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Oxy-Anion
Stable Isotope Center (OASIC)
|
OASIC Hall of Fame
Current members:
Issaku Kohl, Yongbo
Peng, Tao Sun, Bryan Killingsworth,
Xiaoqian Li, Adam Bao, and Huiming Bao
Past members and visitors:
Margarita Khachaturyan, Katy Jenkins, Katie Howell,
Chee-Haur Siew, Tao Fang, Katie Bourgeois (Houston), Zhi-Guo Mu, Bing Shen,
and Ruben Asatryan, Joanie Wisekal, Mathhew Schroeder, Ashley Hesser, Yun
Liu,
Equipment and facilities:
IRMS (Finnigan MAT 253) system
with TC-EA and conflo-III interface,
Laser-fluorination systems,
Vacuum extraction lines (including GC),
A fully equipped wet-chemistry facilities (including
IC and freeze-dryer). |
Specialty:
Total
isotope mesurement of water-soluble oxyanions, e.g., sulfate, nitrate, and
perchlorate:
d15N,
d18O, d17O, d34S, d33S, and d36S values for
SO42-, NO3-, or ClO4-
We
routinely run multiple oxygen isotope composition (d18O and
D17O) for sulfate.
Facilities,
Equipment, and other Resources
The Stable isotope laboratory
suite, at LSU Department of Geology & Geophysics, consists of two rooms
with a total area of ~ 1200 ft2. The suite has three fume hoods,
three vacuum-lines, a CO2-laser fluorination system, a newly
acquired isotope ratio mass spectrometer (IRMS) (Finnigan MAT 253). The
laboratory has a research associate (M. Khachaturyan).
Wet-chemistry
facilities (funded by LSU) -- These include an Ion Chromatograph system
(ICS-90), one freeze-dryer, two ovens, one de-ionized water generator, two
centrifuges, clean bench with worktops, binocular microscopes, an electronic
top-loading balance, two ultrasonic cleaners, stir & heaters, water bath,
desiccation cabinets, a corrosives cabinet, filters & apparatus, shakers, a
rock crusher, and two weighing scales (down to 1 microgram). It is a fully
equipped wet-chemistry laboratory supporting multiple stable isotope analyses.
A CO2-laser
fluorination system (funded by NSF and LSU) – It has been built and has
analyzed > 1000 samples so far. This system (MIR 10, New-Wave Inc.) has a
30-W CO2 laser that is computer-controlled and easy to operate. The
primary purpose of this line is to fluorinate BaSO4 to get O2
for the measurement of both d18O
and d17O values for sulfate (Bao and Thiemens,
2000).
User can analyze 12 to 18 samples per working day.
Finnigan MAT
253 (Funded by NSF) – This IRMS system has 8 collectors and has been
calibrated independently for Δ17O,
d18O, and d15N analysis and is in excellent
working condition. A TCEA system with conflo-interface III has the capacity to
generate N2 and CO from AgNO3 or CO from BaSO4 and CsClO4.
LSU Oxy-Anion
Stable Isotope Center
(OASIC) is a unique stable isotope laboratory that is specialized in the
isotope-ratio measurements of most elements in water-soluble oxy-anions such as
sulfate, nitrate, or perchlorate. It is capable of chemical preparation and
measurement of Δ17O, d18O, d17O, d15N,
and multiple sulfur isotope compositions for SO42-, NO3-,
or ClO4-. All the stable isotope compositions can be
measured to the best precisions and in the most efficient approaches thus far
available in the community.
Other related
facilities -- The Department of Geology and Geophysics at LSU is well
equipped with analytical facilities that are supportive to this research
project. It has ICP-AES (Perkin-Elmer 6500), Dionex 500 ion chromatography
system, Perkin Elmer 3300 atomic absorption spectrophotometer and furnace
system, JEOL 840 Scanning Electron Microscope w/ EDS x-ray probe, JEOL JXA-733
automated electron microprobe w/WDS & EDS analyzers, with
cathodoluminescence detector and digital image analysis system, isotope preparation
lab (Class 100 and Class 1000), X-ray powder diffractometers (Siemens and
Philips), and computing facilities (e.g., SGI PowerChallenge Server and SGI
Indy).
In
addition, LSU have several machine shops and glass shops that serve the college
and the University with very reasonable fee.
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