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Retention Equations of Nonionic Organic Chemicals in Soil Column Chromatography with Methanol–Water Eluents
Author(s) -
Xu Feng,
Liang Xinmiao,
Lin Bingcheng
Publication year - 2002
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2002.1972
Subject(s) - chemistry , solvation , partition coefficient , hydrogen bond , soil water , methanol , elution , polarizability , column chromatography , chromatography , molecule , organic chemistry , soil science , environmental science
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 φ (Eq. [1]), was developed to describe the mobilities of NOCs in soil column chromatography (SCC). The term φ denotes the volume fraction of methanol in eluent, k ′ is the capacity factor of a solute at a certain φ value, and log k ′ w and − S are the intercept and slope of the log k ′ vs. φ 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.