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Titel:
National round robin of biomass fuels and ashes [ECN-C--97-100 ; EWAB-9725]
 
Auteur(s):
 
Gepubliceerd door: Publicatie datum:
ECN 1997
 
ECN publicatienummer: Publicatie type:
ECN-C--97-100 ECN rapport
 
Aantal pagina's: Volledige tekst:
51  Niet beschikbaar.

Samenvatting:
Following a European Round Robin of biomass fuels and ashes with 16laboratories (including the Dutch KEMA), two Dutch institutes (ECN and TNO) performed analyses using samples identical to the ones used for the European project. The main goal was to judge the performance of the Dutch institutes mentioned in comparison with a large number of European laboratories. Furthermore, the results can be used together with the European results to form a basis for international standards for biomass fuels and biomass ash analyses. Four fuel samples, four ash samples and two digest solutions were analysed in the project. Both partners were free to choose the measurement methods. The results were evaluated during a meeting where a representative of KEMA (one of the 16 laboratories that participated in the European project) was also present. Where deviations from the European results appeared to be too large, it was decided to repeat the measurement using a different method. After this first correction, the results generally were in good agreement with the European results. Most major deviations are due to the fact that the values measured were close to the detection limits of the methods used. Furthermore, it was observed that the determination of Cl-content in both fuel and ash samples is 'difficult'. It also appeared to be necessary to dilute some of the samples to obtain agreement with European results as far as the concentration of Pb and Zn was concerned. This was also observed in the European project and was attributed to the complex matrix of the samples: minerals and organic compounds. Ash contents as measured by ECN and TNO in the straw samples turn out to be 20-25% too high, compared to the European results measured at the same temperature (815C). It is not clear what causes this difference. It may be due to the extra time the samples have been stored (about 1 year). A systematic deviation was also observed for the concentration of elements in the ash digest solution. Here, ECN measured on average 20% less than the laboratories within the European project. For TNO this was 12%, for which no reason could be found. 2 figs., 5 tabs., 2 refs., 4 appendices


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