Phosphorodithioic acid, O,O-di-dodecyl-esters, zinc salts, neutral and basic

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.004 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.04 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

PNEC marine water (intermittent releases):

0.004 mg/L

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

200 mg/L

Assessment factor:

1

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.408 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.041 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:

0.079 mg/kg soil dw

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Conclusion on classification

Classification related information

Biodegradation: Not readily biodegradable according to the OECD criteria (<5% degradation after 27 d, EU Method C.6).

Bioaccumulation:  The substance has a log Kow of 3.4 (the logPow from the neutral forms at 25 °C and pH 6.95 according to OECD 117, HPLC Method). Therefore it is expected to have low bioaccumulation potential. This substance does not meet the criteria of concern for bioaccumulation.

Aquatic acute toxicity

- Fish (freshwater): LL50 (96 h) = 4.4 mg/L (OECD 203, Oncorhynchus mykiss, mortality, nominal) (Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate) was used as read-across substance)

- Aquatic invertebrates (freshwater): EL50 (48 h) = 75 mg/L (Daphnia magna, OECD 202, nominal) (Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate) was used as read-across substance)

- Algae (freshwater): ErL50 (48 h) = 410 mg/L (Desmodesmus subspicatus, OECD 201, nominal) (Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate) was used as read-across substance)

Aquatic chronic toxicity

- Algae (freshwater): NOEC (72 h) = 220 mg/L (Desmodesmus subspicatus, OECD 201, nominal) (Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate) was used as read-across substance)

Conclusion on Classification

No data for aquatic toxicity are available for the target substance Phosphorodithioic acid, O,O-di-dodecyl-esters, zinc salts, neutral and basic (CAS No.4563-56-8). Therefore, a read-across approach has been applied. In accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006. Aquatic toxicity data of the structurally similar source substance was used to fulfill the standard information requirements set out in Annex VIII. Acute and chronic data on the toxicity to aquatic organisms are available for three and two trophic levels, respectively.

Based on the read-across worst case concept the following properties and effect values were considered for classification of Phosphorodithioic acid, O,O-di-dodecyl-esters, zinc salts, neutral and basic (CAS No.4563-56-8): not rapidly degradable, lowest available acute value of 4.4 mg/L, the lowest available chronic value is 220 mg/L. Therefore, Phosphorodithioic acid, O,O-di-dodecyl-esters, zinc salts, neutral and basic (CAS No.4563-56-8) is classified and labelled as Category Chronic 2 for environmental hazards according to the consolidated version of Regulation (EC) No 1272/2008 (dated: 01.01.2017) and further amendments (ATPs).