Registration Dossier

Environmental fate & pathways

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:
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

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: soluble lead

Results and discussion

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. This conclusion is critical to the chronic environmental 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