mecoprop-P (ISO); (R)-2-(4-chloro-2-methylphenoxy)propionic acid

Sediment toxicity

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

sediment toxicity: long-term

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Justification for type of information:

In accordance with Column 2 of REACH Annex X, information requirement section 9.5.1, this study does not need to be conducted as the chemical safety assessment concluded that there is no hazard. The assessment indicated that there is low potential for the substance to adsorb to sediment. The Kow is -0.19 and as such it is consiered hydrophillic. It is not a PBT or vPvB substance. A number of sediment biodegradation studies show that the the test material is degraded in both aerobic and anaerobic sediments. In particular, a sediment biodegradation study (Bieber and Krohn, 1991) showed that the microorganisms involved in the breakdown of the herbicide containing the registered substance used the solvent (methanol) or the active ingredient as a carbon source. Furthermore, Williams et al. (2003) showed that the microbial community adapted relatively quickly to degrade the test material. As such it is considered unnecessary to conduct further testing.

Reference 2

Endpoint:

sediment toxicity: short-term

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Justification for type of information:

In accordance with Column 2 of REACH Annex X, information requirement section 9.5.1, this study does not need to be conducted as the chemical safety assessment concluded that there is no hazard. The assessment indicated that there is low potential for the substance to adsorb to sediment. The Kow is -0.19 and as such it is consiered hydrophillic. It is not a PBT or vPvB substance. A number of sediment biodegradation studies show that the the test material is degraded in both aerobic and anaerobic sediments. In particular, a sediment biodegradation study (Bieber and Krohn, 1991) showed that the microorganisms involved in the breakdown of the herbicide containing the registered substance used the solvent (methanol) or the active ingredient as a carbon source. Furthermore, Williams et al. (2003) showed that the microbial community adapted relatively quickly to degrade the test material. As such it is considered unnecessary to conduct further testing.

Description of key information

In accordance with Column 2 of REACH Annex X, information requirement section 9.5.1, this study does not need to be conducted as the chemical safety assessment concluded that there is no hazard.  The assessment indicated that there is low potential for the substance to adsorb to sediment.  The Kow is -0.19 and as such it is consiered hydrophillic. It is not a PBT or vPvB substance. A number of sediment biodegradation studies show that the the test material is degraded in both aerobic and anaerobic sediments.  In particular, a sediment biodegradation study (Bieber and Krohn, 1991) showed that the microorganisms involved in the breakdown of the herbicide containing the registered substance used the solvent (methanol) or the active ingredient as a carbon source. Furthermore, Williams et al. (2003) showed that the microbial community adapted relatively quickly to degrade the test material.  As such it is considered unnecessary to conduct further testing.