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Phosphorous speciation and solubility in aeolian dust deposited in the interior American West
Zhuojun Zhang; Harland L. Goldstein; Richard L. Reynolds; Yongfeng Hu; Xiaoming Wang; Mengqiang Zhu
2018
Source PublicationEnvironmental Science & Technology
Volume52Issue:5Pages:2658-2667
Abstract

Aeolian dust is a significant source of phosphorus (P) to alpine oligotrophic lakes, but P speciation in dust and source sediments and its release kinetics to lake water remain unknown. Phosphorus K-edge XANES spectroscopy shows that calcium-bound P (Ca-P) is dominant in 10 of 12 dust samples (41-74%) deposited on snow in the central Rocky Mountains and all 42 source sediment samples (the fine fraction) (68-80%), with a lower proportion in dust probably because acidic snowmelt dissolves some Ca-P in dust before collection. Iron-bound P (Fe-P, similar to 54%) dominates in the remaining two dust samples. Chemical extractions (SEDEX) on these samples provide inaccurate results because of unselective extraction of targeted species and artifacts introduced by the extractions. Dust releases increasingly more P in synthetic lake water within 6-72 h thanks to dissolution of Ca-P, but dust release of P declines afterward due to back adsorption of P onto Fe oxides present in the dust. The back sorption is stronger for the dust with a lower degree of P saturation determined by oxalate extraction. This work suggests that P speciation, poorly crystalline minerals in the dust, and lake acidification all affect the availability and fate of dust-borne P in lakes.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8716
Collection环境地球化学国家重点实验室
Affiliation1.Department of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming 82071, United States
2.Geosciences and Environmental Change Science Center, U.S. Geological Survey, Denver, Colorado 80225, United States
3.Canadian Light Source Incorporated, University of Saskatchewan, Saskatoon, Saskatchewan S7N 2V3, Canada
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
5.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Zhuojun Zhang,Harland L. Goldstein,Richard L. Reynolds,et al. Phosphorous speciation and solubility in aeolian dust deposited in the interior American West[J]. Environmental Science & Technology,2018,52(5):2658-2667.
APA Zhuojun Zhang,Harland L. Goldstein,Richard L. Reynolds,Yongfeng Hu,Xiaoming Wang,&Mengqiang Zhu.(2018).Phosphorous speciation and solubility in aeolian dust deposited in the interior American West.Environmental Science & Technology,52(5),2658-2667.
MLA Zhuojun Zhang,et al."Phosphorous speciation and solubility in aeolian dust deposited in the interior American West".Environmental Science & Technology 52.5(2018):2658-2667.
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