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According to the criteria set in Annex XI of REGULATION (EC) No 1907/2006 a ready biodegradation study is scientifically unnecessary based on the following arguments applied for the Naphtol AS Pigments. Since it is generally known that pigments are not or only marginally (bio)degradable, the Persistance-criterion is accepted for Naphtol AS pigments. Therefore only one biodegradation study was performed. As Naphtol AS Pigments are of very poor water solubility, rather inherent than ready biodegradability was assessed for Pigment Red 210 in the Modified MITI Test (II) according to OECD 302 C. The substance was not inherently biodegradable.


In a reliable study using the HPLC-method according to OECD 121 for estimating the adsorption coefficient Koc on soil and sewage sludge, for the test item a log Koc of >5.0 was determined. The reference substance of highest log Koc used was DDT (log Koc 5.63). The linear regression from the calibration curve gives a solid result with R^2= 0.9869. Thus, by linear extrapolation a log Koc of 6.2 was estimated for the test item.


 


 

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