Witam: Mam taki fragment tekstu ( tematyka to rtęć): 4. Conclusion Mercury speciation analysis in seafood is influenced by the nature of the matrix and by the analytical method used. Conse- quently, the main difficulty is to preserve the initial distribution of Hg species in the sample because of losses and/or cross-species transformations that may occur. Nowadays, IDA is often used nowa- days in place of external calibration, because the addition of at least two isotopically enriched Hg species in the sample makes it pos- sible to quantify these potential transformations and to correct its Hg species concentrations from its. Indeed, IDA allows researchers to identify critical steps of the method (e.g. lyophilisation/storage, spiking procedure/isotopic equilibrium and extraction/derivation) by acting on the time at which spikes are added to the sample. Muszę z tego zrobić jeden slajd do prezentacji. Jakieś 3-4 odnośniki. Pomożecie?