Trilead dioxide phosphonate

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

calculation (if not (Q)SAR)

Remarks:

estimated by calculation

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The estimation are based on model that has been developed to assess the long-term fate and effects of metals in the environment.

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Lead addition was modeled in the TICKET-UWM simulations as a single instantaneous load addition and the removal from the water column was assessed generically simulating a standard lake environment (EUSES). The physical parameters of the generalized lake are based on regional distribution parameters from the EUSES program (RIVM, 2004). Specifically, time variable TICKET-UWM simulations were performed to assess lead removal from the water column relative to the definition of rapid removal for soluble metals of greater than 70% removal in a 28-day period (Institute for Health and Consumer Protection, 2009). In addition, potential remobilization of Pb from the anoxic/oxic sediment to the water column was also assessed.

GLP compliance:

no

Type of study / information:

Model calculations

Test material

Test material information

Constituent 1

Reference substance name:

Lead

EC Number:

231-100-4

EC Name:

Lead

Cas Number:

7439-92-1

Molecular formula:

Pb

IUPAC Name:

lead

Test material form:

other: soluble lead

Applicant's summary and conclusion

Conclusions:

It can therefore be concluded that for typical conditions in Europe, lead-ions are rapidly removed from the water-column (>70% within 28 days). Moreover, remobilization of Pb from the sediments to the water column is insignificant.

Note that, because of a lack of scientific consensus on the use of rapid removal concepts for the purpose of classification and labelling, the substance was assumed to not be readily biodegradable (i.e. no rapid environmental transformation) when setting M factors and in self-classification.

Executive summary:

Time variable TICKET-UWM simulations were performed to assess lead removal from the water column relative to the definition of rapid removal for soluble metals of greater than 70% removal in a 28-day period. The following conclusion could be formulated:

-         For a standard lake environment consisting of the EUSES model lake parameters, lead removal from the water column satisfies the definition for rapid removal of 70% dissolved lead removal in 28 days; 

-          For a standard lake environment consisting of the EUSES model lake parameters, assessed at pH 6 to 7, lead removal from the water column satisfies the definition for rapid removal of 70% dissolved lead removal in 28 days;

-        The potential for remobilization from anoxic and oxic sediments, quantified by comparing water column lead concentrations resulting from sediment feedback to the 70% removal concentration, is insignificant