Selenium-containing substance grouping

Help on accessing alternative formats, such as Portable Document Format (PDF), Microsoft Word and PowerPoint (PPT) files, can be obtained in the alternate format help section.

Certain selenium-containing substances are among those identified as priorities for action for the second phase of the Chemicals Management Plan (CMP). The selection of these selenium-containing substances for action is based on the categorization process completed in 2006.

Summary of Publications

Some of these substances (CAS RNs 3425-46-5, 7782-49-2, 7783-07-5 and 144507-49-3) were not identified under subsection 73(1) of the Canadian Environmental Protection Act, 1999 (CEPA 1999) but were included as part of the moiety-based assessment.

Selenium-containing substances on the Domestic Substances List
CAS RN Chemical Substance Draft Screening Assessment Proposed Risk Management Scope
1306-24-7 Cadmium selenide (CdSe) HTML HTML
3425-46-5 Selenocyanic acid, potassium salt
5819-01-2 Dodecane, 1,1'-selenobis-
7446-08-4 Selenium oxide (SeO2)
7446-34-6 Selenium sulphide
7488-56-4 Selenium sulfide (SeS2)
7782-49-2 Selenium
7783-00-8 Selenious acid
7783-07-5 Hydrogen selenide (H2Se)
7791-23-3 Seleninyl chloride
10102-18-8 Selenious acid, disodium salt
10214-40-1 Selenious acid, copper(2++) salt (1:1)
12002-86-7 Silver selenide (AgSe)
12069-00-0 Lead selenide (PbSe)
12137-76-7 Palladium selenide (PdSe)
12214-12-9 Cadmium selenide sulfide (Cd2SeS)
12626-36-7 Cadmium selenide sulfide (Cd(Se,S))
12656-57-4 C.I. Pigment Orange 20
13410-01-0 Selenic acid, disodium salt
20405-64-5 Copper selenide (Cu2Se)
21559-14-8 Selenium, bis(diethylcarbamodithioato-S)bis(diethylcarbamodithioato-S,S')-
56093-45-9 Selenium sulfide
58339-34-7 C.I. Pigment Red 108
67711-98-2 Slags, dore furnace
69029-73-8 Leach residues, tellurium
121053-28-9 Electrolytes, cobalt-manufg.
129618-35-5 Electrolytes, copper-manufg.
144507-49-3 Slimes and Sludges, sulfuric acid manuf., sulfur dioxide cooling tower, selenium-contg.
152923-45-0 Slimes and Sludges, mercury conc. roasting off gas condensate
Date Activity
Summer 2016 Anticipated Publication in Canada Gazette of final assessment decisions under paragraphs 68(b) and (c) and subsection 77(6) of CEPA 1999, release of Government's proposed risk management approach document and start of 60-day public comment period on the proposed risk management approach document.
September 16, 2015 Deadline for submission of public comments on the draft screening assessment and the proposed risk management scope document.
July 18, 2015 Publication in Canada Gazette and start of 60-day public comment period on
  1. the draft screening assessments and
  2. the risk management scope document.
December 1, 2013 Deadline for submission of any voluntary information by interested stakeholders.
October 1, 2013 Deadline for submission of information for the section 71 Notice (without an extension).
May 25, 2013 Release of the section 71 Notice with respect to certain selenium-containing substances and the accompanying technical documents.

If needed, information gathering tools could be used to inform potential risk management actions.

Draft Screening Assessment and Risk Management Scope

In July 2015, the draft screening assessment and the risk management scope were released and the related Notice was published in the Canada Gazette, Part 1: Vol. 149, No. 29 - July 18, 2015 (PDF Version - 1,301 K).

The draft screening assessment focuses on the selenium moiety (selenium and its compounds), and therefore includes substances containing selenium in all oxidation states (selenite, selenate, elemental, selenide), organic selenium, and all forms of selenium found in the environment. The selenium assessment encompasses all twenty-nine selenium-containing substances on the Domestic Substances List (DSL) including those that met categorization criteria.

The draft screening assessment has proposed to conclude that "selenium and its compounds", which includes, but is not limited to, the 29 selenium-containing substances on the DSL, are harmful to the environment and human health and therefore meet the criteria under paragraph 64(a) and 64(c) of CEPA 1999.

It is proposed that selenium and its compounds be recommended for addition to the List of Toxic Substances in Schedule 1 to CEPA 1999 based on environmental and human health concerns. A risk management scope document was also released in conjunction with this publication. There is a 60-day public comment period associated with these publications.

Submissions Received

Submissions Received for Selenium-containing Substances Grouping
Type of Response Number of Submissions
Mandatory section 71 Notice 5
Declaration of Stakeholder Interest 26
Voluntary Data Submissions (for example, studies, additional information) 11


Section 71 Notice (Mandatory Survey)

In May 2013, a Notice was issued in the Canada Gazette, Part I: Vol. 147, No. 22 - May 25, 2013 (PDF Version - 2307 K) under section 71 of CEPA 1999. This Notice applied to a subset of 23 substances which are part of the Selenium-containing Substance Grouping.  Every person to whom this Notice applied was required to comply with the Notice no later than 5:00 p.m. EDT, October 1, 2013.

Report a problem or mistake on this page
Please select all that apply:

Privacy statement

Thank you for your help!

You will not receive a reply. For enquiries, contact us.

Date modified: