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Re: Test for nickel and mercury
John Gwilliam schrieb:
> ... looking for a quick field test for detecting nickel in meteorites.
> I'm also curious if anyone is aware of a relatively
> simple test for detecting mercury in meteorites.
Hello John and List,
Here are some references and an excerpt from a paper on Allende.
Perhaps some of this is helpful or may help you find more useful
background info!
EHMANN W. et al. (1967) The abundance of mercury in meteorites and rocks
by neutron activation analysis (GCA 31, 357-376).
S. Jovanovic et al. (1987) Hg concentrations in and geothermometry of
Antarctic achondrites (abs. Meteoritics 22-4, 1987, 423).
S.Jovanovic et al. (1987) Isotopically anomalous Hg in Antarctic
meteorites (abs. Meteoritics 22-4, 1987, 424).
A.N. Thakur, P.S. Goel (1989) High variations in the isotopic ratio
196Hg / 202Hg in some acid-insoluble residues of Sikhote Alin and other
iron meteorites (Earth Planet.Sci.Lett. 96, 235-246).
G.W.Reed, Jr., S. Jovanovic (1990) Isotopic Hg in an Allende carbon-rich
residue (Meteoritics 25, 345-346, excerpt):
A 16.2 g Allende sample was demineralized with HF-HCI to give 18.6 mg of
carbon-rich residue. After thermal neutron irradiation, Hg was extracted
by stepwise heating at temperatures of 130, 175 (two fractions), 300,
600, 900, and 1200°C. The volatilized Hg was collected in cold traps,
dissolved with a HNO3 solution of Hg carrier and subjected to
radiochemical separations. The final precipitates were mounted on Al
cards for counting (Reed and Jovanovic, 1969; Jovanovic and Reed, 1976,
1987, 1990). Several of the Hg samples released gave 197/203
radioactivity ratios that were about 60% higher than the ratio in the
monitor, i.e., terrestrial Hg, and from samples thermally released from
bulk AIlende measured in the same experiment. In the case of the bulk
sample only two temperature fractions were counted with sufficient
precision to be useful. In this carbon residue experiment (Experiment
C-2 in Jovanovic and Reed, 1980) the Hg was extracted early enough after
the end of the irradiation to permit good counting statistics for both
radionuclides. The large sample of carbon residue was also an important
factor.
Some further references:
GOEL P.S. and THAKUR A.N. (1989) Variable 196Hg/202Hg ratio in
meteorites (Meteoritics 24, 270).
JOVANOVIC S. and REED, Jr. G.W. (1976) 196Hg/202Hg isotopic ratios in
chondrites: Revisited (Earth Planet. Sci. Lett. 31, 95-100).
JOVANOVIC S. and REED, Jr. G.W. (1980) Hg and Pt-metals in meteorite
carbon-rich residues: Suggestions for possible host phase for Hg (GCA
44, 1399-1407).
JOVANOVIC S. and REED, Jr. G.W. (1987) Isotopically anomalous 196Hg and
202Hg in Antarctic achondrites (Geophys. Res. Lett. 14, 1127-1130).
JOVANOVIC S. and REED, Jr. G.W. (1990) Hg isotopes on the moon and in
achondrites (Chem. Geol., Isotope Geoscience Section, 80, in press).
REED G. W. and JOVANOVIC S. (1969) 196Hg and 202Hg isotopic ratios in
chondrites (J. Inorg. Nucl. Chem. 31, 3783-3788).
Best regards, good night, and "bless you"
Bernd
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