Portable trap-sensor system for monitoring low levels of ethylene

被引:28
作者
Jordan, LR
Hauser, PC
Dawson, GA
机构
[1] UNIV AUCKLAND,DEPT CHEM,AUCKLAND,NEW ZEALAND
[2] IND RES LTD,AUCKLAND,NEW ZEALAND
关键词
amperometric sensor; ethylene; preconcentration;
D O I
10.1039/a702444d
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A portable device for measuring trace amounts of ethylene is described, Ethylene was trapped on a silver catalyst, which was then flash heated, releasing a plug of ethylene into a flowing gas stream, The ethylene was detected using an amperometric sensor with a gold-Nafion sensing electrode, For a trap time of 10 min, a detection limit of 1 ppb of ethylene was:achieved. This compares with 40 ppb obtained using the sensor without pretrapping. In addition to the improvement in sensitivity, the,trapping procedure also allowed improved selectivity, making the device suitable for applications where very low levels of ethylene need to be measured and interferents may be present.
引用
收藏
页码:811 / 814
页数:4
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