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Quantitative 3-D Elemental Mapping by LA-ICP-MS of a Basaltic Clast from the Hanford 300 Area, Washington, USA
journal contribution
posted on 2012-02-21, 00:00 authored by Sheng Peng, Qinhong Hu, Robert P. Ewing, Chongxuan Liu, John M. ZacharaLaser ablation with inductively coupled plasma-mass spectrometry
(LA-ICP-MS) was used to measure elemental concentrations at the 100-μm
scale in a 3-dimensional manner within a basaltic clast sample collected
from the Hanford 300 Area in south-central Washington State, United
States. A calibration method was developed to quantify the LA-ICP-MS
signal response using a constant-sum mass fraction of eight major
elements; the method produced reasonable concentration measurements
for both major and trace elements when compared to a standard basalt
sample with known concentrations. 3-Dimensional maps (stacked 2-D
contour layers, each representing 2100 μm × 2100 μm)
show relatively uniform concentration with depth for intrinsic elements
such as Si, Na, and Sr. However, U and Cu accumulation were observed
near the sample surface, consistent with the site’s release
history of these contaminants. U and Cu show substantial heterogeneity
in their concentration distributions within horizontal slices, while
the intrinsic elements are essentially uniformly distributed. From
these measured U concentrations and published grain size distributions,
gravel and cobbles were estimated to contain about 1% of the contaminant
U, implicating the coarse fraction as a long-term release source.
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Cu showHanford 300 AreaUSALaser ablationbasaltic clast sampleU concentrationssample surfaceconcentration measurementsBasaltic ClastUnited Statesrelease sourceuniform concentrationWashington StateCu accumulationcontaminant Ubasalt sampleconcentration distributionsgrain size distributionstrace elementscalibration method
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