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Environmental fate & pathways

Biodegradation in soil

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
biodegradation in soil: simulation testing
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 1994-08-12 to 1995-06-29
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
The rate of degradation of Mecoprop-P, 2-ethylhexyl ester applied as a commercial formulation also containing ioxynil octanoate to sandy loam soil under aerobic conditions at 5°C was studied over 56 days.
GLP compliance:
yes
Remarks:
Analytical Chemistry Department Rhone-Poulenc Agriculture Limited Fyfield Road ONGAR Essex CM5 OHW England
Test type:
laboratory
Specific details on test material used for the study:
Purity: 99.1 % (equivalent to 296 g/L MCPP-P content)
Batch: PJS 289
Radiolabelling:
no
Oxygen conditions:
aerobic
Soil classification:
USDA (US Department of Agriculture)
Remarks:
Sandy Loam
Year:
1995
Soil no.:
#1
Soil type:
sandy loam
% Org. C:
0.9
pH:
7.3
CEC:
>= 0.2 - <= 9.4 meq/100 g soil d.w.
Details on soil characteristics:
SOIL COLLECTION AND STORAGE
- Geographic location: Aldham's Farm, Manningtree, Essex, UK
- Pesticide use history at the collection site: no pesticides has been applied in the last five years
- Soil preparation (e.g., 2 mm sieved; air dried etc.): glass dishes 7.5 cm in diameter each containing approximately 100g sandy-loam soil maintained at 75% of its moisture holding capacity at 1/3 bar
- Storage conditions: The dishes were kept in the dark in an environmental cabinet at 5 ± 1 °C.

PROPERTIES OF THE SOILS (in addition to defined fields)
- Moisture at 1/3 atm (%): 12.3
Soil No.:
#1
Duration:
56 d
Soil No.:
#1
Initial conc.:
5.18 mg/kg soil d.w.
Based on:
test mat.
Parameter followed for biodegradation estimation:
test mat. analysis
Soil No.:
#1
Temp.:
5 °C
Humidity:
75% moisture holding capacity of the soil
Microbial biomass:
194 µg/g
Soil No.:
#1
% Recovery:
82.13
Remarks on result:
other: 0 days
Soil No.:
#1
% Recovery:
77.07
Remarks on result:
other: 3 days
Soil No.:
#1
% Recovery:
82.99
Remarks on result:
other: 7 days
Soil No.:
#1
% Recovery:
86.51
Remarks on result:
other: 14 days
Soil No.:
#1
% Recovery:
74.69
Remarks on result:
other: 28 days
Soil No.:
#1
% Recovery:
61.69
Remarks on result:
other: 56 days
Key result
Soil No.:
#1
DT50:
8.3 d
Type:
(pseudo-)first order (= half-life)
Temp.:
5 °C
Transformation products:
yes
No.:
#1
No.:
#1
No.:
#1
Details on transformation products:
MCPP-P acid is the major degradation product under the conditions and time scale of this study.
Evaporation of parent compound:
not measured
Volatile metabolites:
not measured
Residues:
not measured
Conclusions:
It was concluded that in sandy loam soil at 5 °C under aerobic conditions, MCPP-P 2-EHE degrades to MCPP-P acid with a half-life of 8.3 days.
Executive summary:

A study has been carried out to determine the rate of degradation of MCPP-P 2-EHE in sandy loam soil under aerobic conditions at 5 °C for 56 days. The compound was applied to the soil as a commercial formulation ( MYLONE POWER Gel ) also containing ioxynil octanoate at the maximum recommended application rate. The moisture content of the soil was maintained at 75 % of moisture holding capacity at 1/3 bar.

The half-life of MCPP-P 2-EHE was calculated as 8.3 days and the major degradation product was MCPP-P acid.

Description of key information

In sandy loam soil at 5 °C under aerobic conditions, MCPP-P 2-EHE degrades to MCPP-P acid with a half-life of 8.3 days.

Key value for chemical safety assessment

Half-life in soil:
8.3 d
at the temperature of:
5 °C

Additional information

A study has been carried out to determine the rate of degradation of MCPP-P 2-EHE in sandy loam soil under aerobic conditions at 5 °C for 56 days. The compound was applied to the soil as a commercial formulation ( MYLONE POWER Gel ) also containing ioxynil octanoate at the maximum recommended application rate. The moisture content of the soil was maintained at 75 % of moisture holding capacity at 1/3 bar.

The half-life of MCPP-P 2-EHE was calculated as 8.3 days and the major degradation product was MCPP-P acid.