Determination of the free ion concentration of trace metals in soil solution using a soil column Donnan membrane technique

2001 ◽  
Vol 52 (4) ◽  
pp. 629-637 ◽  
Author(s):  
L. Weng ◽  
E. J. M. Temminghoff ◽  
W. H. Van Riemsdijk
Keyword(s):  
Trace Metals ◽  
Soil Solution ◽  
Soil Column ◽  
Ion Concentration ◽  
Membrane Technique ◽  
Free Ion ◽  
Donnan Membrane Technique

Determination of the chemical speciation of trace metals in aqueous systems by the Wageningen Donnan Membrane Technique

2000 ◽  
Vol 417 (2) ◽  
pp. 149-157 ◽  
Author(s):  
Erwin J.M. Temminghoff ◽  
Alexandra C.C. Plette ◽  
Rein Van Eck ◽  
Willem H. Van Riemsdijk
Keyword(s):  
Trace Metals ◽  
Chemical Speciation ◽  
Aqueous Systems ◽  
Membrane Technique ◽  
Donnan Membrane Technique

Strategies in the application of the Donnan membrane technique

2011 ◽  
Vol 8 (5) ◽  
pp. 466 ◽  
Author(s):  
Liping Weng ◽  
Flora Alonso Vega ◽  
Willem H. Van Riemsdijk
Keyword(s):  
Ion Concentration ◽  
Accumulation Factor ◽  
Analytical Technique ◽  
Ion Concentrations ◽  
Icp Ms ◽  
Membrane Technique ◽  
Free Ion ◽  
Cell Measurement ◽  
Donnan Membrane Technique ◽  
Measurement Strategies

Environmental context Free ion concentrations determine the effects of nutrients and pollutants on organisms in the environment. The Donnan membrane technique provides a measure of free ion concentrations. This paper presents clear guidelines on the application of the Donnan membrane technique for determining free ion concentrations in both synthetic and natural samples. Abstract The Donnan membrane technique (DMT) can be applied to measure free ion concentrations both in laboratory and in situ in the field. In designing DMT experiments, different strategies can be taken, depending on whether accumulation is needed. (1) When the free ion concentration is above the detection limit of the analytical technique (e.g. ICP-MS), no accumulation is needed and no ligand is added to the acceptor. Measurement can be based on the Donnan membrane equilibrium. (2) When an accumulation of less than 500 times is needed, an appropriate amount of ligand can be added to the acceptor and measurement can be based on the Donnan membrane equilibrium. (3) When an accumulation factor of larger than 500 times is needed, a relatively large amount of ligand is added to the acceptor and measurement can be based on the transport kinetics. In this paper, several issues in designing the DMT experiments are discussed: choice of DMT cell, measurement strategies and ligands and possible implication of slow dissociation of metal complexes in the sample solution (lability issue). The objective of this paper is to give better guidance in the application of DMT for measuring free ion concentrations in both synthetic and natural samples.

scholarly journals Pengaruh Konsentrasi Surfaktan Campuran (Span 80 dan Span 20) dan Rasio Volume Emulsi/Fasa Eksternal terhadap Ekstraksi Ion Kadmium (Cd) Menggunakan Teknik Emulsi Membran Cair

2018 ◽  
Vol 7 (4) ◽  
pp. 210
Author(s):  
Alif Hidayatullah Amin ◽  
Baharuddin Hamzah ◽  
Purnama Ningsih
Keyword(s):  
Phase 1 ◽  
Volume Ratio ◽  
Ion Concentration ◽  
Extraction Percentage ◽  
Ion Extraction ◽  
Internal Phase ◽  
Membrane Technique ◽  
External Phase ◽  
Span 80

