Substituted Diphenylamine Substance Grouping

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

Final screening assessment of SDPAs
CAS RN Chemical substance Public comments on the draft screening assessment Final screening assessment
101-67-7 Benzenamine, 4-octyl-N-(4-octylphenyl)- HTML 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
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

Timelines
Date Activity
December 9, 2017 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, 2012 Deadline for submission of information for the section 71 notice (without an extension).
June 30, 2012 Release of the section 71 notice with respect to certain SDPA substances and the accompanying technical documents.

Final screening assessment

In December 2017, the Final Screening Assessment for SDPAs was released and the related notice was published in the Canada Gazette, Part I: Vol. 151, No. 49 – December 9, 2017. In the final screening assessment, the Government of Canada concluded that none of the 14 SDPAs assessed poses a risk to the environment or to human health and, therefore, do not meet any of the criteria under section 64 of CEPA 1999.

Based on results of the final screening assessment, the Government of Canada is proposing to delete BNST from Schedule 1 of CEPA 1999. The Prohibition of Certain Toxic Substances Regulations, 2012, were also also modified to remove the restrictions on BNST. More information is available on the Batch 4 web page.

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). There was a 60-day public comment period associated with this publication. The comments received on the draft screening assessment were taken into consideration in drafting the final screening assessment. 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 was also subject to a 60-day public comment period.

Information gathering

Information on SDPAs was gathered from industry and interested stakeholders through 3 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.

Mandatory survey - section 71 notice

In June, 2012, a notice was issued in the Canada Gazette, Part I: Vol.146, No.26 - June 30, 2012 under section 71 of CEPA 1999. This notice applied to 13 substances which are part of the SDPA Substance Grouping.

A compilation of the non-confidential data received on certain substituted diphenylamine substances in response to the section 71 notice, including information submitted on a voluntary basis, is available via the Government of Canada Open Data Portal. Along with the compilation, a non-confidential information summary provides general information on the volume of information received and the substances, activities, substance functions, commercial uses and sectors most often reported.

Background

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 (including from sampling) became available showing a lower potential of these substances to accumulate and cause harm to aquatic and terrestrial organisms than previously determined based on available information. This new information had an influence on the previous assessment conclusion for 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 based modifications to existing risk management measures for BNST 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.

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