HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Xu, F. Articles by Lin, B. Search for Related Content PubMed PubMed Citation Articles by Xu, F. Articles by Lin, B. GeoRef GeoRef Citation Agricola Articles by Xu, F. Articles by Lin, B. Related Collections Ground Water Quality Water Quality Organic Compounds Soil Pollution Water Pollution

TECHNICAL REPORTS
Organic Compounds in the Environment

Retention Equations of Nonionic Organic Chemicals in Soil Column Chromatography with Methanol–Water Eluents

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 161 Zhongshan Road, Dalian 116011, China

* Corresponding author (liangxm{at}mail.dlptt.ln.cn)

Received for publication November 14, 2001. Research efforts dealing with chemical transportation in soils are needed to prevent damage to ground water. Methanol-containing solvents can increase the translocation of nonionic organic chemicals (NOCs). In this study, a general log-linear retention equation, log k' = log k^'_w - S (Eq. [1]), was developed to describe the mobilities of NOCs in soil column chromatography (SCC). The term denotes the volume fraction of methanol in eluent, k' is the capacity factor of a solute at a certain value, and log k^'_w and -S are the intercept and slope of the log k' vs. plot. Two reference soils (GSE 17204 and GSE 17205) were used as packing materials, and were eluted by isocratic methanol–water mixtures. A model of linear solvation energy relationships (LSER) was applied to analyze the k' from molecular interactions. The most important factor determining the transportation was found to be the solute hydrophobic partition in soils, and the second-most important factor was the solute hydrogen-bond basicity (hydrogen-bond accepting ability), while the less important factor was the solute dipolarity–polarizability. The solute hydrogen-bond acidity (hydrogen-bond donating ability) was statistically unimportant and deletable. From the LSER model, one could also obtain Eq. [1]. The experimental k' data of 121 NOCs can be accurately explained by Eq. [1]. The equation is promising to estimate the solute mobility in pure water by extrapolating from lower-capacity factors obtained in methanol–water mixed eluents.

Abbreviations: LSER, linear solvation energy relationships • NOC, nonionic organic chemical • RPLC, reversed-phase liquid chromatography • SCC, soil column chromatography