In The Netherlands a large quantity of domestic, agricultural and industrial organic wastes is produced. After purification or composting processes these substances can be partly re-used as organic fertilisers on the condition that this does not lead to contamination of the environment. In the so called Dutch regulation "Besluit kwaliteit en gebruik Overige Organische Meststoffen" (BOOM) (1) sewage sludge, compost and soil are considered as organic fertilisers. For these fertilisers the regulation sets maximum residue limits for the heavy metals cadmium, chromium, copper, mercury, lead, nickel, zinc and arsenic. By BOOM, normalised methods (NEN) are prescribed for the determination of these elements. RIKILT organised as supervisor of the regulation BOOM an interlaboratory study to check the performance of the laboratories involved in BOOM analysis
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