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.

Summary of publications
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
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.
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