Abstract In the northern Adriatic coast of Croatia, combustion of super-high organic sulphur rich Rasa coal was common between 1970 and 2000. These Late Paleocene coals are enriched in a number of trace elements. This work aims to provide a detailed study on the distinctive geochemical patterns of the Rasa coal and investigate the environmental effects of the coal and combustion by-products on the area. Several analytical techniques were used to study the mode of occurrence, distribution, levels and solubility of major and trace elements in the Rasa coal, fly ash, slag and soils in an area within 10 km from the power station. Due to the sulphur-rich calcareous depositional environment of the Rasa coal, the combustion by-products are enriched in S and Ca. Fly ash and slag are enriched in potentially harmful trace elements i.e. Se, Mo, Hg, V and U. Similar enrichment pattern was found for soils suggesting that resuspension and deposition of airborne coal and fly ash particles, transport of gaseous species in the flue gas by dominant winds and/or leaching from ash deposits may have affected the wider environment. Whilst a large number of trace elements were found to be poorly soluble across samples, the leachable concentrations of Se, Cr and Mo in fly ash and slag are noteworthy. Their organic association in coal enhances volatilisation during combustion and then further condensation on ash particles as readily soluble oxyanionic species. Other oxyanionic metalloids such as As or V were insoluble in fly ash and slag, due to precipitation of solubility-limiting Ca-bearing species.

中文翻译：

---

超高有机硫 Raša 煤的地球化学特征以及克罗地亚 Plomin 燃煤电站附近燃烧产物和污染土壤中有毒微量元素的迁移

摘要 在克罗地亚北部亚得里亚海沿岸，1970 年至 2000 年间燃烧超高有机硫的 Rasa 煤很常见。这些晚古新世煤富含多种微量元素。这项工作旨在详细研究 Rasa 煤独特的地球化学模式，并调查煤和燃烧副产品对该地区的环境影响。使用多种分析技术研究了距电站 10 公里范围内的 Rasa 煤、粉煤灰、矿渣和土壤中主要和微量元素的发生模式、分布、水平和溶解度。由于 Rasa 煤富含硫的钙质沉积环境，燃烧副产物富含 S 和 Ca。飞灰和矿渣富含潜在有害的微量元素，即硒、钼、汞、钒和铀。在土壤中发现了类似的富集模式，这表明空气中煤和粉煤灰颗粒的再悬浮和沉积、主导风在烟道气中的气态物质的运输和/或从灰沉积物中的浸出可能影响了更广泛的环境。虽然发现大量微量元素在样品中溶解性差，但飞灰和炉渣中可浸出的 Se、Cr 和 Mo 浓度值得注意。它们在煤中的有机结合增强了燃烧过程中的挥发，然后在灰分颗粒上进一步凝结为易溶的含氧阴离子物质。由于限制溶解度的含钙物质的沉淀，其他含氧阴离子类金属（例如 As 或 V）不溶于飞灰和矿渣。