Rationale for list of regulated substances under Canadian Environmental Protection Act: chapter 5
5. Threshold Calculation for Substances in CRAIM List Originating from MIACC Lists
The list of substances and the threshold quantities for toxic substances originating from the MIACC List were based on expert opinion.
These threshold quantities were recalculated using the methodology that the U.S. Environmental Protection Agency used for the RMP. The principle of "Equivalent Harm" was followed. The IDLH published in 1990 were used for assessing toxicity. The 1990 IDLH values were chosen to be consistent with the RMP numbers. Future updates of the threshold quantities could be formulated using appropriate toxicity levels. The detailed calculations are presented in Exhibit 5. A summary is presented in Table 9 for toxics and Table 10 for flammables. It is recommended that the MIACC threshold quantities that are currently based on expert opinion which are difficult to trace and reproduce, be replaced by the calculated thresholds using RMP methodology.
| Chemical | CRAIM Threshold Quantity Tonnes (lbs) |
Recalculated Thresholds Quantities Using RMP Methodology with IDLH 1990 Criteria Tonnes (lbs) |
|---|---|---|
Notes: |
||
| 1,2-Dichloroethane1 | 50.00 (110,000) | 6.80 (15,000) |
| 2-Chloroethanol | 1.00 (2,200) | 4.50 (10,000) |
| Allyl Chloride | 0.45 (1,000) | 9.10 (20,000) |
| Carbon monoxide | 10.00 (22,000) | 6.80 (15,000) |
| Chloropicrin | 0.22 (500) | 2.27 (5,000) |
| Chlorosulphonic acid | 1.00 (2,200) | 2.27 (5,000) |
| Cyanogen bromide | 1.00 (2,200) | 4.50 (10,000) |
| Hydrobromic acid | 2.25 (5,000) | 1.13 (2,500) |
| Ketene | 0.05 (110) | 0.22 (500) |
| Mercury2 | 1.00 (2,200) | 1.00 (2,200) |
| Methacryloyloxyethyl isocyanate | 0.05 (1,000) | Essentially not in Canadian commerce |
| Methacrolein (Methacrylaldehyde) | 0.45 (110) | Essentially not in Canadian commerce |
| Methyl bromide | 1.15 (2,500) | 6.80 (15,000) |
| Methyl iodide | 3.40 (7,500) | 4.50 (10,000) |
| Methyl vinyl ketone | 0.05 (1,000) | Essentially not in Canadian commerce |
| Nitrogen dioxide | 0.11 (220) | 1.13 (2,500) |
| Osmium tetroxide | 0.05 (110) | 0.22 (500) |
| Phenol | 10.00 (22,000) | 9.10 (20,000) |
| Stibine | 0.22 (500) | 2.27 (5,000) |
| Tetraethyl lead | 1.00 (2,200) | 2.27 (5,000) |
| Thionyl Chloride | 0.11 (220) | 6.80 (15,000) |
| Trioxychlorofluoride | 2.25 (5,000) | 6.80 (15,000) |
| Chemical | CRAIM Threshold Quantity Tonnes (lbs) |
Recalculated Thresholds Quantities Using RMP Methodology Tonnes (lbs) |
|---|---|---|
Notes: |
||
| 1,2-Dichloroethane1 | 50 (110,000) | |
| Benzene | 10 (22,000) | 10 (22,000)2 |
| Gasoline | 50 (110,000) | 150 (330,000)3 |
| Cyclohexane | 50 (110,000) | 550 (1,210,000) |
| Ethylbenzene | 50 (110,000) | 7 000 (15,400,000) |
| Ethylbenzene | 50 (110,000) | 7 000 (15,400,000) |
| Natural gas | 4.5 (10,000) | 4.5 (10,000)4 |
| Petroleum ether | 50 (110,000) | 50 (110,000)4 |
| Dimethyl sulphide | 10 (22,000) | 150 (330,000) |
| t-Butylamine | 10 (22,000) | 150 (330,000) |
| Toluene | 50 (110,000) | 2 500 (5,500,000) |
| Xylene | 50 (110,000) | 8 000 (17,600,000) |