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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
The PBT Assessment for 1,3,5-triazine-2,4,6(1H,3H,5H)-trithione, trisodium salt (TMT) is based on the criteria set out in the “Guidance on information requirements and chemical safety assessment, Chapter R.11: PBT Assessment” (ECHA, 2008).



Evidence of P and vP properties

TMT showed no biodegradation in tests carried out according to guidelines OECD 302B, DEV H5/NEN 3235-5.3 and DIN EN ISO 11734. Thus, the test substance is considered to be persistent (P) or very persistent (vP).



Screening criteria

The log D of TMT was determined as 0.73, 0.01 and -1.55 for pH 4, 7, and 9, respectively (Calculation with ACD/LogD Suite Program).

Thus, the test substance does not meet the screening criterion for bioaccumulation and is not considered to be bioaccumulative (B) or very bioaccumulative (vB).



Long-term toxicity testing with Daphnia magna resulted in a NOEC of 6.31 mg/L for TMT (OECD 211) and a NOEC = 7.8 mg/L for Pseudokirchneriella subcapitata (equivalent to OECD 201). Moreover, the test substance is not classified as CMR nor is there any other evidence for chronic toxicity according to Directive 67/548/EEC and Regulation (EC) No. 1272/2008 (2nd ATP) based on the available data.

Thus, the criteria set out in Annex XIII of Regulation (EC) No. 1907/2006 are not met and the test substance is not considered to meet the T criterion.