Selective separation and preconcentration of Th(iv) using organo-functionalized, hierarchically porous silica monoliths

2019 ◽  
Vol 7 (1) ◽  
pp. 289-302 ◽  
Author(s):  
Yimu Hu ◽  
Simon Giret ◽  
Rafael Meinusch ◽  
Jongho Han ◽  
Frédéric-Georges Fontaine ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Flow Separation ◽  
Continuous Flow ◽  
Porous Silica ◽  
Modified Silica ◽  
Silica Monoliths ◽  
Selective Sorbent ◽  
Silica Monolith ◽  
Separation And Preconcentration

Hierarchical macroporous–mesoporous diglycolamide-modified silica monolith used as a selective sorbent for continuous flow separation of Th(iv) from rare earth elements.

Metal–organic complexes as a major sink for rare earth elements in soils

2019 ◽  
Vol 16 (5) ◽  
pp. 323 ◽  
Author(s):  
Petr S. Fedotov ◽  
Olga B. Rogova ◽  
Rustam Kh. Dzhenloda ◽  
Vasily K. Karandashev
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Contaminated Soil ◽  
Continuous Flow ◽  
Chemical Fractionation ◽  
Natural Conditions ◽  
Organic Complexes ◽  
Metal Organic

Environmental contextThe role of rare earth elements in soil–plant systems remains unclear. We use continuous-flow extraction, designed to mimic natural conditions while minimising artefacts, to study in vitro chemical fractionation of rare earth elements in soil. The study reveals a predominant association of rare earth elements and metal-organic complexes independent of soil type and contamination, and thereby provides valuable insights into the behaviour of these elements in soil–plant systems. AbstractThe role of rare earth elements (REEs) in soil–plant systems has attracted increasing attention but still remains somewhat unclear. Along invivo studies on the uptake of REEs by plants, invitro chemical fractionation of REEs in soil according to their physicochemical mobility can offer additional insights into the behaviour of REEs. In the present work, the fractionation of REEs was studied with the example of background, aerially and hydrogenically contaminated soil samples using dynamic (continuous flow) extraction, which allows natural conditions to be mimicked and artefacts to be minimised. The eluents applied addressed exchangeable, specifically sorbed, bound to Mn oxides, bound to metal–organic complexes, and bound to amorphous and poorly ordered Fe/Al oxides fractions extractable by 0.05M Ca(NO3)2, 0.43M CH3COOH, 0.1M NH2OH·HCl, 0.1M K4P2O7 at pH 11, and 0.1M (NH4)2C2O4 at pH 3.2 respectively. The distribution of trace metals (such as Pb, Cu, Zn, Ni) between separated fractions varies with sample and is dependent on the type of contamination. However, for all samples, the recoveries of REEs by pyrophosphate are surprisingly high, up to 40–45% of their total concentrations in background and anthropogenically transformed floodplain soils. As compared to metal–organic complexes, the contents of REEs bound to Fe/Al oxides are fairly low, no more than 12%. REEs in other fractions may be taken into consideration only for aerially contaminated soil. Such a predominant association of REEs and metal–organic complexes (i.e. humic and fulvic compounds) independent of the type of soil has not been reported before.

scholarly journals Development and field test of a mobile continuous flow system utilizing Chemcatcher for monitoring of rare earth elements in marine environments

2016 ◽  
Vol 2 (1) ◽  
pp. 146-153 ◽  
Author(s):  
Jördis Petersen ◽  
Daniel Pröfrock ◽  
Albrecht Paschke ◽  
Jose A. C. Broekaert ◽  
Andreas Prange
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Field Test ◽  
North Sea ◽  
Continuous Flow ◽  
Flow System ◽  
Field Testing ◽  
The Novel ◽  
The North ◽  
The North Sea

Field testing of the novel system during a cruise in the North Sea yielded precise TWA concentrations of the analytes.

scholarly journals Efficient Recovery and Enrichment of Rare Earth Elements by a Continuous Flow Micro-extraction System

2021 ◽  
Author(s):  
Zhuo Chen ◽  
Jifang Yuan ◽  
Yuhang Dong ◽  
Haipeng Liu ◽  
Fuxin Liang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Continuous Flow ◽  
Extraction System ◽  
Efficient Recovery
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