He Kai-Qiang, Yuan Chun-Gang, Shi Meng-Dan, Jiang Yang-Hong, Yu Su-Juan
Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science & Engineering, North China Electric Power University Baoding 071000 China
MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University Beijing 102206 China.
RSC Adv. 2020 Mar 4;10(16):9226-9233. doi: 10.1039/c9ra08481a. eCollection 2020 Mar 2.
Sequential extraction has been validated as an effective method to assess the fractions of elements in fly ash. However, the time consumption and high labor costs limit the application of the conventional sequential extraction (CSE) for fast screening of elemental fractions in fly ash. In this study, two ultrasound-assisted sequential extraction (UASE) methods were developed for fast analysis of arsenic (As) and selenium (Se) fractions in fly ash (FA). The parameters of UASE were optimized by comparing the results of As and Se obtained from UASE with those values observed CSE. The operation time of sequential extraction procedures for As and Se were shortened from 24.5 h to less than 90 min. A certified reference material (CRM, GBW08401) and real fly ash samples were applied to validate the developed UASE. The recoveries of As and Se were found in the range of 82.3% to 114%. For all fractions, the performance of UASE was faster than CSE with the acceptable uncertainties. The analytical results demonstrated that the concentration of As in F3 was found to be higher than other fractions, while the main forms of Se were found to be in F1 and F3 in the fly ash samples. Based on the advantages of high efficiency and easy operation, the developed UASE procedures can be applied for fast screening of the mobility and bioavailability of As and Se in FA from coal fired power plants.
连续提取已被确认为评估粉煤灰中元素组分的有效方法。然而，耗时和高人工成本限制了传统连续提取法（CSE）在快速筛选粉煤灰中元素组分方面的应用。本研究开发了两种超声辅助连续提取法（UASE），用于快速分析粉煤灰（FA）中的砷（As）和硒（Se）组分。通过比较UASE法和CSE法得到的As和Se结果来优化UASE的参数。As和Se连续提取程序的操作时间从24.5小时缩短至不到90分钟。使用有证标准物质（CRM，GBW08401）和实际粉煤灰样品对所开发的UASE进行验证。As和Se的回收率在82.3%至114%范围内。对于所有组分，UASE的性能比CSE更快，且不确定度可接受。分析结果表明，粉煤灰样品中F3组分的As浓度高于其他组分，而Se的主要形态存在于F1和F3中。基于高效和操作简便的优点，所开发的UASE程序可用于快速筛选燃煤电厂粉煤灰中As和Se的迁移性和生物有效性。
