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Unexpected arsenic compounds in low-rank coals

机译：低阶煤中意外的砷化合物

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摘要

Nine low-rank coal samples from three different coal basins (Velenje and Trbovlje basins, Slovenia, and Sokolov basin, Czech Republic) were analyzed for their elemental composition and the presence of arsenic compounds. Total arsenic concentrations in the samples were 1.59-5.77 mu g g(-1) with one exception, 142 mu g g(-1) for a sample from the Sokolov basin. A methanol/water mixture (1:1) extracted 15.1-38.7% of the total arsenic from Velenje basin samples but only 2.2-7.1% from Sokolov and Trbovlje basin samples. Extracts from the Velenje basin samples contained mainly the tetra methylarsonium ion (0.14-0.92,mu g g(-1)) with considerable amounts of arsenate (0.15-0.85 mu g g(-1)) and monomethyl arsonic acid (0.04-0.27 mu g g(-1)). In methanol/water extracts from samples from the Sokolov and Trbovlje basins inorganic arsenic (arsenate) prevailed (0.26-37.1 mu g g(-1)), but at least trace amounts of organic arsenic compounds were found as well. It is likely that biogeochemical degradation of organic material is related to the unexpected organoarsenic compounds found in low-rank coals. However, it should also not be ruled out that abiogenic synthesis could have taken place in the carbon-rich environment under the harsh conditions present (elevated temperature and pressure).
机译：分析了来自三个不同煤炭盆地（斯洛文尼亚的Velenje和Trbovlje盆地以及捷克共和国的Sokolov盆地）的九个低品位煤样品的元素组成和砷化合物的存在。样品中的总砷浓度为1.59-5.77μg g（-1），唯一的例外是来自Sokolov盆地的样品中的142μg g（-1）。甲醇/水混合物（1：1）从Velenje盆地样品中提取了总砷的15.1-38.7％，但从Sokolov和Trbovlje盆地样品中仅提取了2.2-7.1％。韦伦杰盆地样品的提取物主要包含四甲基ar离子（0.14-0.92，μg·g（-1））和大量的砷酸盐（0.15-0.85μg·g（-1））和一甲基a酸（0.04-0.27μg·g） （-1））。从索科洛夫和特尔波夫列盆地的样品中提取的甲醇/水提取物中，无机砷（砷酸盐）占主导地位（0.26-37.1μg（-1）），但也至少发现了痕量的有机砷化合物。有机物质的生物地球化学降解可能与低阶煤中发现的意外的有机砷化合物有关。但是，也不应该排除在当前恶劣条件（升高的温度和压力）下，富含碳的环境中可能发生了非生物合成。

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