The Use of Ion Exchange Membranes for Isotope Analyses on Soil Water Sulfate: Laboratory Experiments

To investigate the potential use of anion exchange membranes (plant root simulator [PRS] probes) for isotope investigations of the soil sulfur cycle, laboratory experiments were performed to examine the sulfate exchange characteristics and to determine the extent of sulfur and oxygen isotope fractio...

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Published inJournal of environmental quality Vol. 37; no. 2; pp. 501 - 508
Main Authors Kwon, Jang‐Soon, Mayer, Bernhard, Yun, Seong‐Taek, Nightingale, Michael
Format Journal Article
LanguageEnglish
Published Madison American Society of Agronomy, Crop Science Society of America, Soil Science Society 01.03.2008
American Society of Agronomy
Subjects
Anion exchange
Anion Exchange Resins
Aquatic ecosystems
Chlorides - analysis
Forest soils
Fractionation
Isotope fractionation
Isotopes
Membranes
Moisture content
Nitrates - analysis
Oxygen isotopes
Oxygen Isotopes - analysis
Probes
Ratios
Resins
Soil Pollutants - analysis
Soil solution
Soil water
Studies
Sulfates
Sulfates - analysis
Sulfur
Sulfur cycle
Sulfur Isotopes - analysis
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Summary:To investigate the potential use of anion exchange membranes (plant root simulator [PRS] probes) for isotope investigations of the soil sulfur cycle, laboratory experiments were performed to examine the sulfate exchange characteristics and to determine the extent of sulfur and oxygen isotope fractionation during sulfate sorption and desorption on the probes in aqueous solutions and simulated soil solutions. The sulfate‐exchange tests in aqueous solutions under varying experimental conditions indicated that the amount of sulfate exchanged onto PRS probes increased with increasing reaction time, initial sulfate concentration, and the number of probes used (= surface area), whereas the percentage of removal of available sulfate was constant irrespective of the initial sulfate concentration. The competition of nitrate and chloride in the solution lowered the amount of exchanged sulfate. The exchange experiments in a simulated soil under water‐saturated and water‐unsaturated conditions showed that a considerable proportion of the soil sulfate was exchanged by the PRS probes after about 10 d. There was no evidence for significant sulfur and oxygen isotope fractionation between soil sulfate and sulfate recovered from the PRS probes. Therefore, we recommend the use of PRS probes as an efficient and easy way to collect soil water sulfate for determination of its isotope composition.
Bibliography:All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher.
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ISSN:0047-2425
1537-2537
1537-2537
DOI:10.2134/jeq2007.0174