“…One approach to understand sources and fate mechanisms of OM accumulated in sediments and soils is to utilize a molecular organic geochemical method, where n-alkanes, pristane (Pr), phytane (Ph), the unresolved complex mixture (UCM), alkylated polycyclic aromatic hydrocarbons (PAHs), hopane and sterane are used for the source identification of the OM (Yunker et al, 2002b;Kimbrough and Dickhut, 2006;Wang et al, 2006;Hu et al, 2009;Tolosa et al, 2009;Wang et al, 2011). These biomarkers, combined with total organic carbon (TOC), total nitrogen (TN), the soils can provide robust and powerful proxies for the distinguishing of the OM contributions from natural or anthropogenic sources (Wang et al, 2003;Tanner et al, 2010).…”