0428同步年報-2021-全

072 ACTIVITY REPORT 2021 Fig. 1 : FTIR spectra of PAH-contaminated site soil and clean soil as affected by thermal temperature and n -butanol extraction. [Reproduced from Ref. 1] Fig. 3 : Representative chemical maps for the distribution of PAH (aromatic C-H, 3045 cm -1 ), aromatic C=C (1610 cm -1 ), aliphatic C-H (2920 cm -1 ), and clay mineral (O-H, 3621 cm -1 ) within microaggregates from the soil at an industrial site affected by thermolysis at 300 o C analyzed using SR-IMS. Regression analyses were conducted for the hotspot distribution of PAH and soil components based on corresponding chemical maps. The square ( □ ) and circle ( ○ ) legends denote pristine and thermolysis at 300 o C, respectively. [Reproduced from Ref. 1] Fig. 2 : FTIR spectra of selected PAH compounds. [Reproduced from Ref. 1] including aromatic and aliphatic compounds, and clay minerals were revealed to be heterogeneously distributed with a micro-aggregation block in undisturbed soil particles of a soil sample after thermolysis at 300 o C by SR-IMS ( Fig. 3 ). The infrared spectral images for the distribution of PAH were closely correlated with aromatic C, aliphatic C, and clay minerals in pristine soil based on the corresponding characteristic absorption bands ( Fig. 3 ). After thermolysis at 300 o C, the remaining PAH showed a stronger correlation with aromatic C in their lateral distribution in the soils, as indicated by the significantly increased r values. The thermolysis not only distinctly altered the binding sites but also significantly changed the speciation and distribution of organic C in the soils. In this report, carboxylic C displayed a positive correlation with clay minerals in pristine soils; the association was greatly attenuated at 300 o C.