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Environmental fate & pathways

Biodegradation in soil

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Description of key information

No biodegradation studies in soil are available for dipropylene glycol methyl ether acetate.

Key value for chemical safety assessment

Additional information

Dipropylene glycol methyl ether acetate has a low potential for adsorption to soil, as indicated by the low adsorption coefficient to organic carbon (Koc=186 L/kg). The risk characterisation shows that the PEC/PNEC ratios for soil are clearly < 1, indicating no need for further information or testing. Based upon its structural similarity to propylene glycol methyl ether acetate (PMA), dipropylene glycol methyl ether acetate (DPMA) is not considered to be persistent in soils. Both PMA and PM, the corresponding propylene glycol methyl ether, have shown rapid biodegradation. For example, rapid degradation of PMA to PM and acetate has been observed in 3 soil types. The degradation half-life of PMA was < 1, with the subsequent degradation (i.e. mineralisation) of the formed PM within 3 days (Dow, 1998). Since DPMA is structurally similar to PMA and considering that complete primary degradation of DPMA was observed in the MITI biodegradation study (Dow, 2000), it is expected to degrade in soil. According to REACH Annex IX requirements, soil simulation testing shall only be considered for substances with a high potential for adsorption to sediment or when the chemical safety assessment indicates the need for further investigations. Hence, a simulation test soil can be waived for dipropylene glycol methyl ether acetate.