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Environmental fate & pathways

Hydrolysis

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Reference
Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Principles of method if other than guideline:
All photocatalytic degradation experiments were performed in a batch, recirculating annular ring photoreactor (Blake et al., 1995).
GLP compliance:
not specified
Radiolabelling:
yes
Analytical monitoring:
yes
Transformation products:
yes
No.:
#1
No.:
#2
No.:
#3
No.:
#4
No.:
#5
Remarks on result:
not measured/tested

Byproducts from the photocatalytic reduction of TNT (at pH 3.1 to 6.6 under a nitrogen atmosphere) were observed: 4-amino-2,6 -dinitrotoluene, 2,4 -diamino-6 -nitrotoluene, 4 -hydroxylamino-2,6 -dinitrotoluene, 2,4 -dihydroxylamino-6-nitrotoluene, and 2 -hydroxylamino-4 -amino-6 -nitrotoluene. The extent of TNT mineralization was approximately 14% by biological transformation alone and improved to approximately 32% using the combined photocatalytic and fungal treatment.

When the initial pH was lowered to 3.1 using a combination of acid-form EDTA and disodium EDTA the final pH was 6.6 and no azoxynitrotoluenes were detected.

Description of key information

Byproducts from the photocatalytic reduction of TNT (at pH 3.1 to 6.6 under a nitrogen atmosphere) were observed: 4-amino-2,6 -dinitrotoluene, 2,4 -diamino-6 -nitrotoluene, 4 -hydroxylamino-2,6 -dinitrotoluene, 2,4 -dihydroxylamino-6-nitrotoluene, and 2 -hydroxylamino-4 -amino-6 -nitrotoluene. The extent of TNT mineralization was approximately 14% by biological transformation alone and improved to approximately 32% using the combined photocatalytic and fungal treatment.

Key value for chemical safety assessment

Additional information