From Perchlorate in breast milk to Perchlorate on Mars - Sandy DasGupta ..
Δημοσιεύτηκε στις 1 Απρ 2016
The
Phoenix mission to Mars clearly demonstrated the usefulness of wet
chemistry analyses to understand the composition of planetary surfaces,
and it tentatively revealed the presence of ~0.5% of perchlorate by
weight of Martian soil. This talk will explore why open tubular ion
chromatography (OTIC) is the necessary next step in wet chemistry
analyses for planetary exploration, both in terms of technical
feasibility, and science versatility. We will discuss the performance of
OTIC in comparison to other approaches such as capillary
electrophoresis. Jorgenson, the father of capillary zone
electrophoresis, reportedly joked about his invention: Capillary
electrophoresis is a wonderful technique but it has only three small
problems: Injection, Separation and Detection. In OTIC, a sample is
injected into a conduit and a response is recorded with or without
eluent suppression. In general, open tubular liquid or ion
chromatography is time efficient only in very small capillaries where
the Jorgenson triad of problems intensify. In recent years we have
learned how to inject pL-multi-nL volumes of samples in the same setup,
generate active chromatographic surfaces within capillaries as small as 5
mm in bore and learned to make miniature detectors to detect analytes
sensitively in such small tubes. The prospects of working meaningfully
on this planet with practical inexpensive equipment (less than $1000 for
a high performance chromatograph!) will also be discussed.
Phoenix mission to Mars clearly demonstrated the usefulness of wet
chemistry analyses to understand the composition of planetary surfaces,
and it tentatively revealed the presence of ~0.5% of perchlorate by
weight of Martian soil. This talk will explore why open tubular ion
chromatography (OTIC) is the necessary next step in wet chemistry
analyses for planetary exploration, both in terms of technical
feasibility, and science versatility. We will discuss the performance of
OTIC in comparison to other approaches such as capillary
electrophoresis. Jorgenson, the father of capillary zone
electrophoresis, reportedly joked about his invention: Capillary
electrophoresis is a wonderful technique but it has only three small
problems: Injection, Separation and Detection. In OTIC, a sample is
injected into a conduit and a response is recorded with or without
eluent suppression. In general, open tubular liquid or ion
chromatography is time efficient only in very small capillaries where
the Jorgenson triad of problems intensify. In recent years we have
learned how to inject pL-multi-nL volumes of samples in the same setup,
generate active chromatographic surfaces within capillaries as small as 5
mm in bore and learned to make miniature detectors to detect analytes
sensitively in such small tubes. The prospects of working meaningfully
on this planet with practical inexpensive equipment (less than $1000 for
a high performance chromatograph!) will also be discussed.
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