Comparison of trace element contents in low-temperature and high-temperature ash from coals and biomass
Comparison of trace element contents in low-temperature and high-temperature ash from coals and biomass
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DOI：
10.1016/j.fuel.2004.05.009
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发表时间：
2004-10
期刊：
影响因子：
7.4
通讯作者：
R. Richaud;A. A. Herod-A.;R. Kandiyoti
中科院分区：
文献类型：
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作者：
R. Richaud;A. A. Herod-A.;R. Kandiyoti
用低温(LTA)和高温(HTA)方法对4个煤样和3个生物质样品进行灰化，并测定了煤、生物质和灰样中的一系列微量元素。固体的消解既用湿法灰化，也用微波消解，用电感耦合等离子体质谱仪和某些元素的电感耦合等离子体原子发射光谱分析所得溶液。汞的测定采用分光光度法。被检测的微量元素有Be、V、Cr、Mn、Co、Ni、Cu、Zn、Ga、As、Se、Mo、Cd、Sb、Ba、Pb和Hg。观察了LTA和HTA与原料相比的浓度变化。对于LTAs，Se和Hg部分丧失，而Ba变得更难溶于硝酸，表明转变为BaSO4。煤中痕量元素在转化为HTAs时的行为正如先前的工作所确定的那样，并遵循预期的趋势，Se、Hg、As、Cd、Pb、Zn至少部分挥发。煤中的微量元素含量普遍高于生物质样品中的含量，但生物质样品中的锰、铜和锌含量较高。
Four coal samples and three biomass samples have been ashed by low-temperature (LTA) and high-temperature (HTA) methods and a range of trace elements have been measured in the coals, biomass and ash samples. Digestion of solids was by both wet ashing and by microwave digestion with examination of the resulting solutions by inductively coupled plasma mass spectrometry and by inductively coupled plasma atomic emission spectrometry for certain elements. Hg was estimated by a spectrometric method. The trace elements examined were Be, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, As, Se, Mo, Cd, Sb, Ba, Pb and Hg. Changes in concentration in the LTA and HTA compared with the raw materials were observed. For LTAs, Se and Hg were partially lost while Ba became more insoluble in nitric acid, indicating a change to Ba sulfate. The behaviour of trace elements in the coals on conversion to HTAs was as established by earlier work and followed the expected trends, with Se, Hg, As, Cd, Pb, Zn being at least partially volatile. Trace element concentrations were generally greater in the coals than in the biomass samples, except for Mn, Cu and Zn which were more concentrated in the biomass samples.