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Environmental fate & pathways

Endpoint summary

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Aquatic bioaccumulation


An uptake of all analyzed compounds C18_ATQ, C20_ATQ and C22_ATQ of the test item in fish was observed. Since no steady-state phase was reached during uptake, no steady-state bioconcentration factors were calculated. The kinetic bioconcentration factors have been calculated based on fish body weight and time-weighted average mean measured concentrations of the test item compounds C18_ATQ, C20_ATQ and C22_ATQ in water during uptake phase.


The results showed an ambiguous finding regarding the carbon chain length. Due to the high adsorption of the test substance it can be assumed that a certain amount of the substance is adsorbed on the fish skin. In order to differentiate between the fraction on the fish skin and the fraction in the fish fillet, further investigations were necessary. The results of this distribution in fish (fillet and skin) ends in the following BCFs


 
































Nominal test concentration [µg/L]



5.00



20.0



BCFKGL



C18_ATQ



1787



957



C20_ATQ



1263



920



C22_ATQ



691



351



Weighted BCFKGL
[L * kg-1]



835



465



 


All BCFs of the 3 chain lengths and of the two concentrations are below 2000.


 


Terrestrial bioaccumulation                                                                                   


 


C20/22 ATQ is a quaternary substance and positively charged. It is known that ionic compound has a low potential to cross membranes. In addition, C20/22 ATQ has a low measured Log Kow of 3.3 (see IUCLID Section 4.7) and therefore a bioaccumulation potential in soil is unlikely. It can be concluded that the substance is rapidly biodegraded/transformed in soils (see IUCLID Section 5.2.3). The half-life determined from three different soils for C22-ATQ was 28.5 days (geometric mean).


 

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