230 likes | 272 Vues
Global FIA. Some Technology Concepts for Reliable Sampling. Topics . Supported Capillary Membrane Sampler In-Line Filter Probe Zone Fluidics. Supported Capillary Membrane Sampler. Supported Capillary Membrane Sampler (Operating Principle). SCMS Probe in Process Stream or Fast Loop Flow.
E N D
Global FIA Some Technology Concepts for Reliable Sampling
Topics • Supported Capillary Membrane Sampler • In-Line Filter Probe • Zone Fluidics
Supported Capillary Membrane Sampler (Operating Principle) • SCMS Probe in Process Stream or Fast Loop Flow. • Pervaporation of target molecules through membrane tube walls. • Uptake of target VOC molecules into flowing carrier gas. • Transport to analytical finish.
Supported Capillary Membrane Sampler(Conclusion) • The SCMS can increase the reliability of sampling for many VOC’s by a factor of 10 to 100X compared to sparging and similar techniques. • The SCMS is not a panacea. There are some molecules that don’t partition into the membrane material—research into other membrane materials is needed.
Inline Filter (New Science?) • To date, we haven’t found a sample that will irreversibly clog the filter elements, once a suitable backwash interval is identified. • It appears to take longer to irreversibly plug a filter pore than it does to backwash it.
Zone Fluidics • A general-purpose method of fluidic control and manipulation for sampling and/or analysis. • An extension and expansion of Sequential Injection Analysis.
Zone Fluidics (Solvent Extraction) Org S SELECTION VALVE W SEPARATION CELL SYRINGE PUMP Air BE A IPA DETECTOR
Zone Fluidics/Solvent Extraction Solvent Extraction is only one example illustrating that Zone Fluidics allows the complete automation of very complex fluidic operations with compact, simple, and reliable hardware.
Conclusions • Supported Capillary Membrane Extraction increases sampling reliability for VOC’s by at least 10X. • In-Line Filter Probe promises a similar increase in reliability for matrices requiring liquid analysis. • Zone Fluidics provides a potential platform allowing complete automation of all fluidics functions. • All of the above techniques have potential for incorporation into N.E.S.S.I.