IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 164 Travel Awardee Presentations Friday, 28 August 2026 / Hall C positive correlation between HPLC and TOC results (r = 0.94, p < 0.05), although TOC-based measurements tended to yield slightly higher BC values and showed greater consistency, in agreement with previous findings [4]. This difference may be associated with potential sample losses and uncertainties in conversion factors inherent to the HPLC-based approach. Overall, the TOC method demonstrated greater versatility and operational simplicity. These findings indicate that, for studies focused on BC estimation in large sample sets, the use of a TOC analyzer represents a suitable and efficient alternative, although it does not provide information on individual BPCA composition. References 1. Haumaier, L., & Zech, W. (1995). Black carbon— possible source of highly aromatic components of soil humic acids. Organic Geochemistry, 23(3), 191–196. 2. Nishimura, S., Tani, M., Fujitake, N., & Shindo, H. (2009). Relationship between distribution of charred plant residues and humus composition in chernozemic soils. Pedologist, 53(2), 86-93. 3. Dittmar, T. (2008). The molecular level determination of black carbon in marine dissolved organic matter. Organic Geochemistry, 39(4), 396–407. 4. Llorente, M., Turrión, M. B., & Glaser, B. (2018). Rapid and economical quantification of black carbon in soils using a modified benzene polycarboxylic acids (BPCA) method. Organic Geochemistry, 115, 197–204. Acknowledgement This research was supported by the MEXT Scholarship (Ministry of Education, Culture, Sports, Science and Technology, Japan).
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