发明名称 |
Environmental monitoring of organic compounds |
摘要 |
PCT No. PCT/AU95/00456 Sec. 371 Date Feb. 10, 1997 Sec. 102(e) Date Feb. 10, 1997 PCT Filed Jul. 26, 1995 PCT Pub. No. WO96/03633 PCT Pub. Date Feb. 8, 1996Environmental monitoring of low concentration of organic compounds in a medium such as ground water or another environmental fluid is effected by using a diffusion cell (112) having a polymeric membrane formed into a helical tube (125) and immersed in the environmental fluid so that organic compounds at ppb and ppt concentrations diffuse into and through the polymeric material. A carrier gas in the polymeric tube acquires a concentration of the organic compounds substantially in equilibrium with the concentration of the organic compounds in the environmental fluid. For the purpose of permitting monitoring with detectors (116) which are not sensitive to extremely low levels of organic compounds, a concentrating device such as a thermal desorption tube (114) can be provided for processing the gas and periodic thermal activation to discharge therefrom organic compounds to be detected at a sensor.
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申请公布号 |
US5773713(A) |
申请公布日期 |
1998.06.30 |
申请号 |
US19970619537 |
申请日期 |
1997.02.10 |
申请人 |
CRC FOR WASTE MANAGEMENT & POLLUTION CONTROL LIMITED |
发明人 |
BARBER, CHRISTOPHER;PATTERSON, BRADLEY MARK;DAVIS, GREGORY BRUCE;POWER, TERENCE ROBERT |
分类号 |
G01N1/10;G01N1/34;G01N1/40;G01N7/10;G01N13/04;G01N30/04;G01N30/12;G01N30/14;G01N30/62;G01N30/72;G01N33/18;G01N33/24;(IPC1-7):G01N13/00;G01N1/00;B01D15/08 |
主分类号 |
G01N1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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