Peng, Sheng Hu, Qinhong Ewing, Robert P. Liu, Chongxuan Zachara, John M. Quantitative 3-D Elemental Mapping by LA-ICP-MS of a Basaltic Clast from the Hanford 300 Area, Washington, USA Laser 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. Cu show;Hanford 300 Area;USALaser ablation;basaltic clast sample;U concentrations;sample surface;concentration measurements;Basaltic Clast;United States;release source;uniform concentration;Washington State;Cu accumulation;contaminant U;basalt sample;concentration distributions;grain size distributions;trace elements;calibration method 2012-02-21
    https://acs.figshare.com/articles/journal_contribution/Quantitative_3_D_Elemental_Mapping_by_LA_ICP_MS_of_a_Basaltic_Clast_from_the_Hanford_300_Area_Washington_USA/2548045
10.1021/es2023785.s001