0428同步年報-2021-全

Environmental and Earth Sciences 073 Assessment and Applicability of Bone Char as a Phosphorus Nutrient Source This study has underpinned the systematic changes of bone char and interlinked the charring effect with its dissolution behavior, providing a scientific base to understand the applicability of various bone chars as suitable P-fertilizers. Fig. 1 : Graphical abstract. [Reproduced from Ref. 1] Meanwhile, aromatic C tended to be positively correlated with clay minerals after thermolysis at 300 o C; although, in the temperature range T > 300−500 o C, the correlation appeared to be attenuated and then to disappear at 650 o C. No obvious correlation was observed between aromatic C and aliphatic C in the soil samples. This study revealed for the first time the binding sites of PAH and their associations in the soil as affected by thermolysis at the micrometer level. Through direct examination of the changes in the distribution and transformation of organic C species and clay minerals ( i.e. , the binding sites of PAH) in soil induced by thermolysis, it was confirmed that the temperature of thermolysis controls the desorption efficiency of PAH and that aromatic C plays a critical role in the sequestration and desorption of PAH in soil. The transformed organic carbon speciation can in turn affect the distribution of PAH in treated soils. The bioaccessible fraction of PAH shares the same binding sites in the soils with the fraction that is labile to be desorbed during the thermal treatment; the residual PAH tends to be immobilized mainly within aromatic C in the soils after thermolysis. (Reported by Yao-Chang Lee) This report features the work of Yuan Cheng and his collaborators published in J. Hazard. Mater. 411 , 125129 (2021) TLS 14A1 IR Microscopy • FTIR, Micro-FTIR, Micro-ATR-FTIR, (H)ATR-FTIR, FTIR Imaging • Earth Science, Environmental Science, Life Science, Paleontology, Medical Science, Clinical Chemistry, Materials Science, Chemistry Reference 1. Y. Cheng, H. Sun, E. Yang, J. Lv, B. Wen, F. Sun, L. Luo, and Z. Liu, J. Hazard. Mater. 411 , 125129 (2021). T he applicability of bone char as a long-term phosphorus nutrient source was assessed by integrating their mineral transformation and physicochemical properties with their dissolution behavior. The group of Biqing Liang (National Cheng Kung University) has explored synchrotron-based spectroscopic and imaging techniques, micro Fourier-transform infrared spectroscopy (micro-FTIR) at TLS 14A1 , X-ray diffraction (XRD) at TPS 09A , and transmission X-ray microscopy (TXM) at TLS 01B1 to investigate the physicochemical changes of bone and bone char along a charring temperature gradient (300−1200 °C) and used a laboratory incubation experiment to study their dissolution behavior (bone, bone char at 300, 500 and 700 °C) in solutions of varied pH (4, 6 and 6.9). The thermal decomposition of inorganic carbonate (CO 3 2- ) and the loss of organic components rendered a crystallographic rearrangement (blue shift of the PO 4 3- signal) and mineral transformation with increasing temperature. The mineral transformation from B-type to AB- and A-type carbonate substitution occurred mainly at < 700 °C, whereas the transformation from carbonated hydroxyapatite (CHAp) to more mineralogically and chemically stable HAp occurred at > 800 °C. The loss of inorganic carbonate and