分析化学(期刊)
薄膜中的扩散梯度
土壤水分
显微镜
化学
扩散
荧光显微镜
X射线荧光
分辨率(逻辑)
同步加速器
磷
荧光
材料科学
环境化学
光学
环境科学
土壤科学
有机化学
计算机科学
人工智能
物理
热力学
作者
Claudia Moens,Enzo Lombi,Daryl L. Howard,Stefan Wagner,Justin L. Payne,Peter M. Kopittke,Casey L. Doolette
标识
DOI:10.1021/acs.est.3c06237
摘要
A novel binding layer (BL) as part of the diffusive gradients in thin films (DGT) technique was developed for the two-dimensional visualization and quantification of labile phosphorus (P) in soils. This BL was designed for P detection by synchrotron-based X-ray fluorescence microscopy (XFM). It differs from the conventional DGT BL as the hydrogel is eliminated to overcome the issue that the fluorescent X-rays of P are detected mainly from shallow sample depths. Instead, the novel design is based on a polyimide film (Kapton) onto which finely powdered titanium dioxide-based P binding agent (Metsorb) was applied, resulting in superficial P binding only. The BL was successfully used for quantitative visualization of P diffusion from three conventional P fertilizers applied to two soils. On a selection of samples, XFM analysis was confirmed by quantitative laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The XFM method detected significant differences in labile P concentrations and P diffusion zone radii with the P fertilizer incubation, which were explained by soil and fertilizer properties. This development paves the way for fast XFM analysis of P on large DGT BLs to investigate in situ diffusion of labile P from fertilizers and to visualize large-scale P cycling processes at high spatial resolution.
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