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Low-temperature oxygen trap for maintaining strict anoxic conditions

机译:低温氧气阱,用于维持严格的缺氧条件

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A low-temperature O-2 trap was designed in order to achieve strict anoxic conditions. The work was motivated by observation of slow oxidation of Fe(II) in an anaerobic chamber, leading to an estimated 3.8 x 10(-7) atm O-2 (well below the O-2 monitor detection limit) despite recirculation of the N-2:H-2 atmosphere across a Pd catalyst. Very low O-2 activity inside an "anaerobic" chamber can result in erroneous conclusions regarding oxidation-reduction reactivities in anoxic environments. The O-2 trap consisted of two sequential barrier suspensions with 93.2 mM Fe(III) as ferric hydroxide, 0.90 mM FeCl2, and pH 8.1. The partial pressure of O-2 was estimated to be less than 7.5 x 10(-9) atm O-2 when reactors were attached to the traps, based on no observed oxidation of Fe(II).
机译:为了实现严格的缺氧条件,设计了一个低温O-2捕集阱。这项工作是由于观察厌氧室内Fe(II)的缓慢氧化而产生的,尽管N循环了,但仍导致估计为3.8 x 10(-7)atm O-2(远低于O-2监测器的检测极限)。钯催化剂上的-2:H-2气氛。在“厌氧”室内非常低的O-2活性可能导致有关缺氧环境中氧化还原反应性的错误结论。 O-2阱由两个依次的势垒悬浮液组成,分别为93.2 mM Fe(III)作为氢氧化铁,0.90 mM FeCl2和pH 8.1。由于没有观察到Fe(II)的氧化,当将反应器连接到疏水阀时,O-2的分压估计小于7.5 x 10(-9)atm O-2。

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