On the use of a freeze-dried versus an air-dried soil humic acid as a surrogate of soil organic matter for contaminant sorption

Hung, Wei Chia; Lin, Tsair Fuh; Chiu, Chuen Huey; Chiou, Cary T.

doi:10.1016/j.envpol.2011.08.054

Cited by 8 publications

(12 citation statements)

References 16 publications

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“…The log K HS values of Phe sorption on the three size-fractioned HS were 3.97-4.68 L/kg-C. Several studies tested HS extracted from soils and sediments. The organic carbon normalized sorption constants log K HS of Phe sorption on HS ranged from 3.76 to 6.13 [1][2][3]5,6,21,22,34,36,37]. These results are comparable to the sorption constants in this study.…”

Section: Correlation Of Log Khs With Indicatorssupporting

confidence: 86%

“…However, Phe had higher log K HS sorption values onto HHS (4.43 ± 0.21) and MHS (4.41 ± 0.21) than sorption onto LHS (4.04 ± 0.09) (p = 0.015). Several studies [7,12,13,22,24] have reported that the HOCs had a higher sorption capacity onto higher molecular weight DOM because it had a higher aromatic content and higher extent of humification. Although, LHS had a lower log K HS than HHS and MHS.…”

Section: Correlation Of Log Khs With Indicatorsmentioning

confidence: 99%

“…PAHs adsorb onto sediment, soil, and suspended particulate matter [1][2][3]. Moreover, PAHs bind with colloidal DOM isolated from river and seawater as well as humic substances extracted from soil and sediment [4][5][6][7][8][9][10][11][12][13][21][22][23]. One PAH, phenanthrene (Phe), is a moderately hydrophobic compound (the octanol-water partition coefficient, log K OW = 4.57) that favors sorption in sediment HS [1,23].…”

Section: Introductionmentioning

confidence: 99%

“…One PAH, phenanthrene (Phe), is a moderately hydrophobic compound (the octanol-water partition coefficient, log K OW = 4.57) that favors sorption in sediment HS [1,23]. However, the Phe organic carbon-normalized sorption coefficients (log K OC ) show great variation [1][2][3]5,6,11,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, a fluorescence quenching (FQ) method was used to study the sorption behavior of PAHs and HS/DOM [12,13,23,24,28,[33][34][35][36][37], but little attention was given to sediment HS with different molecular weights, especially low-molecular-weight HS (<1 kDa). Furthermore, sediment HS chemical properties and sorption behavior affected by the drying processes (air-drying (AD) and freeze drying (FD)) have been less studied [22].…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence of Size-Fractioned Humic Substance Extracted from Sediment and Its Effect on the Sorption of Phenanthrene

Shi

Huang

Hsu

et al. 2019

IJERPH

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Phenanthrene (Phe) is a toxin and is ubiquitous in the environment. The sediment humic substances (HS) that bind Phe affect the fate, transport, degradation, and ecotoxicology of Phe. This study investigated Phe sorption constants on size-fractioned HS extracted from river sediment. Fractions were identified as HHS (10 kDa to 0.45 µm), MHS (1-10 kDa), and LHS (<1 kDa). A fluorescence quenching (FQ) method was used to determine the Phe log K HS on size-fractioned HS; the values ranged from 3.97 to 4.68 L/kg-C. The sorption constant (log K HS ) is a surrogate of the binding capacity between HS and Phe, where a high log K HS reduces the toxicity and degradation of Phe. The log K HS values on HHS and MHS were significantly higher than the values on LHS (p = 0.015). The SUVA 254 values of HHS and MHS were also significantly higher than the LHS value (p = 0.047), while fluorescence index (FI) and S 275-295 values were significantly lower than the LHS values (p < 0.005). The HHS and MHS had a higher aromaticity and more terrestrial sources than LHS. The log K HS had a significant correlation with the selected optical indicators (p < 0.002), which suggested that the HS-bound Phe was positively affected by high aromaticity, terrestrial sources, and HS molecular weight. The results demonstrated that optical methods successfully obtained log K HS and the chemical properties of fractioned HS as well as the influenced factors of log K HS . Moreover, even the LHS had a capacity to bind with Phe.

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