UVCB definition

UVCB means a substances of Unknown or Variable composition, Complex reaction products or Biological materials;
View Source

Examples of UVCB in a sentence

  • A registration may cover compositions of a substance having different hazards profiles: UVCB substances may have more than one reported composition that is relevant for hazard assessment; the same applies to mono-constituent substances with different impurities triggering different classification.

  • In accordance with the guidance available for assessment of multi-constituent and UVCB substances, the PBT assessment for anthracene oil, anthracene paste, anthracene fraction focuses on the assessment of its PAH-constituents present in concentrations ≥ 0.1% w/w4 such as anthracene (presence 50-70%) and phenanthrene (25-45%).

  • The constituents of UVCB substances are not subdivided into main-constituents and impurities, thus the purity of UVCB substances is always 100%.

  • For a UVCB substance like MCCP, observed toxicity may represent toxicity of one or more of its constituents.

  • In accordance with the guidance available for assessment of multi-constituent and UVCB substances, the PBT assessment for anthracene oil focuses on the assessment of its PAH-constituents present in concentrations ≥ 0.1%3 such as anthracene (presence 3-25%), fluoranthene (2-15%), pyrene (1-10%) and phenanthrene (10- 35%).

  • Substances can be divided into three main groups: well-defined substances, well-defined substances that require additional identifiers, and substances that qualify as UVCB (Unknown or Variable composition, Complex reaction products or Biological materials) substances.

  • Quaterphenyls and terphenyls are relevant constituents of the UVCB substance.

  • However, if the substance has an Unknown or Variable composition, Complex reaction products or Biological materials (UVCB), the concept of impurities does not apply.

  • Based on the weight-of-evidence assessment of available relevant information, terphenyl, hydrogenated fulfils the B and vB criteria because: - A measured BCF value in Rainbow trout above the vB criterion, 12 993, is determined for o-terphenyl (o-T), a relevant constituent of the UVCB substance (Schlechtriem 2016).