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Search: WFRF:(Hjelm M) > (2000-2004)

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  • Eklind, Y., et al. (author)
  • Formation of chloromethoxybenzaldehyde during composting of organic household waste
  • 2004
  • In: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 56:5, s. 475-480
  • Journal article (peer-reviewed)abstract
    • Standardized household waste was mixed with different litter amendments, straw, leaves, hardwood shavings, softwood shavings, paper, and sphagnum peat, resulting in six compost mixtures. In addition non-amended household waste was composted. Composting was done in small rotatable bins and compost samples were taken on a regular basis until day 590. Extraction and analysis of wet compost samples showed no evidence for the presence of chloroorganic compounds. Drying and re-wetting of compost samples, however, revealed that chloromethoxybenzaldehyde (CMBA) was formed in all composts at concentrations varying between 5.6 and 73.4 µgkg-1 dry matter. CMBA was not present in the original materials. During composting, there was a clear positive relation between formation of CMBA and microbial activity, as indicated by C losses and temperature. Formation took place during the most intensive phase of composting when C losses were highest. Under anaerobic conditions, however, which prevailed initially in the non-amended compost, no CMBA was formed. Calculation of total amounts of CMBA in composts revealed that there was a small decrease during storage in the hardwood, peat, and softwood composts. However, all composts contained CMBA after 590 days. The mean concentration was 33.4 µgkg-1 dry matter (s.d.=21.9). Possible biocidal effects of composts when used in cultivation may be explainable by the presence of natural toxic compounds formed during composting. © 2004 Elsevier Ltd. All rights reserved.
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