Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.119 mg/L
Assessment factor:
50
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.239 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.012 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
12 mg/L
Assessment factor:
1
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
2.03 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.2 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.336 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Mecoprop-P n-octyl ester hydrolyses rapidly in natural water. Therefore, the hydrolysis product Mecoprop-P acid (MCPP-P acid) was considered as relevant starting point for the environmental hazard assessment of Mecoprop-P n-octyl ester.

 

Conclusion on classification

According to Regulation EC No 1272/2008, the whole class of "esters of Mecoprop and Mecoprop-P" is legally classified as Aquatic Acute 1; H400 "Very toxic to aquatic life" and Aquatic Chronic 1; H410 "Very toxic to aquatic life with long lasting effects" (Index No. 607-423-00-5).

From a chemical point of view, Mecoprop-P n-octyl ester is a member of this class.

 

However, the data presented in this dossier show a different behavior for Mecoprop-P n-octyl ester with no toxicity in the environment up to the limit of the water solubility (no short-term effects on aquatic invertebrates, on fish and on aquatic plants and no long-term effects on aquatic invertebrates).

 

Mecoprop-P n-octyl ester hydrolyses rapidly in natural water. The resulting hydrolysis product is Mecoprop-P acid (MCPP-P acid).

Following the initial degradation step the studies available for the hydrolysis product Mecoprop-P acid (MCPP-P acid) predict the behavior of Mecoprop-P n-octyl ester in the environment.

 

Therefore, as a worst-case scenario the data from Mecoprop-P acid (MCPP-P acid), the hydrolysis product of Mecoprop-P n-octyl ester, are used for assessment. Mecoprop-P acid (MCPP-P acid) is legally classified as Aquatic Chronic 2; H411 "Toxic to aquatic life with long lasting effects" according to Regulation EC No 1272/2008 (GHS) (Index No. 607-434-00-5).

 

However, the data presented in this dossier show a different behavior of Mecoprop-P n-octyl ester and its hydrolysis product Mecoprop-P acid (MCPP-P acid). Therefore, classification may be changed with the following reasons:

- Mecoprop-P n-octyl ester is considered to hydrolyse rapidly in natural water and the hydrolyses product Mecoprop-P is readily biodegradable.

- The most sensitive acute toxicity is to algae: 72h-EC50 of 23.9 mg/L and a 72h-NOEC of 5.96 mg/L were determined on the alga Anabaena flos-aquae.

 

With the data listed above, Mecoprop-P n-octyl ester should be not classified according to Regulation EC No 1272/2008 (GHS).