Sorption of Polycyclic Aromatic Compounds to Humic Acid As Studied by High-Performance Liquid Chromatography

Nielsen, Torben; Siigur, Katrin; Helweg, Christian; Jørgensen, Ole A; Hansen, Poul Erik; Кирсо, У.

doi:10.1021/es960620t

Cited by 66 publications

(48 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The kaolinite to date indicate that NHC (e.g., quinoline) sorption on was dispersed for size fractionation by adjusting suspension soils (Zachara et al, 1986(Zachara et al, , 1987 and humic substances pH to 9.5 with dropwise addition of LiOH. The suspension (Nielsen et al, 1997) is affected significantly by solution was size fractionated by centrifugation, and particles with equivalent settling diameters Ͼ2 m were discarded. The suspension was flocculated by addition of concentrated LiCl solu-tion and HCl to give a suspension concentration of 1.0 mol mg kg Ϫ1 while stirring.…”

Section: A Broad Group Of Environmental Contaminantsmentioning

confidence: 99%

Quinoline Sorption on Kaolinite–Humic Acid Complexes

Chorover

Amistadi

Burgos

et al. 1999

Soil Science Soc of Amer J

View full text Add to dashboard Cite

ABSTRACTpH and compound ionization. In contrast to the case for neutral PACs, an equilibrium partition model, whereby Adsorption of quinoline (pK a ϭ 4.92) and background electrolyteNHCs sorb in direct proportion to f OC , is not supported with background electrolyte for cation sorption sitesAbove the pK a , sorption is reduced in parallel with (but offset to a may also be a factor. As a result, soil selectivity for man and Morgan, 1993). Whereas the former effect may be significant for the ionized compound, the latter is more likely to influence retention of the neutral species.

show abstract

Section: A Broad Group Of Environmental Contaminantsmentioning

confidence: 99%

Quinoline Sorption on Kaolinite–Humic Acid Complexes

Chorover

Amistadi

Burgos

et al. 1999

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…Industrialized areas, e.g., gasworks and coke manufacturing sites, represent important sources of semisolid tar oil pollutants. Soils and sediments are major sinks of current and historical contaminations with polycyclic aromatic hydrocarbons (PAHs) (Nielsen et al 1997). Heterocyclic compounds containing nitrogen, sulfur, or oxygen heteroatoms (NSO-HET) simultaneously occur with their unsubstituted PAH analogs.…”

Section: Introductionmentioning

confidence: 99%

Some heterocyclic aromatic compounds are Ah receptor agonists in the DR-CALUX assay and the EROD assay with RTL-W1 cells

Hinger

Brinkmann

Bluhm

et al. 2011

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…HAS was found to be a valuable model matrix for determining soil-water partitioning constants Ž . Szabo and Bulman, 1994;Nielsen et al, 1997 . Silica, ODS, and HAS have been used Ž previously for the study of sorption processes of soil contaminants Szecsody and Bales, .…”

Section: žmentioning

confidence: 99%

Facilitated transport of a PAH mixture by a rhamnolipid biosurfactant in porous silica matrices

Noordman¹,

Bruining²,

Wietzes³

et al. 2000

Journal of Contaminant Hydrology

View full text Add to dashboard Cite

Ž. The facilitated transport of a mixture of three polycyclic aromatic hydrocarbons PAH Ž . naphthalene, fluorene, and phenanthrene by a rhamnolipid biosurfactant was determined with silica, octadecyl-coated silica, and humic acid-coated silica columns. The retardation factors for Ž . the contaminants in the absence of rhamnolipid ranged from 1.8 naphthalene with silica to 708 Ž . phenanthrene with octadecyl-coated silica . The retardation factors for phenanthrene were up to eightfold lower in the presence of 500 mgrl rhamnolipid compared to the situation where no rhamnolipid was present. The facilitated transport of the contaminants in the presence of rhamnolipid could be predicted by accounting for sorption, solubilization and admicellar sorption. In the octadecyl-coated matrix, transport of fluorene and phenanthrene was enhanced even in the Ž . presence of sub-micellar solution of rhamnolipid 20 mgrl , showing that adsorbed surfactant reduced the affinity of these compounds to this stationary phase. Linear free-energy relations Ž . LFERs indicated that the matrix-water, micelle-water, and admicelle-water partitioning constants for PAH were correlated with their 1-octanol-water partitioning constants. These correlations were used to simulate the facilitated transport of contaminants of varying hydrophobicity by a surfactant. It was concluded that surfactants have the greatest transport facilitating effect on the more hydrophobic components. The effectiveness of surfactants for enhancing removal of the less Ž . hydrophobic compounds log K -3.4 may considerably be reduced due to admicellar sorption.

show abstract

Sorption of Polycyclic Aromatic Compounds to Humic Acid As Studied by High-Performance Liquid Chromatography

Cited by 66 publications

References 60 publications

Quinoline Sorption on Kaolinite–Humic Acid Complexes

Quinoline Sorption on Kaolinite–Humic Acid Complexes

Some heterocyclic aromatic compounds are Ah receptor agonists in the DR-CALUX assay and the EROD assay with RTL-W1 cells

Facilitated transport of a PAH mixture by a rhamnolipid biosurfactant in porous silica matrices

Contact Info

Product

Resources

About