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Extensive reviews and study citations on the environmental behaviour of 4 -Nitrophenol have been published (BUA report No.75 1992, IPCS CICAD 2000, ECB IUCLID 2000):

The major partition of 4 -Nitrophenol is expected to be particle bound and therefore only to a minor extent available for photochemical reactions. Thus, most of the 4 -Nitrophenol can be washed out from air by wet and dry deposition (IPCS CICAD 2000). A half-life for the reaction with 4 -Nitrophenol with OH-radicals in the atmosphere was calculated to be 3.7.

Measured half-lives for the photochemical decomposition of 4 -Nitrophenol in water exposed to sunlight ranged from 2.8 to 13.7 days (Hustert et al. 1981, Mansour 1996) being longer with increasing pH (Hustert et al. 1981). Traces of 4 -Aminophenol were found as photoproduct in river water (Mansour 1996).

In experiments conducted according to OECD guidelines, Andrae et al. (1981) and Koerdel et al (1981) found no hydrolysis of 4 -Nitrophenol under environmental conditions (IPCS CICAD 2000).