This European Standard specifies three methods of digestion for solid recovered fuels:a) microwave assisted digestion with hydrofluoric, nitric and hydrochloric acid mixture;b) hot water bath digestion of with hydrofluoric, nitric and hydrochloric acid mixture, after ashing of the SRFs sample;c) oven digestion with nitric, perchloric and hydrofluoric acid mixture.Instrumental determination of Si, Al, K, Na, Ca, Mg, Fe, P, and Ti is performed by Inductively Coupled Plasma Spectrometry with optical detection or other suitable spectroscopic techniques such as Flame Atomic Spectroscopy.The effectiveness of the digestion can be verified by qualitative X-ray fluo