A miniaturized cryogenic trap design for collection of arsanes
A miniaturized cryogenic trap design for collection of arsanes
复制标题
一种用于收集砷烷的小型化低温捕集器设计
DOI：
10.1016/j.sab.2015.06.014
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
J. Dědina
中科院分区：
文献类型：
--
作者：
M. Svoboda;J. Kratzer;M. Vobecký;J. Dědina
本文提出了一种新的小型化低温捕集器，用于收集无机砷和甲基取代砷生成的砷烷。采用原子吸收光谱法进行检测。低温阱的小型化通过替换常用的石英U形管（45 cm长，2.5/4.3mm i. d./ O.D.，填充有chromosorb）通过U形石英毛细管（U形毛细管，20 cm长，0.53/0.65 mm i. d./ o.d.）。气相干燥器的类型和材料是低温捕集系统的重要组成部分，必须进行优化，以防止U形毛细管被冷冻水堵塞，并防止砷烷损失。固体氢氧化钠的滤芯被认为是最好的解决方案，因为与常用的Nafion膜相比，它具有更高的吸水效率。采用~（73）As放射性指示剂研究了U型管和U型毛细管低温捕集过程，定量分析了氢氧化钠的捕集效率和挥发效率。U形管和U形毛细管的捕集和挥发效率均为100%。研究了U型毛细管中收集的相关实验参数（载气流速、柱长和容量）。最后，基于非极性熔融石英毛细管的小型化、简单化和商业化设计的低温捕集器成功地进行了砷烷的收集过程。
A new miniaturized design of a cryogenic trap for collection of arsanes generated from inorganic and methyl-substituted arsenic species was developed. The detection was performed by atomic absorption spectrometry. The miniaturization of the cryogenic trap was achieved by replacing the commonly used quartz U-tube (45 cm long, 2.5/4.3 mm i.d./o.d., packed with chromosorb) by a U-shaped quartz capillary (U-capillary, 20 cm long, 0.53/0.65 mm i.d./o.d.). The type and material of the gas phase dryer, an essential part of the cryotrapping system, were necessary to optimize to prevent blockage of the U-capillary by frozen water and to prevent loss of arsanes. A cartridge with solid NaOH was found as the best solution because of a higher absorbing efficiency of water compared to commonly used nafion membrane. The diameter of the NaOH beads was found as a crucial parameter influenced loss of arsane.Processes during the cryotrapping procedure with the U-tube and U-capillary were investigated by73As radioactive indicator and arsane trapping and volatilization efficiency were quantified. Trapping and volatilization efficiency of 100% were found in the U-tube as well as in the U-capillary. Relevant experimental parameters for the collection in the U-capillary (carrier gas flow rate, column length and capacity) were studied. Finally, miniaturized, simple and commercially available design of the cryogenic trap based on non-polar fused silica capillary successfully performed the collection procedure of arsanes.
DOI：
10.1016/j.sab.2008.04.006
发表时间：
2008-06
期刊：
Spectrochimica acta. Part B, Atomic spectroscopy
影响因子：
--
作者：
S. Musil;Tomáš Matoušek
通讯作者：
S. Musil;Tomáš Matoušek
影响因子：
3.8
作者：
Carter, DE;Aposhian, HV;Gandolfi, AJ
通讯作者：
Gandolfi, AJ
影响因子：
3.8
作者：
Thomas, DJ;Waters, SB;Styblo, M
通讯作者：
Styblo, M