Role of the free metal ion species in soluble nickel removal by activated sludge

1984 ◽  
Vol 18 (11) ◽  
pp. 883-886 ◽  
Author(s):  
Jeppe S. Nielsen ◽  
Steve E. Hrudey ◽  
Frederick F. Cantwell
Keyword(s):  
Activated Sludge ◽  
Metal Ion ◽  
Nickel Removal ◽  
Ion Species ◽  
Free Metal ◽  
Free Metal Ion

Prediction of Soluble Nickel Removal by Activated Sludge Using Free Metal Ion Concentrations

1987 ◽  
Vol 19 (3-4) ◽  
pp. 439-448 ◽  
Author(s):  
Jeppe S. Nielsen ◽  
Steve E. Hrudey ◽  
Frederick F. Cantwell
Keyword(s):  
Activated Sludge ◽  
Metal Ion ◽  
Municipal Sewage ◽  
Nickel Ion ◽  
Ion Concentrations ◽  
Untreated Sewage ◽  
Nickel Uptake ◽  
Nickel Removal ◽  
Free Metal ◽  
Free Metal Ion

Batch isotherm studies using spiked sewage samples containing a range of total soluble nickel concentrations typical of municipal sewage strongly suggested that it is the free (i.e. uncomplexed) nickel ion that is sorbed by activated sludge. Equations relating nickel uptake by activated sludge to free nickel ion concentrations and the extent of complexation in untreated sewage were developed and applied. Predicted and measured nickel removals generally agreed to within ± 30%.

Free metal ion availability is a major factor for tolerance and growth in Physcomitrella patens

2015 ◽  
Vol 110 ◽  
pp. 1-10 ◽  
Author(s):  
Stefan Sassmann ◽  
Wolfram Adlassnig ◽  
Markus Puschenreiter ◽  
Edwin Julio Palomino Cadenas ◽  
Mario Leyvas ◽  
...  
Keyword(s):  
Metal Ion ◽  
Physcomitrella Patens ◽  
Free Metal ◽  
Free Metal Ion

Effects of reactive gas addition on ionization of metal atoms in droplet-free metal ion sources

2007 ◽  
Vol 201 (15) ◽  
pp. 6655-6659 ◽  
Author(s):  
Keiji Nakamura ◽  
Akira Wakayama ◽  
Ken Yukimura
Keyword(s):  
Metal Ion ◽  
Ion Sources ◽  
Metal Atoms ◽  
Free Metal ◽  
Free Metal Ion ◽  
Reactive Gas

Prediction of free metal ion activity in contaminated soils using WHAM VII, baker soil test and solubility model

Chemosphere ◽  
2020 ◽  
Vol 243 ◽  
pp. 125408 ◽  
Author(s):  
Debasis Golui ◽  
S.P. Datta ◽  
B.S. Dwivedi ◽  
M.C. Meena ◽  
V.K. Trivedi
Keyword(s):  
Contaminated Soils ◽  
Metal Ion ◽  
Soil Test ◽  
Ion Activity ◽  
Solubility Model ◽  
Free Metal ◽  
Free Metal Ion

scholarly journals Determination of the free-ion concentration of rare earth elements by an ion-exchange technique: implementation, evaluation and limits

2016 ◽  
Vol 13 (3) ◽  
pp. 478 ◽  
Author(s):  
Sébastien Leguay ◽  
Peter G. C. Campbell ◽  
Claude Fortin
Keyword(s):  
Ion Exchange ◽  
Natural Organic Matter ◽  
Metal Ion ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Ion Concentration ◽  
Free Ion ◽  
Free Metal ◽  
Free Metal Ion ◽  
Exchange Technique

