scholarly journals The Purification Efficiency of Natural Waters from Ammonium Nitrogen by Natural and Synthetic Cation-Exchange Materials

2016 ◽  
Vol 26 (1) ◽  
pp. 182-185
Author(s):  
O.О. Matsiyevska
Keyword(s):  
Cation Exchange ◽  
Natural Waters ◽  
Ammonium Nitrogen ◽  
Purification Efficiency ◽  
Natural And Synthetic

scholarly journals Free Eu(III) Determination by Donnan Membrane Technique with Electrochemical Detection: Implementation and Evaluation

2021 ◽  
Author(s):  
Noémie Janot ◽  
Jan E. Groenenberg ◽  
Alba Otero-Fariña ◽  
José Paulo Pinheiro
Keyword(s):  
Cation Exchange ◽  
Natural Waters ◽  
Stripping Voltammetry ◽  
Cation Exchange Membrane ◽  
Membrane Technique ◽  
Ligand Free ◽  
Natural Solution ◽  
Pass Through ◽  
Donnan Membrane Technique ◽  
Exchange Membrane

AbstractThe aim of this study was to develop an analytical method to determine free concentrations of Europium (Eu(III)) in natural waters. Europium(III) in solution was detected using cathodic stripping voltammetry after complexation with N-nitroso-N-phenylhydroxylamine (cupferron). Optimization of analytical parameters allowed us to detect nanomolar levels of Eu(III) in solution. Free Eu(III) in solution was measured using the Donnan membrane technique in which a natural solution (the “donor”, containing various ligands) is separated from a ligand-free solution (the “acceptor”) by a cation-exchange membrane. This membrane allows only non-colloidal cationic species to pass through it, and after an adequate time equilibrium is reached between both compartments. Total Eu(III) concentration can then be quantified in the acceptor solution and related to free Eu(III) in the natural sample. Due to its high valency, free Eu(III) tends to adsorb strongly to the cation-exchange membrane. In order to determine the physicochemical conditions minimizing this adsorption, we analyzed solutions of different Eu(III) and Ca(II) (as background ion) concentrations. Results showed that 100 mM of Ca(II) were necessary to make adsorption of Eu(III) onto the membrane negligible. The optimized setup was then used to quantify Eu(III) complexation in a Eu(III)-dissolved organic matter solution.

Speciation of Chromium via Laser-Induced Breakdown Spectroscopy of Ion Exchange Polymer Membranes

2005 ◽  
Vol 59 (2) ◽  
pp. 252-257 ◽  
Author(s):  
Christopher R. Dockery ◽  
Jack E. Pender ◽  
Scott R. Goode
Keyword(s):  
Cation Exchange ◽  
Natural Waters ◽  
Limit Of Detection ◽  
Polymer Membranes ◽  
Solution Concentration ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Chromium Vi ◽  
Laser Induced Breakdown ◽  
The Matrix

A new method for the speciation of ng/mL concentrations of Cr(III) and Cr(VI) solutions with analysis by laser-induced breakdown spectroscopy (LIBS) is reported. Speciation is achieved by pre-concentration of the chromium onto commercially available cation exchange polymer membranes. Chromium(III) is removed directly by cation exchange; chromium(VI) in the filtrate is reduced to Cr(III) and concentrated onto a second cation exchange membrane, affording independent measurement of both species. Large volumes of waters containing Cr(III) and Cr(VI) can be concentrated onto the membranes and directly analyzed by laser-induced breakdown spectroscopy. The estimated limit of detection corresponds to 500 ng of Cr on the membrane: if a solution volume of 1 L is used, then the detection limit corresponds to a solution concentration of 0.5 ng/mL. Excellent separation of the chromium species is attained. Results show that overall method efficiencies range from 94–116% and are independent of the matrix. The influence of pH has been measured, and although Cr(VI) converts to Cr(III) in acidic solutions, the total Cr recoveries are not appreciably influenced by pH over the range of natural waters (4 to 9). In addition, speciation was performed in the presence of a number of different cations and showed that the method is robust in many different and complex matrices.

