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Environmental fate & pathways

Biodegradation in soil

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Reference
Endpoint:
biodegradation in soil
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study based on scientific principals, sufficiently documented.
Qualifier:
no guideline available
Principles of method if other than guideline:
Field test with 3 different soil types
GLP compliance:
not specified
Test type:
laboratory
Radiolabelling:
yes
Oxygen conditions:
not specified
Soil classification:
not specified
Soil no.:
#1
Soil type:
clay
Soil no.:
#2
Soil type:
sand
Soil no.:
#3
Soil type:
loam
Soil No.:
#1
Initial conc.:
1.7 mg/kg soil d.w.
Based on:
act. ingr.
Soil No.:
#2
Initial conc.:
1.7 mg/kg soil d.w.
Based on:
act. ingr.
Soil No.:
#3
Initial conc.:
1.7 mg/kg soil d.w.
Based on:
act. ingr.
Parameter followed for biodegradation estimation:
test mat. analysis
Temp.:
20 °C
Details on experimental conditions:
Elimination of NMP from three types of soils (clay, loam, and sand) placed in mini-vials was examined. 10-g soil samples (n = 3) were removed at time intervals of 0, 1, 3, 7, 14, 21, and 28 days and 2 and 3 months and extracted (methanol) for analysis.
Soil No.:
#1
DT50:
4 d
Type:
(pseudo-)first order (= half-life)
Remarks on result:
other: clay
Soil No.:
#2
DT50:
11.5 d
Type:
(pseudo-)first order (= half-life)
Remarks on result:
other: sand
Soil No.:
#3
DT50:
8.7 d
Type:
(pseudo-)first order (= half-life)
Remarks on result:
other: loam
Transformation products:
not measured
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
yes
Details on results:
After 21 d, the levels of extractable NMP were below 0.1 mg/kg soil.

RS-Freetext:
Elimination half-lives in clay, loam and sand were about
4.0, 8.7, and 11.5 days, resp. After 21 d, the levels of
extractable NMP were below 0.1 mg/kg soil (= >90% degradation).
Conclusions:
The test substance is eliminated in soils. Calculated half-lifes are in the range of 4.0 to 11.5 days.
Executive summary:

Elimination of NMP from three types of soils (clay, loam, and sand) placed in mini-vials was examined. 10-g soil samples (n = 3) were removed at time intervals of 0, 1, 3, 7, 14, 21, and 28 days and 2 and 3 months and extracted (methanol) for analysis.  After 21 d, the levels of  extractable NMP were below 0.1 mg/kg soil (= >90% degradation).

Calculated half-lifes are 4.0, 8.7 and 11.5 days for clay, loam and sand, respectively.

Description of key information

The test substance is eliminated in soils. Calculated half-lifes are in the range of 4.0 to 11.5 days.

Key value for chemical safety assessment

Half-life in soil:
11.5 d

Additional information

The test substance is eliminated in soils. Calculated half-lifes are in the range of 4.0 to 11.5 days.