Rapid Screening of Substances of Lower Ecological Concern
Summary of Results
The results obtained at each step of the rapid screening approach are summarized in Figure 2. A simplified spreadsheet, that provides the outcome of each step of the approach for each of the substances, is also available (Environment Canada, 2007c).
Of the 1066 substances assessed using rapids screening, 4 organic substances were found to have chemical structures similar to those of substances identified as PBiT through the categorization process (step 1). These structural categories have been identified as priorities for screening assessment. Therefore, these 4 substances were identified as requiring further assessment, and did not proceed to subsequent steps of rapid screening.
Of the 1062 substances evaluated using exposure scenarios (step 2), results for 836 gave no indication of a potential for ecological harm based on the conservative exposure scenarios considered. The other 226 substances were identified as requiring further assessment, and did not proceed to subsequent steps of rapid screening.
The remaining 836 substances were evaluated using the mechanical filters (step 3). Twenty-nine of these appear on international lists of high production volume (HPV) chemicals, and were therefore identified as requiring further assessment. A further 390 substances proceeded to the manual process stage. Of these, 53 were identified as requiring further assessment.
Figure 2: Summary of rapid screening results
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