Accepted and revised in L157-160. Common topological indices, such as κ shape indices and information indices were also calculated by Molconn-Z (version 4.12S, eduSoft, La Jolla, CA). The detailed list and definitions can be found in the software user’s guide [35], and the definitions can also be found in Todeschini et al. [36]. The results of other common topological indices calculated by Molconn-Z were shown below as well. But in this study, only the steric index (R2 = 0.82 for CN soil; R2 = 0.86 for FN soil) and IDWbar (R2 = 0.83 for CN soil; R2 = 0.94 for FN soil) have a better relationship with the half lives of the isomers, which were mentioned in the Results and Discussion part. The results of the topological indices of the isomers [35] Hall, L. H.; Kellogg, G. E.; Haney, D. N. (2008). Software Package for Molecular Topology Analysis User’S Guide. [36] Todeschini, R.; Consonni, V.; Mannhold, R.; Kubinyi, H.; Folkers, G. (2009). Molecular Descriptors for Chemoinformatics; Wiley: New York.
If the soil was 2 mm-sieved, the extraction of the NP was more inappropriate.