The Canadian Domestic Substances List categorization highlighted that of the approximately 11,300 listed organic chemicals merely 3% have measured bioaccumulation data (only in fish), 4% have measured half-lives in air (based on laboratory simulated reactions), and only 12 chemicals have measured biodegradation half-lives in water, soil, or sediment (Arnot and Gobas 2006; Environment Canada 2006).
The report found that while the categorization of substance abuse as a catastrophic illness was unusual, there was no evidence that Mr. Newsom had pressured anyone.
Also, although categorization of substances susceptible to LRT is also considered in the regulations, this will not be specifically addressed.
There are a number of international and national programs that are concerned with the categorization of substances that are persistent (P or very P (vP)), bioaccumulative (B or very B (vB)), toxic (T), or have the potential for long-range transport (LRT) [1].
A key difference between these is the recommendation for the use of weight of evidence for assessment of properties relevant to the categorization of substances for P, B, and T. We believe that the use of a formal, quantitative, and transparent process of weight of evidence should be included in the guidance for the selection of appropriate data and how these are compared to the criteria.
Quality of data is important when assessing the properties of any substance for the purposes of categorization or assessment of risks.
There is inconsistency in the criteria used for categorization of various substances under regulations in the EU.
He is hip-hop, which means that he skirts categorization.
It is needed because the weight of the individual evaluation criteria leading to a final reliability and relevance categorization strongly depends on study design, substance tested, and organisms used.
