Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany.
Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany.
Sci Total Environ. 2018 Jan 1;610-611:1590-1594. doi: 10.1016/j.scitotenv.2017.06.123. Epub 2017 Jun 23.
Volatile arsenic (As) species, like arsine, mono-, di-, and trimethylarsine (AsH, MeAsH, MeAsH, MeAs) are difficult to sample in remote areas without sophisticated equipment. The application of moss bags is an easy-to-apply screening technique which has been used for trapping total (mostly particulate) As from different emission sources before. We evaluated its potential for additional volatile As species screening. We found MeAsH and MeAs in N atmosphere to be quantitatively trapped on the mosses and to be recoverable as their respective pentavalent acids (and/or oxyanions) when ground mosses were heated for 90min at 90°C in 0.1M HNO/3% HO. MeAsH was trapped partially while AsH was not trapped. The most likely mechanism is covalent bonding to the moss surface. While moss monitoring does not replace more sophisticated techniques for volatile As sampling, it can easily be used as screening technique to determine whether besides particulate As volatile methylated As species could have any relevance in environments with yet unknown As emissions.
挥发性砷（As）物种，如胂、一甲基胂、二甲基胂和三甲基胂（AsH、MeAsH、MeAsH2、MeAs），在没有复杂设备的偏远地区很难采样。苔藓袋的应用是一种易于应用的筛选技术，以前曾用于从不同的排放源中捕获总（主要是颗粒状）砷。我们评估了它对额外挥发性砷物种筛选的潜力。我们发现，在 N 气氛中，MeAsH 和 MeAs 可定量地被苔藓捕获，并在 90°C 下用 0.1M HNO/3%HO 加热 90min 后，可作为其相应的五价酸（和/或含氧阴离子）回收。MeAsH 部分被捕获，而 AsH 未被捕获。最可能的机制是与苔藓表面的共价键合。虽然苔藓监测不能替代更复杂的挥发性砷采样技术，但它可以很容易地用作筛选技术，以确定在未知砷排放环境中，除了颗粒状砷之外，挥发性甲基化砷物种是否有任何相关性。
