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, 12
- Publisher
- de Gruyter
- Copyright
- Copyright © 2015 by the
- ISSN
- 1338-0532
- eISSN
- 1338-0532
- DOI
- 10.1515/rput-2015-0008
- Publisher site
- See Article on Publisher Site
Abstract
Abstract An apparatus for measuring biodegradability of metalworking fluids (MWFs) was constructed according to (1), based on the Zahn-Wellens test which enables a continuous determination of CO 2 production by the change in conductivity of absorption solution. Results obtained from the testing of 8 different MWFs by this modified method were compared to those obtained in standardized OECD 302 B. The comparison showed better description of bacterial inoculum activity in tested solution; lag phase was easy to indicate. Tested emulsion achieved the level of primary degradability 39.7 – 40.8 %, and semi-synthetics 19.1 – 43.5%. The samples of synthetics where the degradation level reached 43.9 - 58.6 % were identified as the most degradable metalworking fluids.
Journal
Research Papers Faculty of Materials Science and Technology Slovak University of Technology – de Gruyter
Published: Jun 1, 2015