NSRRC Activity Report 2023

078 NSRRC ACTIVITY REPORT 2023 and sorbed Cr concentrations, unlike other samples. Gp and Cm, which exhibited the lowest Cr sorption capacities at both pH levels, demonstrated modifications in PSS indicative of conformational fragility and adaptation to Cr stress. Notably, at pH 2.0, Cm and Cc, with the highest sorption capacities, displayed the common feature of a substantial decrease in the proportion of unordered structures, suggesting intracellular protein proliferation to acclimate to Cr toxicity. In summary, by combining sorption isotherms with synchrotron-related techniques, we investigated the mechanisms of Cr(VI) retention on Cyanidiales under both acidic and neutral conditions. Cm and Gp exhibited remarkable Cr(VI) sorption capacities at pH 2.0 (168.1 mg g -1 ) and pH 7.0 (93.7 mg g -1 ), respectively. In both cases, a significant proportion (89% for Cm at pH 2.0 and 62% for Gp at pH 7.0) of sorbed Cr occurred as Cr(III). The distribution of Cr species varied with sorption capacity, suggesting Cyanidiales employ alternative detoxification processes based on Cr stress intensity. Particularly intriguing was the intracellular formation of Cr(OH) 3 observed only in Cm and Cc when sorbed Cr was ≥ 152 mg g -1 at pH 2.0, highlighting Cyanidiales’ unique capability to retain Cr. Apart from their sorption capability, the ability to simultaneously reduce Cr(VI) without requiring additional chemicals and partition Cr(III) intracellularly highlights the potential of Cyanidiales as innovative and sustainable remediation materials, particularly in challenging environmental conditions. (Reported by Yen-Lin Cho, National Chung Hsing University) This report features the work of Yu-Ting Liu and her collaborators published in J. Hazard. Mater. 445 , 130334 (2023). TPS 44A Quick-scanning X-ray Absorption Spectroscopy TLS 01B1 X-ray Microscopy TLS 14A1 IR Microscopy TLS 17C1 EXAFS • TXM, IR , XAS • Environmental and Earth Sciences, Biological Science, Chemistry Reference 1. Y.-L. Cho, Y.-M. Tzou, C.-C. Wang, Y.-C. Lee, L.-C. Hsu, S.-L. Liu, A. Assakinah, Y. H. Chen, N. A. T. Than, Y.-T. Liu, J. Rinklebe, J. Hazard. Mater. 445 , 130334 (2023). Water Significantly Enhances Formation of Secondary Organic Aerosols in the Ozonolysis of Limonene A combination of undulator-based aerosol vacuum ultraviolet photoelectron spectroscopy, high-resolution mass spectrometry, and density functional theory calculations revealed that water plays a multi-faceted role in enhancing the formation of secondary organic aerosols during the ozonolysis of limonene. A tmospheric aerosols play a profound role in atmospheric chemistry, Earth’s radiation budget, regional and global climates, and public health. According to planetary boundary theory, 1 atmospheric aerosol loading is one of nine major aspects that can affect the stability of Earth due to anthropogenic activities. However, the chemical composition, formation and transformation mechanisms, physical morphology, and other factors affecting atmospheric aerosol loading are not yet fully understood. A better understanding of these aspects could help with more accurate predictions of the impact of atmospheric aerosols on the climate and overall environmental ecosystem.