Abstract
The biosignificant content of heavy metals in six different compost materials was established with the use of separate chemical extractions. The directly available fraction of heavy metals, assessed by extraction with 0.01 M CaCl2, was in general <1% of the total content in compost. The potentially available fraction, assessed by extraction with 0.2 M EDTA (pH=4.65) was shown to be <50% of the total content for cadmium, lead and zinc and up to 35% for copper.
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