Sb isotope fractionation of strong Chemical Weathering in Tropical
Description
This study aims to explore the mechanism of antimony (Sb) isotope fractionation during chemical weathering and soil biogeochemical processes, which has important implications for the Sb isotope composition in the hydrosphere. We analyzed the major and trace element contents and Sb isotope composition along an 8 m deep basalt weathering profile in the Huguangyan area of Guangdong Province in southern China.
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The investigated basaltic weathering profile is located in the northeastern Leizhou Peninsula, Guangdong Province, southern China. The major elements in the samples were quantified via X-ray fluorescence (XRF) spectrometry (ARL PerformX 4200, Thermo Fisher, USA), and the trace elements were analyzed via inductively coupled plasma‒mass spectrometry (ICP‒MS) (Agilent 7500, Agilent, USA) after digestion. The mineral composition of the soil samples, basalts and minerals used for adsorption experiments were semi-quantitatively analyzed using X-ray diffraction (Smartlab SE, Rigake, JPN). The mineral surface area was determined with the BET (Brunauer–Emmett–Teller) method (Micromeritics APSP2460, Micromeritics Instrument Ltd., USA). The soil pH was measured using a pH meter (LC-PH-3 L, Shanghai Lichen Bangxi Instrument Technology Co., Ltd, CHN) with a soil-to-water ratio of 1:2.5 (w/w). The Sb isotopic composition of the samples was characterized using a Nu plasma II multicollector inductively coupled plasma mass spectrometer (MC-ICP‒MS) (Nu Instruments Ltd, UK).