Environmental context The lanthanides are a group of heavy elements (from lanthanum to lutetium) increasingly used in many electronic consumer products and little is known about their environmental mobility and toxicity. In natural systems, these elements will bind to natural organic matter but metal toxicity is usually defined by the free metal ion concentration. Here, we propose a method based on sample equilibration with an ion-exchange resin to measure the free lanthanide ion concentration in the presence of natural organic matter. Abstract An ion-exchange technique that employs a polystyrene sulphonate ion-exchange resin was developed for determining environmentally relevant free-ion concentrations of Ce, Eu, La and Nd. Owing to the high affinity of rare earth elements (REE) for the selected resin, this method requires the addition of an inert salt to increase the concentration of the counter-ions (i.e. cations that are exchanged with REE bound to the resin). The use of a batch equilibration approach to calibrate the resin allowed the implementation of the ion-exchange technique at reasonably low ionic strength (I = 0.1M). Several ligands were used to test the selectivity of the method, which proved to be highly selective for the free metal ion in presence of the tested cationic and anionic complexes (REE–nitrate, REE–malic acid and REE–nitrilotriacetic acid systems) and operational for very low proportions of REE3+, owing to the strong REE–resin interactions. The ion-exchange technique was also implemented to determine [Eu]inorg in the presence of natural humic matter (Suwannee River Humic Acid) and the results were compared with those obtained using equilibrium dialysis and those calculated with chemical equilibrium models. At pH 4.00, the measured [Eu]inorg values were in fairly good agreement with those predicted with the Windermere Humic Aqueous Model and Stockholm Humic Model, whereas the Non-Ideal Competitive Absorption model appeared to underestimate the [Eu]inorg. However, the inorganic europium concentrations were strongly underestimated (4 < [Eu]inorg, IET/[Eu]inorg, calc < 18) with the three prediction models at higher pH (5.3 and 6.2).

scholarly journals Chelate-free metal ion binding and heat-induced radiolabeling of iron oxide nanoparticles

2015 ◽  
Vol 6 (1) ◽  
pp. 225-236 ◽  
Author(s):  
Eszter Boros ◽  
Alice M. Bowen ◽  
Lee Josephson ◽  
Neil Vasdev ◽  
Jason P. Holland
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Oxide Nanoparticles ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Free Metal ◽  
Free Metal Ion

Holland and co-workers report details of a novel chelate-free reaction for radiolabeling of pre-fabricated nanoparticles using different radionuclides.

Ion Exchange Complexing Resins as Sensors for the Determination of Free Metal Ion Concentration at a Low Level

2008 ◽  
Vol 26 (3) ◽  
pp. 301-320 ◽  
Author(s):  
Maria Pesavento ◽  
Antonella Profumo ◽  
Raffaela Biesuz ◽  
Giancarla Alberti
Keyword(s):  
Ion Exchange ◽  
Metal Ion ◽  
Ion Concentration ◽  
Low Level ◽  
Free Metal ◽  
Free Metal Ion

scholarly journals Metal speciation and bioavailability: revisiting the 'big questions'

2009 ◽  
Vol 6 (4) ◽  
pp. 290 ◽  
Author(s):  
Janet G. Hering
Keyword(s):  
Metal Ion ◽  
Environmental Chemistry ◽  
Metal Speciation ◽  
Environmental Context ◽  
Metal Stress ◽  
Metal Species ◽  
Sufficient Information ◽  
Analytical Approaches ◽  
Free Metal ◽  
Free Metal Ion

Environmental context. Four decades of research on metal speciation and bioavailability have failed to answer the ‘big questions’ of the ecological consequences of metal stress. Important, though still insufficient, insights have been gained from analytical approaches derived from inorganic environmental chemistry (targeting the quantification of free metal ion or ‘labile’ metal concentrations) and from organic environmental chemistry (focusing on the structure of ambient metal species). The ‘omics’ approach, not yet widely applied to this topic, offers the possibility of providing sufficient information to identify a quantitative signature of metal stress.

Determination of Free Metal Ion Concentrations Using Bioassays

1981 ◽  
Vol 38 (8) ◽  
pp. 999-1002 ◽  
Author(s):  
Uwe Borgmann
Keyword(s):  
Metal Toxicity ◽  
Metal Ion ◽  
Natural Waters ◽  
Complexing Agent ◽  
Aquatic Life ◽  
Ion Concentrations ◽  
Complexing Capacity ◽  
Before And After ◽  
Free Metal ◽  
Free Metal Ion

A procedure was developed by which free metal ion concentrations, toxic to aquatic life, can be calculated by comparing metal toxicity before and after addition of a complexing agent of known complexing capacity. Application of this method suggests that the growth of freshwater copepods is affected at free copper concentrations around 10−10 to 10−9 mol∙L−1. In natural waters, with unidentified ligands of unknown complexing ability, this procedure provides the only method currently available for estimating free metal concentrations at the low levels often causing sublethal toxicity to aquatic organisms.Key words: metal toxicity, complexation, free metal, copepods, copper

Free-metal ion depletion by "Good's" buffers

Science ◽  
1983 ◽  
Vol 221 (4612) ◽  
pp. 749-750 ◽  
Author(s):  
R Nakon ◽  
C. Krishnamoorthy
Keyword(s):  
Metal Ion ◽  
Free Metal ◽  
Free Metal Ion ◽  
Ion Depletion
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