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Environmental fate & pathways

Biodegradation in soil

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According to the TNsG on data requirements (p. 107), this study is required provided the biocide is directly applied /emitted to soil.  
This is confirmed by Figure 1 (p. 108) (TNsG) which shows that soil studies are required only where the STP partition coefficient is >5000. Hence, emissions to the soil via sewage sludge is considered insignificant unless Kp > 5000.
Chloramine B trihydrate is not inteded for direct use on soils, but it is used in industrial, professional and private facilities. Hence a direct contamination of soil is unlikely.
Indirect contamination of the soil environment is unlikely, too, for the following reasons.
Chloramine B trihydrate is not biodegradable (see DOC IIIA 7.1.1.2). However, during its application and its discharge in wastewaters, complete degradation occurs by fast dechlorination (see DOC III-A_7.3.3_1 and DOC III-A_7.3.3_2), The dechlorinated form of Chloramine B, benzenesulphonamide (BSA), is readily biodegradable (see DOC IVA / A29 and A30). Hence at the proposed use concentrations, chloramine B trihydrate degrades completely and does not enter the environment.
As the substance – via fast dechlorination to its metabolite BSA – is readily biodegradable, further investigations with respect its its fate in soil ecosystems are obsolete.

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