Instrumental neutron activation analysis was used at a 2-month long isochronous short term stability test performed on a Perna perna mussel candidate reference material. The assessment of the analysis of variance test, as well as, the normalized results
to the control temperature showed no systematic changes in the concentration of Ag, As, Br, Co, Cr, Cs, Fe, Eu, La, Na, Rb,
Se, Sc, Th and Zn during the test period. The result showed that the candidate reference material may be transported under
normal transport conditions without significant changes in composition for the determined elements.