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Hoekstra, E.J. (author), Duyzer, J.H. (author), de Leer, E.W.B. (author), Brinkman, U.A.Th. (author)Since we demonstrated the natural formation of chloroform in soil, the question arose to which extent this contributes to the chloroform present in the atmosphere. Concentration gradients in soil air and atmospheric air of different forests were measured. Chloroform concentration gradients indicating emission occur in forest soils and the...article 2001
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Hoekstra, E.J. (author), de Leer, E.W.B. (author), Brinkman, U.A.T. (author), TNO Milieu, Energie en Procesinnovatie (author)Since the ban on the use of trichloroacetic acid (TCAA) as a herbicide in several countries, TCAA is still found ubiquitously in the environment. The presence of TCAA nowadays is suggested to originate mainly from the atmospheric degradation of tetrachloroethene. Our mass balance calculations indicate that this may be true for the presence of...article 1999
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Wieling, J. (author), Bakkeren, H.A. (author), Peters, R.J.B. (author), van Gils, W.J.C.G. (author), de Leer, E.W.B. (author), Mulder, S.A. (author), van der Burg, P.A. (author), van Renesse van Duivenbode, J.A.D. (author), Instituut voor Milieuwetenschappen TNO (author)In analytical research laboratories, the problem of quality assurance is more difficult to solve than in laboratories devoted exclusively to routine analysis: the former usually have to deal with a much greater variety of samples and may have to develop entirely new methods of analysis. For research laboratories we have developed several...article 1994
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de Leer, E.W.B. (author), Hoofdgroep Maatschappelijke Technologie (author)Afgelopen zomer werd bekend dat de melk van koeien in het Lickebaert gebied (Zuid-Holland) 1,5 maal zoveel dioxine bevatte als toegestaan is. De afvalverbrandingsinstallatie van de Afvalverwerking Rijnmond (AvR) vormt in belangrijke mate de oorzaak van dit probleem. Uit onderzoek van TNO en de TU Delft blijkt dat de dioxinen niet tijdens de...article 1990
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de Leer, E.W.B. (author), Lexmond, R.J. (author), de Zeeuw, M.A. (author), Chemisch laboratorium TNO (author)Toluene is converted into benzaldehyde and halogenated aromatic oxidation products in an air atmosphere at 425 °C with fly ash from a municipal waste incineration plant as the catalyst. Several halogenated products such as chlorinated and brominated benzenes, biphenyls and traces of PCDDs/PCDFs could be detected under these conditions, resulting...article 1989