DOI: 10.1016/j.watres.2018.03.031
Scopus记录号: 2-s2.0-85046009353
论文题名: In situ sampling and speciation method for measuring dissolved phosphite at ultratrace concentrations in the natural environment
作者: Han C. ; Williams P.N. ; Ren J. ; Wang Z. ; Fang X. ; Xu D. ; Xie X. ; Geng J. ; Ma L.Q. ; Luo J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 137 起始页码: 281
结束页码: 289
语种: 英语
英文关键词: DGT
; High-resolution
; In situ sampling method
; P+III
; Ultra-sensitivity analysis
Scopus关键词: Column chromatography
; Ion chromatography
; Ionic strength
; Desorption efficiency
; Diffusive gradients in thin films
; Global phosphorus cycle
; High resolution
; Laboratory performance
; Quantification limit
; Sampling method
; Sediment water interface
; Sensitivity analysis
; fresh water
; phosphite
; fresh water
; phosphite
; concentration (composition)
; dissolved matter
; environmental fate
; in situ measurement
; numerical method
; optimization
; oxidation
; resolution
; sampling
; sensitivity analysis
; speciation (chemistry)
; aquatic environment
; Article
; chromatography
; desorption
; diffusion
; ionic strength
; laboratory test
; mesocosm
; pH
; priority journal
; procedures
; sediment
; storage
; analysis
; chemistry
; environmental monitoring
; osmolarity
; pollutant
; soil
; waste water
; Environmental Monitoring
; Environmental Pollutants
; Fresh Water
; Osmolar Concentration
; Phosphites
; Soil
; Waste Water
英文摘要: Phosphite (P+III) is of emerging chemical interest due to its importance within the global phosphorus cycle. Yet, to date, precise/accurate measurements of P+III are still lacking due to the inherent analytical challenges linked to its instability/ease of oxidation and ultra-trace concentration. Here, we present the first in-situ sampling and speciation analysis method, for dissolved P+III, using the diffusive-gradients-in-thin-films (DGT) technique, combined with capillary-column-configured-dual-ion-chromatography (CC-DIC). Method optimization of the DGT elution regime, to simultaneously maximize desorption efficiency and CC-DIC sensitivity, along with the characterization of diffusion coefficients for P+III, were undertaken before full method validation. Laboratory-performance testing confirmed DGT-P+III acquisition to be independent of pH (3.0–10.0) and ionic strength (0–500 mM). The capacity for P+III was 45.8 μg cm−2, while neither P+V (up to 10 mg L−1) nor As+V (up to 1 mg L−1) impacted the DGT-P+III measurement. This novel method's functionality stems from the herein confirmed speciation preservation and double pre-concentration of P+III, resulting in quantification limits as low as 7.44 ng L−1 for a 3-day deployment. Applications of this method in various terrestrial/aquatic environments were demonstrated and simultaneous profiles of P+III and P+V across a sediment-water interface were captured at mm resolution in two contrasting redox-mesocosm systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112805
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, BT9 7BL, United Kingdom; Geological Survey of Jiangsu Province, Nanjing, 210018, China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States
Recommended Citation:
Han C.,Williams P.N.,Ren J.,et al. In situ sampling and speciation method for measuring dissolved phosphite at ultratrace concentrations in the natural environment[J]. Water Research,2018-01-01,137