Betekenis van:
headspace

headspace
Zelfstandig naamwoord
    • the volume left at the top of a filled container (bottle or jar or tin) before sealing

    Hyperoniemen


    Voorbeeldzinnen

    1. Sampling by headspace sampler.
    2. Connection for ground glass joint Headspace
    3. biodegradation > 60 % in ISO 14593 (CO2 headspace test).
    4. biodegradation ≥ 60 % in ISO 14593 (CO2 headspace test).
    5. Agitation also facilitates oxygen transfer from the headspace to the liquid so that aerobic conditions can be adequately maintained.
    6. The reference method for laboratory testing of surfactant ultimate biodegradability in this Regulation is based on the EN ISO standard 14593: 1999 (CO2 headspace test).
    7. e.g. EN ISO Standard 14593:1999 — Water quality — Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium — Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test).
    8. Using closed flasks with a headspace, it is possible to test slightly volatile substances (with Henry’s law constants < 100 Pa·m3/mol or < 10–3 atm·m3/mol) without losses from the test system.
    9. Assessment and verification: The applicant shall provide a test report, using the following test method: Milling and weighing of sample. Sampling by headspace sampler. Analysis by gas chromatography, detection by flame-ionisation detector.
    10. The resulting sediment sample should be transported in a container with a large air headspace to keep the sediment under aerobic conditions (cool to 4 °C if transport duration exceeds 2-3 hours).
    11. e.g. EN ISO Standard 14593:1999 — Water quality — Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium — Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test). Pre-adaptation is not to be used.
    12. EN ISO Standard 14593: 1999 — Water quality — Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium — Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test).
    13. The surface sediment can be prepared as follows: extract several sediment cores using a tube of transparent plastic, slice off the upper aerobic layers (from surface to a depth of max. 5 mm) immediately after sampling and pool them together. The resulting sediment sample should be transported in a container with a large air headspace to keep the sediment under aerobic conditions (cool to 4 °C if transport duration exceeds 2-3 hours).
    14. Surfactants shall be considered as readily biodegradable if the level of biodegradability (mineralisation) measured according to one of the five following tests is at least 60 % within 28 days: CO2 headspace test (OECD 310), carbon dioxide (CO2) evolution modified Sturm test (OECD 301B; Council Directive 67/548/EEC Annex V.C.4-C), closed bottle test (OECD 301D; Directive 67/548/EEC Annex V.C.4-E), manometric respirometry (OECD 301F; Directive 67/548/EEC Annex V.C.4-D), or MITI (I) test (OECD 301C; Directive 67/548/EEC Annex V.C.4-F), or their equivalent ISO tests.
    15. Surfactants shall be considered as readily biodegradable if the level of biodegradability (mineralisation) measured according to one of the five following tests is at least 60 % within 28 days: CO2 headspace test (OECD 310), carbon dioxide (CO2) Evolution Modified Sturm test (OECD 301B; Directive 67/548/EEC Annex V.C.4-C), Closed Bottle test (OECD 301D; Directive 67/548/EEC Annex VC(4E)), Manometric Respirometry (OECD 301F; Directive 67/548/EEC Annex VC(4D)), or MITI (I) test (OECD 301C; Directive 67/548/EEC Annex VC(4F)), or their equivalent ISO tests.