EU-SICHERHEITSDATENBLATT Dieselkraftstoff ... - Schmierstoffe

EU-SICHERHEITSDATENBLATT Dieselkraftstoff ... - Schmierstoffe EU-SICHERHEITSDATENBLATT Dieselkraftstoff ... - Schmierstoffe

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10000 Experimental BCF 1000 100 10 nP Dietary BCF nP Aqueous BCF B vB 1 5 10 15 20 25 30 Carbon Number Figure 23. Experimentally derived fish BCFs for n-paraffins. B – 2000, vB - 5000 Experimental BMF 10 1 0.1 nP Dietary BMF BMF = 1 0.01 5 10 15 20 Carbon Number Figure 24. Experimentally derived fish BMFs for n-paraffins from dietary bioaccumulation studies 4.2 Iso-paraffins Regression method BCF predictions for iso-paraffins (Figure 25) are above the B criterion of 2000 for structures ranging from C11 to C16. Above these carbon chain lengths, BCF values decrease below 2000. When biotransformation is incorporated into the model, none of the iso-paraffin BCF predictions are above 2000 (Figure 26). Experimental BCF values for iso-paraffins range from 673 (aqueous) to 6004 (dietary). Dietary BCF values, which are typically more conservative than aqueous BCF values, are above the B criterion for selected C9, C11 and C12 structures. Aqueous BCF data for 2,2,4,6,6-pentamethylheptane which is a highly branched, atypical structure indicates the B criterion maybe fulfilled (Figure 27). For all tested C13, C15 and C16 structures dietary calculated BCFs exceed 2000 (Table 12). However, reliable aqueous BCF data for C15 and C16 structures indicate these compounds do not fulfill the B criterion but do 32

exhibit BMFs near unity (Figure 28). It can be concluded that based on the available data, C12-C16 iso-paraffins may be bioaccumulative (B), but not very bioaccumulative (vB). BCF (regression) 100000 10000 1000 100 10 i-Paraffins B vB 1 0 5 10 15 20 25 30 35 Carbon Number Figure 25. Predicted fish BCFs for iso-paraffins using the regression-based approach in BCFBAF. B – 2000, vB - 5000 10000 BCF (Arnot) 1000 100 10 i-Paraffins B vB 1 0 0 5 10 15 20 25 30 35 Carbon Number Figure 26. Predicted fish BCFs for iso-paraffins using Arnot’s equations incorporating metabolism (Arnot and Gobas 2003). B – 2000, vB - 5000 33

exhibit BMFs near unity (Figure 28). It can be concluded that based on the available<br />

data, C12-C16 iso-paraffins may be bioaccumulative (B), but not very bioaccumulative<br />

(vB).<br />

BCF (regression)<br />

100000<br />

10000<br />

1000<br />

100<br />

10<br />

i-Paraffins<br />

B<br />

vB<br />

1<br />

0 5 10 15 20 25 30 35<br />

Carbon Number<br />

Figure 25. Predicted fish BCFs for iso-paraffins using the regression-based approach in<br />

BCFBAF. B – 2000, vB - 5000<br />

10000<br />

BCF (Arnot)<br />

1000<br />

100<br />

10<br />

i-Paraffins<br />

B<br />

vB<br />

1<br />

0<br />

0 5 10 15 20 25 30 35<br />

Carbon Number<br />

Figure 26. Predicted fish BCFs for iso-paraffins using Arnot’s equations incorporating<br />

metabolism (Arnot and Gobas 2003). B – 2000, vB - 5000<br />

33

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