Water solubility enhancement of pyrene in the presence of humic substances

Tanaka, Shunitz; Oba, Kiyoshi; Fukushima, Masami; Nakayasu, Ken; Hasebe, Kiyoshi

doi:10.1016/s0003-2670(96)00422-9

Cited by 66 publications

(58 citation statements)

References 20 publications

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“…In addition, peaks at 6.5 -7 ppm corresponding to aromatic protons in DB were not observed in the spectrum of FA-SUR. In the solid-state CPMS 13 C NMR spectra (Fig. 4), the largest peak at 30 ppm for DB corresponding to a methyl carbon adjacent to a nitrogen atom was also not seen in the spectrum of FA-SUR.…”

Section: Influences Of Solution Conditions On the Formation Of Precipmentioning

confidence: 94%

“…Fractionation using cationic surfactant. The FA in the acidic supernatant (pH 1) from the alkaline extract of peat soil (600 13 C NMR spectra indicated that the higher oxygen content of the FA-SUR could be due to alcoholic hydroxyl groups and polysaccharides as well as carboxylic groups. These results show that FA-SUR is more polar and hydrophilic than FA-DAX.…”

Section: Methodsmentioning

confidence: 99%

“…The solid-state CPMS 13 C NMR spectra of DB and FAs were acquired on a Chemagnetics CMX-300 spectrometer, equipped with a 5 mm CPMS probe. A 20 mg portion of powdered sample of FA was packed into a 5-mm zirconium rotor.…”

Section: Analyses Of Fasmentioning

confidence: 99%

“…Based on these investigations, the separation and purification procedures of FA-SUR were established. To determine whether any DB remained in the separated and purified FA-SUR or not, 1 H NMR and solid-state CPMS 13 C NMR spectra of FA-SUR were compared with those of DB. Figure 3 shows 1 H-NMR spectra of FA-SUR and DB.…”

Section: Influences Of Solution Conditions On the Formation Of Precipmentioning

confidence: 99%

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Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant

et al. 2006

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Section: Influences Of Solution Conditions On the Formation Of Precipmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Analyses Of Fasmentioning

confidence: 99%

Section: Influences Of Solution Conditions On the Formation Of Precipmentioning

confidence: 99%

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Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant

et al. 2006

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“…Terrestrial humic material, deriving mainly from decay of lignin-containing plants, is thought to account for most of the humic substances present in these systems (Ehrhardt, 1984;Tremblay and Gagné, 2009). Among various important characteristics, HS have been shown to enhance solubility of organic pollutants and pesticides (Chiou et al, 1986;Tanaka et al, 1997;Blasioli et al, 2008); stimulate growth rate and biomass production of dinoflagellates (Doblin et al, 1999;Gagnon et al, 2005); and provide an energy source for a variety of estuarine sedimentary microorganisms under both aerobic and anaerobic conditions (Alberts and Filip, 1994;Rocker et al, 2012). Similar to DOM, the behaviour of HS during transport to the marine environment is still very unclear (Dittmar and Kattner, 2003).…”

Section: Introductionmentioning

confidence: 99%

Annual cycle of humic substances in a temperate estuarine system affected by agricultural practices

Waeles

Riso

Pernet-Coudrier

et al. 2013

Geochimica et Cosmochimica Acta

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, et al.. Annual cycle of humic substances in a temperate estuarine system affected by agricultural practices. Geochimica et Cosmochimica Acta, Elsevier, 2013Elsevier, , 106, pp.231-246. 10.1016Elsevier, /j.gca.2012 Annual cycle of humic substances in a temperate estuarine system affected by agricultural practices AbstractAlthough widely studied for their chemical structures and properties (e.g., metal complexation, growth stimulation of planktonic species), humic substances (HS) have been very poorly quantified in fluvial and estuarine waters. In this monthly basis study, we determined HS concentrations (by Adsorptive Square Wave Cathodic Stripping Voltammetry) along the entire river-seawater gradient of the Penzé estuary (NW France), with the aim to characterize the export of these compounds. In this watershed where agricultural activities are predominant, manuring activities were identified as being the main source of dissolved organic carbon (DOC) and HS. HS concentrations varied usually within a narrow range in fluvial waters, i.e., 1.8 ± 0.4 mgC L À1 (150 ± 40 lM), but increased significantly as the first flood of autumn occurred (>4 mgC L À1 in river and upper estuary). At this time, HS accounted for a very high proportion of DOC (>80%). As evidenced by the increasing contribution of HS to DOC, and by the increasing contribution of small colloidal HS species; this autumnal flood increase should be attributed to a greater retention and transformation of organic matter on soils over the hotter, drier, and lighter period preceding the first autumnal flood. In the mixing zone, HS displayed mostly conservative behaviour, although some removals were occasionally observed. Overall, our study suggests that preservation of HS could be relatively important during their transfer across macrotidal temperate estuaries, at least in systems affected by agricultural practices.

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Sorption and Chemical Reactions of PAHs with Dissolved Humic Substances and Related Model Polymers

Kopinke

Georgi

Mackenzie

2001

Acta hydrochim. hydrobiol.

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Sorption coefficients measured for PAHs on dissolved humic substances by SPME and FQT were found to be inevitably different and method‐dependent – SPME provides activity‐based and FQT concentration‐based sorption coefficients. Poly(acrylic acid) esters as well‐defined model polymers were used in sorption experiments, leading to the conclusion that short aliphatic chains are more effective in binding PAHs than aromatic moieties. FQT was inappropriate to measure sorption coefficients for the interaction of pyrene with poly(acrylic acid) esters but the experiments revealed a characteristic shift in the fluorescence spectrum. Using pyrene as a probe for the molecular environment in the sorbed state, the observed spectral shift indicated a highly hydrophobic microenvironment. The empirical relationships between lg KDOC and lg KOW were generalized on the basis of a modified Flory‐Huggins concept. Introducing only one sorbent‐specific parameter, the solubility parameter δDOM, the calculation of sorption coefficients became possible for a wide range of HOCs using fundamental data readily available from the literature. Long‐term experiments showed that reactive PAHs (such as acenaphthylene and 9‐methylanthracene) are able to react with HAs under strictly abiotic and anoxic conditions, whereas less reactive PAHs (such as naphthalene and dihydroanthracene) do not form bound residues. The HA reveals two functions in the interaction, behaving as a reaction partner and as a protecting ligand.

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Water solubility enhancement of pyrene in the presence of humic substances

Cited by 66 publications

References 20 publications

Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant

Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant

Annual cycle of humic substances in a temperate estuarine system affected by agricultural practices

Sorption and Chemical Reactions of PAHs with Dissolved Humic Substances and Related Model Polymers

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