We propose to develop and carry out a novel in situ SR/electrochemical technique to identify the mechanism underlying ferromagnetism in palladium bionanoparticles. We have established that muons are extremely sensitive to metal:biomass ratio in palladium bionanomaterials. We aim to use a custom-made, in situ electrochemical cell to remove biomaterial from nanoparticles and observe changes to the muon signal while this is proceeding. By correlating the electrochemical behaviour of the particle with changes in the muon signal, we intend to establish which regions of the nanoparticle are associated with ferromagnetism and thereby answer a fundamental physical question.