Purity of recycled fire-based materials

摘要

In order to study the purity of recycled fibre-based materials, products containing recycled fibre as well as recycled pulp were examined with regard to their chemical impurities, toxicity and microbiological qual- ity. The study was carried out to clarify both qual- itatively and quantitatively the variations in microbiological quality. The levels or several classes of chemical substances were analysed and semi-volatile and volatile substances identified. The toxicity and mutagenicity of virgin fibre and recycled fibre materils were sereened using the Photobacter toxicity test and the Ames Salmonella mutagenicity test.