کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4424693 | 1619212 | 2012 | 5 صفحه PDF | دانلود رایگان |

The sorption of phenanthrene (PHN) to relatively pure soil humic acids (HAs) was investigated to assess the suitability of the soil HA as a surrogate sorbent for the soil organic matter (SOM). The HAs were prepared in both freeze-dried and air-dried forms. The two forms of HAs from the same source are similar in composition but the freeze-dried HAs exhibit a significantly higher initial surface area (SA) (3.86–4.59 m2/g); the SAs of air-dried HAs are below 0.1 m2/g. However, the SAs of freeze-dried HAs are not stable upon contact with water; the samples lose practically all the SA after 4 days of immersion in water. The PHN sorption to both forms of HAs is practically linear, whether a co-solute is present or not. The sorption linearity observed with the present freeze-dried HAs is in sharp contrast with the allegedly nonlinear PHN sorption on similar freeze-dried HAs as presented by others.
► In contrast to the alleged nonlinear sorption of a nonpolar organic pollutant to a freeze-dried humic acid (HA) from water.
► This study shows no evidence for such nonlinearity.
► The initially prepared freeze-dried HA exhibits a significant surface area.
► This artificially created surface area is however unstable upon contact with water.
Journal: Environmental Pollution - Volume 160, January 2012, Pages 125–129