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Environmental fate & pathways


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Description of key information

1,3-diphenylguanidine is considered as hydrolytically stable. It should be noted that the newly discovered ready biodegradability of the substance could have allowed to waive the hydrolysis study.

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Additional information

Wohlfahrt, R. & Niebergall, H. (1984 and 1985) investigated the hydrolytic properties of DPG (0.3 g/l or 0.3 wt.% in water) in relation to the pH value at 80°C. In an acidic environment (pH 3.5) no recognizable hydrolysis of the original substance took place over a period of 500 hours. In the neutral range (pH 7) only 18.1% of DPG was hydrolyzed after 1000 hours. To investigate if DPG is hydrolysable, an OECD 111 study was conducted at pH 4 - 7 - 9. From the results, it can be concluded that the substance is stable in water at environmental pH.