2021年11月28日，我院桂和荣教授科研团队的彭位华、林曼利、桂和荣等教师与北京师范大学等单位合作在国际著名期刊Journal of Cleaner Production（2020年影响因子9.297，JCR分区：Q1区，中科院分区：环境科学与生态学大类一区TOP）在线发表了题为“Toxicity of coal fly ash and coal gangue leachate to Daphnia magna: Focusing on typical heavy metals”（https://doi.org/10.1016/j.jclepro.2021.129946）的研究论文。
该论文以煤系固体废弃物粉煤灰和煤矸石为供试材料，重点关注了其典型重金属（Cd, Cr, Cu, Zn, Pb和Ni）的浸出特性及其对大型溞（D. magna）的生物毒性，探究了材料特性和关键重金属含量等因素对D. magna可能致毒机制。研究结果对鉴定煤系固体废弃物的重金属生物毒性、指导粉煤灰和煤矸石的安全管理与利用有理论和实际意义。
论文摘要：To identify potential toxicity of heavy metals (HMs) in coal fly ash (FA) and coal gangue (CG), this study measured Cd, Cr, Cu, Zn, Pb and Ni in two FAs and two CGs, and assessed their leachates' toxicity to Daphnia magna (D. magna). The results showed that the selected HMs in material and their leachates were low. However, under simplified Elendt M7 medium exposure system, the added leachates inhibited the survival and reproduction of D. magna. The HMs in D. magna increased as leachate increased, and D. magna mortality increased as the HMs in D. magna increased overall. The Cr and Ni in D. magna both showed significant linear positive correlation with the mortality. These indicated that HMs in leachate dilutions were important reason to inhibit D. magna. Moreover, the HMs in leachate also changed the biomarkers and caused oxidative stress in D. magna. Antioxidant system and cell structure of D. magna were further destroyed as leachates increased. The leachates’ inhabitation (mortality and living offspring) to D. magna depended on the properties of FA and CG, and the chemical composition of their leachates. Element level (e.g., C, S and N) and their chemical speciation (e.g., S2− and NH4+) likely impacted the leaching rate and toxicity of HMs.
