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EC number: 204-794-1
CAS number: 126-58-9
Di-Pentaerythritol is not regarded as readily biodegradable or inherently degradable.
According to REACH Regulation (EC) No. 1907/206, Annex IX, Sections 126.96.36.199 and 188.8.131.52, simulation testing for the sediment and soil is only suggested for substances that have a potential for adsorption to soil. For Annex VI and XI substances a high potential to absorb is classified as a Log Kow of >5 or a Log Koc of >3. The substance has a log Kow of -1.8 (Log Koc not available), and therefore is not deemed to be highly adsorptive substance.
In accordance with REACH Regulation (EC) No. 1907/206, Annex IX, Section 184.108.40.206 for substances manufactured above 100 tpa, an Aerobic Mineralization in Surface Water- Simulation Biodegradation test is proposed for Di-Pentaerythritol.
The potential for biodegradation of di-pentaerythritol was determined in a study according to SS-EN ISO 7827:1996/OECD 301 A. The quantity of test substance DOC that was degraded in this study was less than 20%. According to OECD guidelines for testing chemicals, a test compound is regarded as easily biodegradable if the loss of DOC within 28 days is greater than 70 %. This criterion was not reached for the test article and, as such, Di-Pentaerythritol cannot be regarded as readily biodegradable.
In a further supportive study, the aerobic biodegradability of di-pentaerythritol was investigated in a study with methodology closely corresponding to OECD 301 D. The results of this study suggested that little biodegradation took place during the test period.
Additionally, the inherent biodegradability of Dipentaerythritol was assessed over a 28 day period by the Modified Zahn-Wellens Test. The test was designed to comply with the requirements of OECD (1992) Guideline 302B. Dipentaerythritol was introduced to the test system at an addition rate of 400 mg DOC/L (Dissolved Organic Carbon/L). The reference item (aniline) was introduced to the test system at 400 mg DOC/L. The reference substance (aniline) was degraded by 99.5 % within 28 days. The test item is not considered to be inhibitory to the microbial inoculum as 55.2% biodegradation was observed in the toxicity control bioreactor (containing 400 mg DOC/L of test and reference items) on Day 28. Dipentaerythritol did not show signs of inherent biodegradability under the conditions of the test as the test item biodegraded by 25.0% during the 28 day test. According to the guideline, Dipentaerythritol is not inherently biodegradable.
Given these results Di-Pentaerythritol cannot be considered to be readily biodegradable, inherently biodegradable, or rapidly removed in the STP.
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