Pressure disequilibria induced by rapid valve closure in noble gas extraction lines
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Abstract
Pressure disequilibria during rapid valve closures can affect calculated molar quantities for a range of gas abundance measurements (e.g., K-Ar geochronology, (U-Th)/He geochronology, noble gas cosmogenic chronology). Modeling indicates this effect in a system with a 10 L reservoir reaches a bias of 1% before 1000 pipette aliquants have been removed from the system, and a bias of 10% before 10,000 aliquants. Herein we explore the causes and effects of this problem, which is the result of volume changes during valve closure. We also present a solution in the form of an electropneumatic pressure regulator that can precisely control valve motion. This solution reduces the effect to ∼0.3% even after 10,000 aliquants have been removed from a 10 L reservoir.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Pressure disequilibria induced by rapid valve closure in noble gas extraction lines |
| Series title | Geochemistry, Geophysics, Geosystems |
| DOI | 10.1002/2015GC005823 |
| Volume | 16 |
| Issue | 6 |
| Year Published | 2015 |
| Language | English |
| Publisher | AGU Publications |
| Contributing office(s) | Central Mineral and Environmental Resources Science Center |
| Description | 9 p. |
| First page | 1923 |
| Last page | 1931 |
| Google Analytic Metrics | Metrics page |