Portable cryogenic collection of atmospheric nitrous oxide and carbon monoxide for high-precision isotopic analysis

被引:7
作者
Huff, AK [1 ]
Cliff, SS [1 ]
Thiemens, MH [1 ]
机构
[1] UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093
关键词
D O I
10.1021/ac970256w
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
ih portable cryogenic collection system has been constructed for the isolation of atmospheric nitrous oxide (N2O) and carbon monoxide (CO). Ambient air enters the system at a rate of 10 L/min, and N2O condenses in a specially designed stainless steel ultrahigh-efficiency collection (UHEC) trap. The CO is next oxidized to CO2 and removed by a second UHEC trap. In conjunction with drying agents, the UHEC traps remove greater than 99.9989% of atmospheric carbon dioxide (CO2) that would otherwise interfere with CO-derived CO2 analysis. The oxygen in the N2O and CO-derived CO2 samples is subsequently separated for high-precision mass spectroscopic analysis. This system is unique in that it provides for in situ collection and permits simultaneous measurement of the O-18/O-16 and O-17/O-16 ratios in N2O and CO. Results are presented for a series of trials run to determine the ultimate collection efficiency of the UHEC cryogenic traps.
引用
收藏
页码:4267 / 4270
页数:4
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