Influence of methanol on retention of hydrophobic organic chemicals in soil leaching column chromatography.
The influence of methanol in methanol-water mixed eluents on the capacity factor (k'), an important parameter which could depict leaching potential of hydrophobic organic chemicals (HOCs) in soil leaching column chromatography (SLCC), was investigated. Two reference soils, GSE 17201 obtained from Bayer Landwirtschaftszentrum, Monheim, Germany and SP 14696 from LUFA, Spencer, Germany, were used as packing materials in soil columns, and isocratic elution with methanol-water mixtures at different volume fractions of methanol (phi) were tested. Short-term exposure of the column (packed with the GSE 17201 soil) to the eluents increased solute retention by a certain (23% log-unit) degree evaluated through a correlation with the retention on the same soil column but unpreconditioned by methanol-containing eluents. Long-term exposure of soil columns to the eluents did not influence the solute retention. A log-linear equation, log k' = log k'(w) - S(phi), could well and generally describe the retention of HOCs in SLCC. For the compounds of homologous series, logk'(w) had good linear relationship with S, indicating the hydrophobic partition mechanism existing in the retention process.
Xu
Feng
F
Dalian Institute of Chemical Physics, Chinese Academy of Sciences. fengxu64@hotmail.com
Liang
Xinmiao
X
Lin
Bingcheng
B
Su
Fan
F
Schramm
Karl-Werner
KW
Kettrup
Antonius
A
D002845:Chromatography / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods; D000432:Methanol / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis*; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D012997:Solvents / Q000737:chemistry*
D009930:Organic Chemicals; D012989:Soil Pollutants; D012997:Solvents; D000432:Methanol