Fig. 3
From: X-ray fluorescence spectroscopy (XRF) for metallome analysis of herbarium specimens
A schematic diagram illustrating the typical herbarium XRF measurement setup in a. b A photo shows the front view of the Thermo Fisher Scientific Niton XL3t 950 GOLDD+ with the face plate removed, revealing the detector window, tube window, and filter holder. c Fluorescence artefact peaks which spectrally coincides with the position of Fe, Ni, Zn, and unknown peaks are observed in the XRF spectrum of the cardboard measured according to the setup shown in a. No first-row transition metal was detected in the cardboard except for Fe which is 69 µg g−1 based on ICP-AES analysis