Micro X-ray fluorescence mapping of ferromanganese nodules in the northwestern Pacific ocean
Description
Attached are micro X-ray fluorescence mapping of multiple parallel sections of three nodules. Nodules B8, B11, and B26 of ~ 4.9 cm, 5.2 cm and 6.4 cm grain size were cut into 7, 8, and 9 sections, respectively.Nodule B8 has 7 parallel layers of data. Nodule B11 has 8 parallel layers of data. Nodule B26 has 9 parallel layers of data.
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The experiments were performed at Qingdao Speed Analysis & Test Co., Ltd. using a μ-XRF spectrometer (Bruker M4 Tornado, Germany) with an Rh anode tube at 50 kV and 200 μA current. The tests were performed in a vacuum environment (20 mba). Rectangular checkboxes covering the maximum cross-sections of the nodules were analyzed in steps of 20 μm with a single-point residence time of 10 ms/pixel point to obtain elemental matrix data and distribution maps. The excitation unit of the instrument consists of an X-ray tube and a multi-guide capillary focusing mirror, which can focus X-rays in an area as small as 14 μm, thus obtaining excellent spatial resolution and allowing high-precision quantitative analyses of surface scans.
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Funding
the National Natural Science Foundation of China
92162216