文摘
Diffusive gradients in thin films (DGT) and planar optode (PO) imaging is combined. A single hydrogel layer contains both, ion binding materials and a pH luminophore. DGT is analyzed by laser ablation ICP-MS, PO imaging uses a ratiometric method. Anion binding materials interfered with pH sensing, while the cation resin did not. Single-layer imaging is easier to handle and offers reduced artifact susceptibility.