Research on the extraction of cadmium(II) ion has been performed using the emulsion liquid membrane technique. This research used laboratory experimental method using benzoyl acetone as a carrier, kerosene as a membrane, nitric acid solution as an internal phase, span 80 and span 20 as a surfactant, and cadmium(II) solution as a sample. The present study was conducted to determine the optimum conditions of cadmium(II) ion extraction in solutions comprising variations in surfactant concentration of spans 80 and span 20 mixtures (1.5–3.5%) and variations in the ratio of emulsion/external phase (1:5–1:7). Determination of remaining of cadmium(II) ion concentration in the sample was analyzed using UV-Vis spectrophotometer at 519 nm wavelength. The results showed that the concentration of mixed surfactants (span 80 and span 20) which resulted in a maximum percent of extraction was 2.5% with 60.11% extraction percentage. In addition, the volume ratio of the emulsion/external phase gave a maximum extraction percentage at a ratio of 1:5.5 with an extraction percent of 78.03%.

scholarly journals A method to determine the soil-solution distribution coefficients and the concentrations for the free ion and the complexes of trace metals: Application to cadmium

Geoderma ◽  
2019 ◽  
Vol 346 ◽  
pp. 91-102
Author(s):  
André Schneider ◽  
Van Xuan Nguyen ◽  
Yoann Viala ◽  
Valentin Violo ◽  
Jean-Yves Cornu ◽  
...  
Keyword(s):  
Trace Metals ◽  
Soil Solution ◽  
Distribution Coefficients ◽  
Free Ion

scholarly journals Penentuan Kondisi Optimasi Transpor Ion Cu (Ii) Melalui Teknik Membran Cair Fasa Ruah Secara Simultan Dengan Oksin Sebagai Pembawa

2015 ◽  
Vol 4 (2) ◽  
pp. 48
Author(s):  
Refinel ◽  
Admin Alif ◽  
Rizki Octarini
Keyword(s):  
Optimum Condition ◽  
Kinetic Analysis ◽  
Liquid Membrane ◽  
Ion Concentration ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
H2so4 Concentration ◽  
Membrane Technique ◽  
Carrier Transportation

 ABSTRACT Determination of optimum condition and kinetic analysis Cu (II) iontransport by simultaneous bulk liquid membrane has been studied. Optimum condition for resource phase with Cu (II) ion concentration as 3,147 x 10-4 M obtained at pH 3 receiving phase with H2SO4 concentration 0,15 M and transport time as long as 3 hours through chloroform membrane using oxine 17,5 x 10-4 M as carrier. Transportation rate of Cu (II) ion decided by comparasion changer-over rest concentration in resource phase Rs and transpoted to receiving phase Rp and then monitored by Atomic Adsorbtion Spectrophotometre (AAS). Kinetic of transport Cu (II) ion process by simultaneous bulk liquid membrane technique fulfil irreversible consecutive first order reaction with transport Cu (II) ion gave (k1) value as 0,0442 minute-1 and ( k1 ) 0,0372 minute-1 . Simultaneous bulk liquid membrane method can be the alternative method in the determination of optimum condition and kinetic analysis of metal ions transport. Key words: Cu (II) ion, kinetic, optimum, transport, liquid membrane, simultaneous    

Fluctuations of Annual Precipitation and Water Resources Quality in Ukraine

2016 ◽  
Vol 10 (4s) ◽  
pp. 621-629
Author(s):  
Valentina Pidlisnyuk ◽  
◽  
John Harrington JR ◽  
Yulia Melnyk ◽  
Yuliya Vystavna ◽  
...  
Keyword(s):  
Water Resources ◽  
Surface Waters ◽  
Precipitation Amount ◽  
Ion Concentration ◽  
Annual Precipitation ◽  
Resource Quality ◽  
Phosphate Ion ◽  
Regional Trends

The article focuses on examining the influence of fluctuations in annual precipitation amount on the quality of surface waters. Water quality was estimated with data on BOD, COD and phosphate–ion concentration within five selected regions of Ukraine. Analysis of the precipitation data (1991 – 2010) showed different regional trends. Using the statistics, determination of the interconnection between precipitation amount and water resources quality were done. The obtained regularities and associated uncertainties can be used for prediction of changes in water resource quality and as a guide for future adaptation to possible climate change.

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