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Environmental fate & pathways

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Biodegradation :

Biodegradation in water: screening tests :

Weight of evidence studies reviewed for biodegradation in water from reliable sources having Klimish rating 2.

The summary of the results is presented below:

Sr.No

Endpoint

Half-life

Remark

Sources

1

Biodegradation in water

-

Not readily biodegradable

Predicted data of Target chemical

2

Biodegradation in water

-

Not Readily biodegradable

Data is from database from CAS NO 91-66-7

 

Based on the study and predicted data, it is concluded that the chemical is persistent in water medium

Biodegradation in water and sediment :

As per biowin model N,N-dimethyl-p-toluidine is not readily biodegradable in water as the Biowin3 (ultimate survey model) result is p = 2.5707 months ( if in days or weeks then readily biodegradable), AND the Biowin5 (MITI linear model) probability is p= 0.3002 ( less than 0.5 is not readily biodegradable), while on the basis of fugacity model half life of N,N-dimethyl-p-toluidine in sediment is 337.5 days (8100 hrs.).Based on these half life values of it is concluded that N,N-dimethyl-p-toluidine is non biodegradable in sediment. However, since there is negligible diffusion of the substance in the sediment medium as evident from the reported data (0.175%) and hence persistence in the sediment compartment is not likely to be critical.

Biodegradation in soil :

Based on level III fugacity model halflife period ofN,N-dimethyl-p-toluidine was estimated.

Half life period of N,N-dimethyl-p-toluidine in Soil was observed to be 75 days which does not exceeds the threshold criteria of 120 days. Based on these half life values it is concluded that N,N-dimethyl-p-toluidine is readily biodegradable (not persistent) in Soil medium

Media

Half life

(Days)

% in medium

Soil

75

78

 

 

Media

Half life

(hrs)

% in medium

Emissions

 (kg/hr)

Soil

1800

78

1000