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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
Justification:

Annex XIII of the REACH Regulation (1907/2006) lays down the criteria for the identification of persistent, bioaccumulative and toxic substances (PBT substances), as well as the information that must be considered for the purpose of assessing the P, B, and T properties of a substance. The criteria require that all available information is to be used, employing a weight-of-evidence approach. Substances must meet all three criteria to be considered PBT.

Persistence Assessment: LAS was found to be readily biodegradable in the OECD 301B CO2 Evolution test, with 85% biodegradability in 29 days. Therefore, LAS is not persistent.

Bioaccumulation Assessment: A flow-through fish test (OECD 305E) was conducted to assess the bioaccumulation potential of four different mixtures of LAS. Results indicate BCF values ranging from 2 to 1000. In a supporting study, the bioconcentration of LAS in the marine shrimp Palaemonetes varians was measured in a radiotracer study. The BCF55 for shrimp was calculated to be 159 L/kg. Therefore, LAS is not bioaccumulative.

Toxicity Assessment: None of the long-term NOECs for marine or freshwater organisms are <0.01 mg LAS/L. LAS is not classified as carcinogenic (Category 1 or 2), mutagenic (Category 1 or 2), or toxic for reproduction (Category 1, 2 or 3). There is no evidence of chronic toxicity, as identified by the classifications: T, R48, or Xn, R48 according to Directive 67/548/EEC. Therefore LAS does not meet the PBT criteria for toxicity.

Summary and overall Conclusions on PBT or vPvB Properties

Based on the data collected and the discussion above, LAS does not meet the criteria for either PBT or VPvB as it is readily biodegraded in the environment, has a very low bioaccumulation potential, low chronic aquatic toxicity and is not classified as carcinogenic, mutagenic, or toxic for reproduction or for chronic toxicity.