Figure 7.

Scaled LA-ICP-MS elemental maps (arbitrary unit) for Ca, Y, Ce, Al and Fe of a leaf transect covering two hydathodes of commercial Saxifraga paniculata grown on Y doped soil and the PCA loadings plot for both hydathodes; (f) is an optical image of the leaf and the ablated region; (a) shows the whole elemental map of Ca with the hydathodes encircled in white (no adjustment of contrast); (b–e) are elemental maps of Y, Al, Fe and Ce of the left hydathode; (h–k) are elemental maps of Y, Al, Fe and Ce of the right hydathode; (g) shows the loadings plot of the PCA performed on all pixels within the ROIs illustrated by the yellow outline on each map; Spot-size: 10 µm; Frequency: 10 Hz; Scan-speed: 10 μm/s; Laser power density: 3.74 GW/cm²; Fluence: 18.72 J/cm²; Contrast: 0.3% of saturated pixels; Maximum pixel values are indicated in brackets.