
; Sorption isotherms
; Sulforhodamine B
; Terrestrial ecosystems
; Soil pollution
; clay mineral
; montmorillonite
; organic carbon
; organic matter
; sorption
; topsoil
; tracer
英文摘要: Fluorescent dyes like uranine (UR) and sulforhodamine B (SRB) have been used for decades as artificial tracers in hydrological studies. Recently, attempts have been made to trace organic pollutants in soil with such dyes, but the knowledge of the controls of sorption of UR and SRB in soils is still incomplete and poorly standardised. For this reason, we selectively controlled clay, organic matter (OM) and pH within batch experiments and quantified systematically the impact and possible interactions of these controls on the adsorption of UR and SRB. Sorption isotherms were determined using a sandy sediment and a silty loamy subsoil and topsoil (0.6-2.8% organic carbon (OC)) at pH values of 5.5, 6.5 and 7.5. Additionally, OM was removed from topsoil and subsoil samples by H2O2 treatment and the clay mineral montmorillonite was added to the sandy sediment. We found a negative relationship between the linear sorption coefficient Kd and pH that was stronger for UR than for SRB. Increasing repulsion forces between negative sorption sites and tracer functional groups at higher pH values might explain these results. Adsorption of UR and SRB increased with increasing clay content due to more specific surface area and associated sorption sites. An addition of 4% of the clay mineral montmorillonite sufficed to adsorb nearly 100% of both tracers. The influence of OM was more complex: while the adsorption of UR increased with increasing OC concentration, the opposite was observed for SRB. Our study indicates the high relevance of physico-chemical properties of soils and sediments for the fate of applied tracers and for their more conservative or non-conservative behaviour. Overall, the reported results will help to optimise the use of fluorescent tracers in terrestrial ecosystems and to increase their potential as a cheap and fast tool to gain insights into the fate of pollutants in soils and sediments. © Author(s) 2020. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162775
Appears in Collections: 气候变化与战略
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作者单位: Bork, M., Soil Ecology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany, Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Lange, J., Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Graf-Rosenfellner, M., Soil Ecology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Lang, F., Soil Ecology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
Recommended Citation:
Bork M.,Lange J.,Graf-Rosenfellner M.,et al. Controls of fluorescent tracer retention by soils and sediments[J]. Hydrology and Earth System Sciences,2020-01-01,24(2)