scholarly journals Isotope exchange technique for preparation of hydrogen gas in mass spectrometric D/H analysis of natural waters.

1986 ◽  
Vol 2 (5) ◽  
pp. 489-490 ◽  
Author(s):  
Takashi OHSUMI ◽  
Hiroshi FUJINO
Keyword(s):  
Isotope Exchange ◽  
Natural Waters ◽  
Mass Spectrometric ◽  
Hydrogen Gas ◽  
Exchange Technique

scholarly journals Assessment of labilities of metal complexes with the dynamic ion exchange technique

2019 ◽  
Vol 16 (3) ◽  
pp. 151
Author(s):  
Federico Quattrini ◽  
Josep Galceran ◽  
Carlos Rey-Castro ◽  
Jaume Puy ◽  
Claude Fortin
Keyword(s):  
Ion Exchange ◽  
Natural Waters ◽  
Breakthrough Curves ◽  
Short Exposure ◽  
Metal Bioavailability ◽  
Operation Conditions ◽  
The Impact ◽  
Free Metal ◽  
Metal Ligand ◽  
Exchange Technique

Environmental contextIn natural waters, the impact of metals on biota is modulated by their binding with ligands. Ion-exchange techniques can provide information about metal-ligand complexes in solution, which can be linked to metal bioavailability in natural waters. We investigate modelling approaches to interpreting data from ion-exchange experiments to help elucidate the contribution of a particular complex to the overall metal uptake. AbstractThe dynamic ion exchange technique (DIET) is proposed to provide speciation information, which can be used to establish links with metal bioavailability in natural waters. The experimental setup consists of a few milligrams of a sulfonic acid type ion exchange resin packed in a plastic microcolumn that is coupled to a peristaltic pump for a sample to interact with the resin which is subsequently eluted. The evolution of both the accumulated number of moles in the resin and the concentration of the effluent can provide information on the dissociation of different metal-ligand complexes when compared with the transport properties. This information can be converted into the lability degree of a given complex or the DIET concentration cDIET, which accounts for the labile fraction contributing to the metal accumulation by the resin column at the operation conditions. cDIET can be extended to columns containing chelating resins (such as those with Chelex) or to chromatography. A comprehensive modelling of the involved phenomena (such as diffusion, advection, reaction kinetics and electrostatic partitioning) leads to the quantitative interpretation of the accumulation time series (accumulation curves) or effluent evolution (breakthrough curves). Particularly simple analytical expressions can be used for short exposure times, when a (quasi) steady-state is attained. These models have been checked against the results from complexes of Cu and Ni with ligands, such as ethylenediamine, and ethylenediaminetetraacetic, iminodiacetic, glutamic, salicylic, malonic and malic acids, which yield complexes with contrasting charges. Caution is advised when estimating the free metal fraction from DIET measurements, as cDIET and the free metal concentration can be considered to be equal only in the case of extremely inert complexes.

scholarly journals Kinetic Study on Surface Dissolution of Nitrogen on Liquid Steel by Isotope Exchange Technique

2009 ◽  
Vol 49 (4) ◽  
pp. 487-494 ◽  
Author(s):  
Seung-Min Han ◽  
Joo-Hyun Park ◽  
Sung-Mo Jung ◽  
Jung-Ho Park ◽  
Dong-Joon Min
Keyword(s):  
Kinetic Study ◽  
Liquid Steel ◽  
Isotope Exchange ◽  
Exchange Technique

scholarly journals Interfacial Rate of CO2^|^ndash;CO Reaction with the Solid Iron and Iron Oxide by Isotope Exchange Technique at 1273 K

2012 ◽  
Vol 52 (9) ◽  
pp. 1529-1534 ◽  
Author(s):  
Xiaojun Hu ◽  
Teng Zhang ◽  
Hongyan Yan ◽  
Hiroyuki Matsuura ◽  
Fumitaka Tsukihashi ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Isotope Exchange ◽  
Solid Iron ◽  
Exchange Technique

Applicability of an Isotope Exchange Method for the Determination of Milligram and Microgram Quantities of Organic Mercurials. I. Pharmaceutical and Agricultural Mercurials

1965 ◽  
Vol 48 (6) ◽  
pp. 1134-1138
Author(s):  
Sidney Davis ◽  
Alphonso Arnold
Keyword(s):  
Isotope Exchange ◽  
Mercury Determination ◽  
Exchange Method ◽  
Average Recovery ◽  
Low Levels ◽  
Standard Techniques ◽  
Isotope Exchange Method ◽  
Organic Mercurials ◽  
Exchange Technique

Abstract The isotope exchange technique was applied to the analysis of milligram and microgram quantities of organic mercurials, with emphasis on pharmaceuticals and fungicides of an agricultural nature. Average recovery was 98.48 ± 1.12% for Hg-203 in equilibrium with chemical mercury. In comparison studies, the isotope exchange procedure showed essential agreement with standard techniques for mercury determination. At low levels, traces of mercury via glassware contamination were observed to interfere. The digestion system was found to be applicable to most organic mercurials studied except ethyl mercuric phosphate and three commercial fungicides.

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