Flow-injection determination of low levels of ammonium ions in natural waters employing preconcentration with a cation-exchange resin

1992 ◽  
Vol 261 (1-2) ◽  
pp. 339-343 ◽  
Author(s):  
Menezes Santos Filha Marina ◽  
Boaventura Freire dos Reis ◽  
Henrique Bergamin Fo. ◽  
Nivaldo Baccan
Keyword(s):  
Cation Exchange ◽  
Flow Injection ◽  
Natural Waters ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ammonium Ions ◽  
Low Levels

Purification Efficiency of Compound Aquatic Plants for the Eutrophic Water Body

2014 ◽  
Vol 675-677 ◽  
pp. 430-433
Author(s):  
Hong Wang ◽  
Xin Wang ◽  
Shi Man Wang ◽  
Xian Chao Ji
Keyword(s):  
Removal Efficiency ◽  
Aquatic Plants ◽  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Single Species ◽  
Ammonium Nitrogen ◽  
Ceratophyllum Demersum ◽  
Nitrogen And Phosphorus ◽  
Purification Efficiency ◽  
Eutrophic Water

In order to study combination effect of aquatic plants for the purification of eutrophic wastewater, research was carried out in greenhouse with water hyacinth (Eichhornia crassipes), hornwort (Ceratophyllum demersumL) an water milfoil (Myriophyllum verticillatum L). In the treatment of water hyacinth + water milfoil , the removal efficiency of ammonium nitrogen (NH4+-N), nitrite nitrogen (NO3--N) , total nitrogen (TN), total phosphorus (TP) and COD was 74.7%, 61.7%, 65.6%, 73.8% and 50.8% respectively. And that of water hyacinth + hornwort was 79.0%, 52.6%, 67.5%, 46.2% and 56.9%. The combination of different aquatic plants have better removal efficiency than single species. Water milfoil showed good removal ability for the eutrophication pollutants, such as nitrogen and phosphorus, while hornwort was good at the purification of COD.

Effective removal of ammonium nitrogen using titanate adsorbent: Capacity evaluation focusing on cation exchange

2021 ◽  
Vol 771 ◽  
pp. 144800
Author(s):  
Wenlong Zhang ◽  
Zhenyu Wang ◽  
Yunpeng Liu ◽  
Jiangtao Feng ◽  
Jie Han ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Ammonium Nitrogen ◽  
Capacity Evaluation ◽  
Effective Removal ◽  
Adsorbent Capacity

scholarly journals The Application of Cation Exchange Membranes in Electrochemical Systems for Ammonia Recovery from Wastewater

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 494
Author(s):  
Kai Yang ◽  
Mohan Qin
Keyword(s):  
Cation Exchange ◽  
Crucial Role ◽  
Performance Metrics ◽  
Ammonium Nitrogen ◽  
Comprehensive Review ◽  
Electrochemical Systems ◽  
Electrochemical Processes ◽  
Ammonia Recovery ◽  
Exchange Membrane ◽  
Electrochemical Stripping

Electrochemical processes are considered promising technologies for ammonia recovery from wastewater. In electrochemical processes, cation exchange membrane (CEM), which is applied to separate compartments, plays a crucial role in the separation of ammonium nitrogen from wastewater. Here we provide a comprehensive review on the application of CEM in electrochemical systems for ammonia recovery from wastewater. Four kinds of electrochemical systems, including bioelectrochemical systems, electrochemical stripping, membrane electrosorption, and electrodialysis, are introduced. Then we discuss the role CEM plays in these processes for ammonia recovery from wastewater. In addition, we highlight the key performance metrics related to ammonia recovery and properties of CEM membrane. The limitations and key challenges of using CEM for ammonia recovery are also identified and discussed.

scholarly journals Clinoptilolitic Zeolite as an Amendment for Establishment of Creeping Bentgrass on Sandy Media

HortScience ◽  
1991 ◽  
Vol 26 (2) ◽  
pp. 117-119 ◽  
Author(s):  
J.L. NUS ◽  
S.E. Brauen
Keyword(s):  
Particle Size ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Creeping Bentgrass ◽  
Ammonium Nitrogen ◽  
Exchange Capacity ◽  
Particle Sizes ◽  
Agrostis Palustris ◽  
Exchangeable Potassium ◽  
Sphagnum Peat

In a field experiment, clinoptilolitic zeolite was compared to sphagnum peat and sawdust as sand amendments at 5%, 10%, and 209” (v/v) to enhance `Penncross' creeping bentgrass (Agrostis palustris Huds.) establishment and to compare their gravimetric and volumetric cation exchange capacities and their effects on moisture retention and cation exchange capacities of the resultant mixes. In addition, cation exchange capacities and exchangeable K+ and \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document}; were analyzed from clinoptilolitic zeolite of particle sizes ranging from <0.25 mm to >5.0 mm. All amendments, except 10?ZO and 20% sawdust, resulted in superior establishment compared to unamended sand. Peat-amended sand retained significantly more moisture than sawdust- or zeolite-amended sand at –6, –10, –33, and -250 kpa soil matric potentials. Zeolite exhibited a much higher volumetric cation exchange capacity than either sawdust or sphagnum peat. Cation exchange capacity and exchangeable potassium of clinoptilolitic zeolite was greatest when particle size was <0.5 mm; however, little exchangeable ammonium nitrogen was detected.

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