An Isotope Exchange Technique to Assess Mechanisms of Sorption Hysteresis Applied to Naphthalene in Kerogenous Organic Matter

2005 ◽  
Vol 39 (19) ◽  
pp. 7476-7484 ◽  
Author(s):  
Michael Sander ◽  
Joseph J. Pignatello
Keyword(s):  
Organic Matter ◽  
Isotope Exchange ◽  
Sorption Hysteresis ◽  
Exchange Technique

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.

Ion-exchange technique (IET) for measuring Cu2+, Ni2+ and Zn2+ activities in soils contaminated with metal mixtures

2017 ◽  
Vol 14 (1) ◽  
pp. 55 ◽  
Author(s):  
D. M. Schwertfeger ◽  
W. H. Hendershot
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Metal Binding ◽  
Mean Squared Error ◽  
Metal Speciation ◽  
Ion Exchange Resin ◽  
Metal Bioavailability ◽  
Soil Extracts ◽  
Metal Mixtures ◽  
Exchange Technique

Environmental contextTerrestrial environments receiving trace metal contaminants are often impacted by more than one metal. This study demonstrates the adaptation of an ion-exchange technique to simultaneously obtain Cu2+, Ni2+ and Zn2+ activities in soil extracts. These measurements can be used to better understand and predict the behaviour and bioavailability of soil metals in metal–mixture contamination scenarios. AbstractReliable estimates of metal speciation are critical for predicting metal bioavailability and the toxicological effects of metal mixtures in the soil environment; however, simultaneous measurements of metal free ion activities in complex matrices pose a challenge. Although speciation models maybe useful, the uncertainty of metal binding to natural organic matter requires that such models be validated with empirical data. In this study, an ion-exchange resin technique (IET) was adapted for the analysis of Cu2+, Ni2+ and Zn2+ in soil extracts. The analysis was performed with three different soil types spiked with single and multiple metal additions to obtain a range of metal concentrations and combinations. Method detection limits of 0.006, 0.04 and 0.05µM for Cu2+, Ni2+ and Zn2+ were achieved. The values obtained by IET were comparable with those estimated by Visual MINTEQ, giving a root mean squared error of 0.21, 0.30 and 0.34 (n=30) for the Cu, Ni and Zn data. The Cu2+ activities obtained by IET were within an order of magnitude of those obtained by a Cu ion-selective electrode, being on average 6-fold greater, with better agreement occurring in samples having lower organic matter contents. The resulting soil metal speciation data revealed that the partitioning of soil Cu to the potentially bioavailable Cu2+ pool differed in the binary mixture with Ni compared with the single-metal Cu treatments. These data can be used to assess metal bioavailability and aid in the interpretation of ecotoxicological effects observed in soils where multiple metals are a concern.

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