State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Rd., Haidian District, Beijing 100085, China.
J Colloid Interface Sci. 2012 Sep 15;382(1):117-22. doi: 10.1016/j.jcis.2012.06.003. Epub 2012 Jun 15.
The aging effects of sorption-desorption of two polycyclic aromatic hydrocarbons (PAHs), that is, phenanthrene and chrysene on different natural organic matters (NOMs), that is, humic acid, fulvic acid, and humins of different sources were studied. Both organic carbon-normalized distribution coefficients (K(oc)) and the reversible desorption fractions (f(rd)) were evaluated. Results showed that aging effects were both sorbent and sorbate specific. With increasing aging duration, K(oc)s of phenanthrene on humins increased, whereas K(oc)s of chrysene did not change significantly. Significant f(rd) declinations over aging times were observed for all the NOMs, which demonstrated the effects of aging on availability of PAHs. Furthermore, the f(rd) was not only positively correlated with the atomic O/C ratio of NOMs, which represent the geological maturity of NOMs, but also varied with the property of sorbates. We conclude that aging effects of HOCs on NOMs should be a case-specific process and the desorption reversibility depends on the structure and characteristics of both NOMs and sorbates.
研究了两种多环芳烃（PAHs），即菲和䓛在不同天然有机物（NOMs），即腐殖酸、富里酸和不同来源胡敏素上的吸附-解吸的老化效应。评估了有机碳归一化分配系数（Koc）和可还原解吸分数（frd）。结果表明，老化效应在吸附剂和吸附质两方面都是特异性的。随着老化时间的增加，菲在胡敏素上的 Koc 增加，而䓛的 Koc 没有明显变化。所有 NOMs 的 frd 都随着老化时间显著下降，这表明老化对 PAHs 的可用性有影响。此外，frd 不仅与 NOMs 的原子 O/C 比呈正相关，代表 NOMs 的地质成熟度，而且还随吸附质的性质而变化。我们得出结论，HOCs 对 NOMs 的老化效应应该是一个特定案例的过程，解吸的可逆性取决于 NOMs 和吸附质的结构和特性。
