Table 3.

Overview on the analytical standard methods for SRF and solid fuels.

Parameters	Solid recovered fuels	Solid fuels
Scope of application	Solid recovered fuels	Solid mineral fuels (e. g. hard coal, coke, lignite, peat, charcoal and briquettes from these materials)
Ash content	EN 15403[34] Incineration of the sample at (250 ± 10) °C (60 min) and then at (550 ± 10) °C (120 min) in oxidizing atmosphere until the specified mass constancy is reached. ISO/CD 21656 (currently under development)	DIN 51719[35] Incineration of the sample at (500 ± 10) °C (60 min) and then at (815 ± 10) °C (60 min) in oxidizing atmosphere until the mass remains constant. ÖNORM G 1074[36] Incineration of the sample at 500 °C and then at (815 ± 15) °C in oxidizing atmosphere until the mass remains constant. ISO 1171[37] Incineration of the sample at 500 °C (60 min) and then at (815 ± 10) °C (60 min) in oxidizing atmosphere until the mass remains constant.
Main components	EN 15410[38] Obtaining the mass fractions of the main components according to the following methods: 1) Measurement using e. g. ICP-OES or atomic absorption spectrometry after microwave digestion of the non-incinerated sample with hydrofluoric acid, nitric acid and hydrochloric acid. 2) Measurement using e. g. ICP-OES or atomic absorption spectrometry after digestion of the incinerated sample in a warm water bath with hydrofluoric acid, nitric acid and hydrochloric acid. 3) Measurement using e. g. ICP-OES or atomic absorption spectrometry after digestion of the non-incinerated sample in a furnace with hydrofluoric acid, nitric acid and perchloric acid. 4) Measurement using XRF, with pressed pellets or fused tablets being produced from the samples previously incinerated.	DIN 51729–10[39] Obtaining the mass fractions of the main components using XRF after fusion melt (with di-lithium tetraborate, lithium metaborate) of the sample previously incinerated at 950 °C to 1150 °C. DIN 51729–11[40] Obtaining the mass fractions of the main components by means of ICP-OES after fusion melt (e. g. with lithium metaborate) of the sample previously incinerated at 1050 °C and dissolution of the fused bead in diluted HCl solution. DIN 51729–8[41] Obtaining the sodium and potassium oxide contents by atomic absorption spectrometry or ICP-OES after digestion with hydrofluoric acid and hydrochloric acid of the sample previously incinerated at 1050 °C and dissolution of the fused bead in diluted hydrochloric acid solution. ISO 13605[42] Obtaining the mass fractions of the main components using XRF after fusion melt (with di-lithium tetraborate, lithium metaborate) of the sample previously incinerated at 815 °C.