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Substituted Diphenylamine Substance Grouping

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Certain substituted diphenylamines (SDPAs) were among those that were identified as priorities for action for the second phase of the Chemicals Management Plan (CMP). The selection of these substances was based on the categorization process completed in 2006, and new information received as part of the first phase of the CMP.

Summary of Publications

Draft Screening Assessment of SDPAs
CAS RN Chemical Substance Draft Screening Assessment
Table 1 footnotes
Table 1 footnote 1

The substance BNST was previously assessed in Batch 4 of the Challenge initiative and was re-assessed based on new information obtained after its original assessment and structural similarity to the other SDPAs.

Return to table 1 footnote 1 referrer

101-67-7 Benzenamine, 4-octyl-N-(4-octylphenyl)- HTML
4175-37-5 Benzenamine, 4-octyl-N-phenyl-
10081-67-1 Benzenamine, 4-(1-methyl-1-phenylethyl)-N-[4-(1-methyl-1-phenylethyl)phenyl]-
15721-78-5 Benzenamine, 4-(1,1,3,3-tetramethylbutyl)-N-[4-(1,1,3,3-tetramethylbutyl)phenyl]-
24925-59-5 Benzenamine, 4-nonyl-N-(4-nonylphenyl)-
26603-23-6 Benzenamine, ar-octyl-N-(octylphenyl)-
27177-41-9 Benzenamine, ar-nonyl-N-phenyl-
36878-20-3 Benzenamine, ar-nonyl-N-(nonylphenyl)-
68411-46-1 Benzenamine, N-phenyl-, reaction products with 2,4,4-trimethylpentene
68442-68-2 Benzenamine, N-phenyl-, styrenated
68608-77-5 Benzenamine, 2-ethyl-N-(2-ethylphenyl)-, (tripropenyl) derivs.
68608-79-7 Benzenamine, N-phenyl-, (tripropenyl) derivs.
68921-45-9Table 1 footnote 1 Benzenamine, N-phenyl-, reaction products with styrene and 2,4,4-trimethylpentene (also known as BNST)  
184378-08-3 Benzenamine, N-phenyl-, reaction products with isobutylene and 2,4,4-trimethylpentene  
 
Timelines
Date Activity
December 2017 Anticipated publication in Canada Gazette of final assessment decision under subsection 77(6) of the Canadian Environmental Protection Act, 1999 (CEPA 1999).
February 8, 2017 Deadline for submission of public comments on the draft screening assessment.
December 10, 2016 Publication in Canada Gazette and start of a 60-day public comment period on the draft screening assessment for SDPA substances and the consultation document on BNST.
December 31, 2012 Deadline for submission of any voluntary information by interested stakeholders.
October 30, 2012Deadline for submission of information for the section 71 Notice (without an extension).
June 30, 2012Release of the section 71 Notice with respect to certain substituted diphenylamine substances and the accompanying technical documents.

Draft Screening Assessment

In December 2016, the draft screening assessment for SDPAs was released and the related Notice was published in the Canada Gazette, Part 1: Vol. 150, No.50 - December 10, 2016 (PDF Version - 3,980 K). The draft screening assessment proposes to conclude that none of the 14 SDPAs assessed pose a risk to the environment or to human health and, therefore, do not meet any of the criteria under section 64 of CEPA 1999. This proposed conclusion also applies to BNST, considered among the fourteen substances, which had previously been found to meet the criteria set out in section 64 (b) of CEPA 1999 in a 2009 screening assessment conducted during the Challenge initiative of the CMP. There is a 60-day public comment period associated with this publication. Given the proposed change in conclusion for BNST and potential implications to the regulatory requirements for this substance, the Government of Canada also published a consultation document on the proposed approach regarding future regulatory amendments for BNST. The consultation document on BNST is also subject to the 60-day public comment period.

A final screening assessment for SDPAs will be published following the public comment period and further assessment. The Government of Canada will base any modification to existing risk management measures for BNST, if needed, on the findings of the final screening assessment and consultations with stakeholders on the proposed approach regarding future regulatory amendments for BNST.

Submissions Received

Information on SDPAs was gathered from industry and interested stakeholders through three mandatory survey notices issued under section 71 of CEPA 1999. These surveys originated from the Challenge initiative, Phase 1 of the Domestic Substances List Inventory Update, and the Substance Grouping Initiative. Stakeholders were also invited to complete a voluntary questionnaire.

Submissions Received for SDPAs
Type of Response Number of Submissions
Mandatory section 71 Notice 61
Declaration of Stakeholder Interest 27
Voluntary Data Submissions (for example, studies, additional information) 34

Background

Section 71 Notice (Mandatory Survey)

In June, 2012, a Notice was issued in the Canada Gazette, Part I: Vol.146, No.26 - June 30, 2012 (PDF Version - 5,248 K) under section 71 of CEPA 1999. This Notice applied to 13 substances which are part of the SDPA Substance Grouping. Every person to whom this Notice applied was required to comply with the Notice no later than 5 p.m. EDT, October 30, 2012, or by January 3, 2013 if an extension request was made.

Launch of the next phase of the Chemicals Management Plan

In October 2011, an announcement was published in the Canada Gazette, Part I: Vol. 145, No. 41- October 8, 2011 regarding planned actions to assess and manage, where appropriate, the risk posed by certain substances to the health of Canadians and the environment. This initiative builds on the first phase of the CMP by identifying approximately 500 substances, in nine substance groupings, as priorities for the second phase of the CMP.

Benzenamine, N-phenyl-, reaction products with styrene and 2,4,4-trimethylpentene (BNST): CAS RN 68921-45-9

During the preparation of the assessment of SDPAs, significant new information became available regarding the inherent toxicity and bioaccumulation potential of these substances. This new information had an influence on the previous assessment conclusion for another SDPA, Benzenamine, N-phenyl-, reaction products with styrene and 2,4,4-trimethylpentene (CAS RN 68921-45-9), also known as BNST, assessed under the Challenge (Batch 4) in 2009. As a result, BNST has been re-assessed with the initial 13 SDPAs identified as part of the Substance Groupings Initiative of the CMP. The Government of Canada will base any modification to existing risk management measures for BNST, if needed, on the findings of the final screening assessment and consultations with stakeholders on the proposed approach for BNST in advance of its 2018 regulatory deadline.