Filtern
Dokumenttyp
Sprache
- Englisch (2)
Referierte Publikation
- ja (2)
Schlagworte
- Certification (2) (entfernen)
The resource-saving utilisation of recovered
waste wood is a matter of growing concern. In several
European countries, this utilisation is governed by regulations
and is dependent on the contents of certain trace
elements and organic compounds. Thus, for decisionmaking
with respect to waste wood management (recycling
or combustion), reliable analytical data are needed and, due
to their great economic and environmental impact, must be
assured by appropriate quality control. To support the
improvement in quality assurance in waste wood analysis,
for the first time, a wood reference material was certified
for its mass fractions of arsenic, cadmium, chromium,
copper, lead, mercury, and pentachlorophenol (PCP).
These analytes were selected because they represent typical
constituents of wood preservatives most widely used in the
past. Material preparation and testing of homogeneity and
stability were carried out by BAM Federal Institute for
Materials Research and Testing. The certification measurements
were performed involving selected laboratories
with documented expertise in the field of waste wood
analysis. The certified values and their corresponding
uncertainties were assigned in full compliance with the
requirements of ISO Guide 35. The certified mass fractions
and their expanded uncertainties (k/i> = 2) are as follows:
(3.1 ± 0.5) mg/kg for As, (3.02 ± 0.24) mg/kg for Cd,
(36.4 ± 2.6) mg/kg for Cr, (22.9 ± 1.7) mg/kg for Cu,
(0.60 ± 0.14) mg/kg for Hg, (39 ± 4) mg/kg for Pb, and
(7.9 ± 0.6) mg/kg for PCP. The certified material is
available as European Reference Material ERM®-CD100.
The role of matrix reference materials in the process of demonstrating the degree of equivalence of measurement results obtained from intercomparisons is outlined, reviewing exemplary selected experience gained at BAM regarding the determination of organic contaminants in environmental matrices.
The specific characteristics of reference materials employed in the process of demonstrating equivalence between laboratories in the course of proficiency testing as well as the development, comparison and validation of methods are elaborated. The demand is for series of appropriately characterised samples which are fit for the purpose and it is seen from representative examples that the utilisation of such tailor-made RM designed to tackle the specific need of an analytical problem dominates over certified matrix reference materials in this context. Concluding, the role of certified matrix reference materials in quality assurance is briefly looked at both from the users and providers points of view.