研究興趣
海洋有機碳生地化循環、化學海洋學、海洋放射性化學
代表著作
Chuang, C.-Y. A.*, & Ho, Y.-H. (2023). The influence of sources and solid phase extraction criteria on dissolved organic matter optical properties in aquatic systems. Frontiers in Marine Science, 10. https://www.frontiersin.org/articles/10.3389/fmars.2023.1140702
Yu, Q., Chuang, C.-Y. A.*, Jiang, Y.*, Zhong, H., Cundy, A., Kwong, R. W. M., et al. (2023). Exploring Environmental Nanoplastics Research: Networks and Evolutionary Trends. Reviews of Environmental Contamination and Toxicology, 261(1), 12. https://doi.org/10.1007/s44169-023-00031-3
Lin, I.-S. #, Chuang, C.-Y. A.#, Shih, C.-L.* (2023). Dose-response technique combined with stable isotope tracing for drug metabolite profiling by using high-resolution mass spectrometry. Frontiers in Pharmacology. 14:1293540. https://doi.org/10.3389/fphar.2023.1293540
Harfmann, J. L.*, Guillemette, F., Kaiser, K., Spencer, R. G.M., Chuang, C.-Y. A., Hernes, P. J. (2019). Convergence of terrestrial dissolved organic matter composition and the role of microbial buffering in aquatic ecosystems. Journal of Geophysical Research: Biogeosciences, 124(10), p3125-3142.
Chuang, C.-Y. A.*, Santschi, P.H., Xu, C., Jiang, Y., Ho, Y.-F., Quigg, A., Guo, L.D., Hatcher, P.G., Ayranov, M., Schumann, D. (2015b). Molecular level characterization of diatom associated biopolymers that bind 234Th, 233Pa, 210Pb, and 7Be in seawater: a case study with Phaeodactylum tricornutum. Journal of Geophysical Research: Biogeosciences, 120, p1858-1869.
Chuang, C.-Y. A.*, Santschi, P. H., Wen, L.-S., Guo, L., Xu, C., Zhang, S., Jiang, Y., Ho, Y.-F., Schwehr, K. A., Quigg, A., Hung, C.-C., Ayranov, M., Schumann, D. (2015a). Binding of Th, Pa, Pb, Po and Be radionuclides to marine colloidal macromolecular organic matter. Marine Chemistry, 173, p320-329.
Chuang, C.-Y. A.*, Santschi, P.H., Jiang, Y., Ho, Y.-F., Quigg, A., Guo, L., Schumann, D. (2014). Important role of biomolecules from diatoms in the scavenging of particle reactive radionuclides of thorium, protactinium, lead, polonium, and beryllium in the ocean: A case study with Phaeodactylum tricornutum. Limnology and Oceanography, 59(4), p1256-1266.
Chuang, C.-Y. A.*, Santschi, P.H., Ho, Y.-F., Conte, M. H., Guo, L., Schumann, D., Ayranov, M., Li, Y.-H. (2013). Role of biopolymers as major carrier phases of Th, Pa, Po, Pb and Be radionuclides in settling particles from the Atlantic Ocean. Marine Chemistry, 157, p131-143.
重要研究與突破
以生物指標(Biomarker)追蹤溶解態有機碳的源(source)、匯(sink)、反應性(reactivity)和儲量(budget) 世界主要的植被分布正隨著全球氣候變遷而改變,自河川流入海洋的陸源溶解態有機物(DOM)也隨之變化。溶解態有機物的來源產生變化時,連帶的也會改變其於微生物群落中的生物可利用性。Harfmann et al., (2019)的研究顯示,儘管維管束植物初始的溶解態有機分泌物有著獨特的光學特性,在經過微生物及微生物-光化學降解作用後,就會喪失其獨特的化性(可經由光學係數及生物指標變化看出)。在淡水或河口系統中,Harfmann et al., (2019)觀測到DOM在水中的組成會因為前述的降解作用趨於一致,這樣的機制在未來植被改變並導致水體中的植物源有機碳組成改變時,穩定自然水中的溶解態有機物循環。
生物有機聚合物(biopolymer)對自然水中放射性核種的分化及清除扮演的角色 天然放射性核種如釷(Th)、鏷(Pa)等等的同位素,長久以來被當成海洋中作用的示蹤劑,特別是半衰期長的鏷-231(231Pa)、釷-230(230Th),經常被拿來估算邊界的清除作用、海洋中的循環作用及古生產力。儘管如此,在懸浮或沉降顆粒中,不同的放射性核種比例會隨著其化學組成、地理位置、深度、顆粒大小而變化。許多野外採樣的研究顯示,雖然生物有機聚合物的吸附作用就某種程度而言,極具控制放射性核種的清除作用的潛力,但顆粒的總有機碳含量並非清除作用最佳的評估指標。這可能是因為生物有機聚合物在顆粒的傳輸通量中占有的比例極低,並且與生物體中的礦物部份如生物源的矽或碳酸鈣殼體,共同生成顆粒(co-produced),因此當計算顆粒中的主要成份時,有機聚合物的角色就不明顯。在Chuang et al. (2013, 2015a)的野外採樣研究結果顯示,Hydroxamate Siderophoric (親鐵的螯合蛋白)是生物有機聚合物中,主要與沉降顆粒及膠體態有機物上的放射性核種釷、鏷、釙鍵結的官能基; 碳酸鈣及生物源矽是預測海水中釷和鈹的清除及分化作用的重要指標。實驗數據充分地支持矽藻Phaedoctylum tricornutum殼體中的生物聚合物大幅地增加了鈹-7、釷-234、鏷-233、釙-210的分布係數(Kd,分布係數用以計算物質在顆粒態及溶解態間的分布情形) (Chuang et al., 2014, 2015b)。
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