Isolation and Characterization of Different Organic Matter Fractions from a Same Soil Source and Their Phenanthrene Sorption
Isolation and Characterization of Different Organic Matter Fractions from a Same Soil Source and Their Phenanthrene Sorption
复制标题
同一土壤源中不同有机质组分的分离和表征及其菲吸附
DOI：
10.1021/es3052087
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发表时间：
2013-05-21
影响因子：
11.4
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
--
作者：
Sun, Ke;Jin, Jie;Xing, Baoshan
Four humic acids (HAs) including de-ashed HAs (D-HAs) two humins (HMs), nonhydrolyzable carbons, and demineralized fraction (DM) were isolated separately from two soils and characterized detailedly; then their sorption of phenanthrene (Phen) was examined. The sequence of removal of HAs and minerals affected molecular composition of,HMs. After de-ashing, thermal stability of HAs was improved; however, sorption (logK(oc)) also decreased due to removal of amorphous alkyl-C. Significant correlations between CO2 surface area of HAS with their sorption coefficients (n and K-oc) suggested that pore filling could dominate Phen sorption. Alkyl-C could facilitate elevated thermal stability of OM and Phen sorption, supporting that thermal stability of OM was correlated with Phen sorption. The OM fraction composed of aromatic moieties (AMs) did not produce the highest logK(oc), providing strong evidence to dispute the dominant role of AMs in Phen sorption. No correlations between the K-oc values of Phen by all tested sorbents and their bulk or surface polarity were observed, suggesting that the role of bulk or surface polarity of OM fractions in regulating Phen sorption was dependent on soil sources. This work shows the major influence of bulk and surface composition of OM and amorphous alkyl-C isolated from a soil sample on hydrophobic organic compounds sorption.
