Phthalimide

Biodegradation in soil

Administrative data

Endpoint:

biodegradation in soil, other

Type of information:

experimental study

Adequacy of study:

other information

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Title:

Effects of light on the organophosphorus pesticides bromophos and iodofenphos and their main degradation products examined in rainwater and on soil surface in a long-term study

Author:

Allmaier GM and Schmid ER

Year:

1985

Bibliographic source:

J. Agric. Food Chem. 33, 90-92.

Materials and methods

Principles of method if other than guideline:

Method: incubation in radiation apparatus

GLP compliance:

no

Test type:

laboratory

Test material

Test material information

Constituent 1

Reference substance name:

Phthalimide

EC Number:

201-603-3

EC Name:

Phthalimide

Cas Number:

85-41-6

Molecular formula:

C8H5NO2

IUPAC Name:

1H-isoindole-1,3(2H)-dione

Details on test material:

Test Substance: Ditalimfos, > 99.5 % purity, purchased from Dow Chemical Company
Phthalimide was identified to be a degradation product of Ditalimfos, and its degradation was also followed during the study.

Study design

Soil classification:

other: Speyer Standard Soil

Soil properties

% Clay:

8.8

% Silt:

6.5

% Sand:

84.8

% Org. C:

2.6

pH:

5.8

Experimental conditions

Temp.:

25 °C

Humidity:

12 g water/100g soil dry weight

Results and discussion

% Degradation

% Degr.:

100

Sampling time:

36 d

Any other information on results incl. tables

In both illuminated and non-illuminated test systems phthalimide reached  its concentration maximum after 12 days and was completely removed after  another 36 days

The same main degradation products were found regardless of the light  conditions: 0,0-diethyl-phosphoro-amidothioate (main product) and  phthalimide.
Ditalimfos t1/2 = 428 h (illuminated soil)
Ditalimfos t1/2 = 442 h (nonilluminated soil)
Phthalimide reached the maximum after 12 days. Phthalimide could not be  detected after 48 days in both soils. Ditalimfos was not detectable in  both test systems after 96 days.