Cyanides
Information sheet
These substances were identified for action under the Chemicals Management Plan (CMP). The ecological portion of the screening assessment used a moiety-based approach that focused on free cyanide [hydrogen cyanide (HCN) and the cyanide anion (CN-)] and precursors of free cyanide. As such, the ecological moiety conclusion includes, but is not limited to, the 10 substances identified in the table below; however, the human health conclusion is limited to those 10 substances.
| Substance group | CAS RN (cyanides that met categorization criteria) | Common name | DSL name | Proposed order and RIAS | Public comments on the draft screening assessment | Final screening assessment | Proposed risk management approach | Conclusion on section 64 criteria | Follow-up activities |
|---|---|---|---|---|---|---|---|---|---|
| Cyanides | 74-90-8 | Hydrogen cyanide | Hydrocyanic acid | HTML | HTML | HTML | HTML | Meets one or more of the criteria | Refer to proposed risk management approach |
| 143-33-9 | Sodium cyanide | Sodium cyanide | |||||||
| 506-61-6 | Potassium dicyanoargentate | Argentate(1-), bis(cyano-C)-, potassium | |||||||
| 13601-19-9 | Tetrasodium ferrocyanide (yellow prussiate of soda) | Ferrate(4-), hexakis(cyano-C)-, tetrasodium, (OC-6-11) | |||||||
| 13746-66-2 | Tripotassium ferricyanide | Ferrate(3-), hexakis(cyano-C)-, tripotassium, (OC-6-11)- | |||||||
| 13943-58-3 | Tetrapotassium ferrocyanide (yellow prussiate of potash) | Ferrate(4-), hexakis(cyano-C)-, tetrapotassium, (OC-6-11)- | |||||||
| 13967-50-5 | Potassium dicyanoaurate | Aurate(1-), bis(cyano-C)-, potassium | |||||||
| 14038-43-8 | Ferric ferrocyanide (Prussian blue, insoluble) | Ferrate(4-), hexakis(cyano-C)-, iron(3+) (3:4), (OC-6-11)- | |||||||
| 25869-00-5 | Ferric ammonium ferrocyanide | Ferrate(4-), hexakis(cyano-C)-, ammonium iron(3+) (1:1:1),(OC-6-11)- | |||||||
| 25869-98-1 | Potassium ferric ferrocyanide (Prussian blue, soluble or Turnbull's blue) |
Ferrate(4-), hexakis(cyano-C)-, iron(3+) potassium (1:1:1), (OC-6-11)- |
| Date | Activity |
|---|---|
| June 24, 2023 | Publication in Canada Gazette, Part I, of a notice under section 71 of the Canadian Environmental Protection Act, 1999 (CEPA 1999). |
| March 18, 2023 | Publication in the Canada Gazette, Part I, Vol. 157, No. 11 and start of a 60-day public comment period on a proposed order adding free cyanide, cyanide salts and cyanide complexes to Schedule 1 to the Canadian Environmental Protection Act, 1999. |
| February 25, 2023 | Publication of the final screening assessment. The proposed risk management approach was also published for a 60-day public comment period. The related notice was published in the Canada Gazette, Part I, Vol. 157, No. 8. |
| February 10, 2018 | Publication and start of 60-day public comment period on the draft screening assessment and the risk management scope. The related notice was published in the Canada Gazette, Part I: Vol. 152, No. 6. |
Information gathering
Section 71 CMP 2023
In June 2023, a notice was published in the Canada Gazette, Part I: Vol. 157, No. 25 – June 24, 2023 under section 71 of CEPA 1999. This notice applies to HCN (CAS RN 74-90-8). More information is available on the Information gathering with respect to certain substances under the Chemicals Management Plan web page.
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