N-(carboxymethyl)-N-(phosphonomethyl)glycine

Biodegradation in soil

Administrative data

Endpoint:

biodegradation in soil

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

Not reported

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for data waiving:

other:

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

1977

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 304 A (Inherent Biodegradability in Soil)

Deviations:

yes

Remarks:

, Duration

Principles of method if other than guideline:

Not applicable

GLP compliance:

no

Test type:

laboratory

Test material

Test material information

Constituent 1

Reference substance name:

N-(carboxymethyl)-N-(phosphonomethyl)glycine

EC Number:

227-824-5

EC Name:

N-(carboxymethyl)-N-(phosphonomethyl)glycine

Cas Number:

5994-61-6

Molecular formula:

C5H10NO7P

IUPAC Name:

2-[(carboxymethyl)(phosphonomethyl)amino]acetic acid

Details on test material:

- Name of test material (as cited in study report): Glyphosate (N-phosphonomethylglycine)
- Substance type: Pure active substance

- Name of test material (radiolabeled) 1: N-Phosphono-14C-methylglycine
- Specific activity (if radiolabelling): 8.03mCi/mmol

- Name of test material (radiolabeled) 2: N-Phosphonomethylglycine-1-14C
- Specific activity (if radiolabelling): 10.02 mCi/mmol
- Purity: 94.8 %
- Impurities (identity and concentrations): aminomethylphosphonic acid: 4.3 %; N-methylaminomethylphosphonic acid: 0.8 % and methylphosphonic acid: 0.1%

- Name of test material (radiolabeled) 3: N-Phosphonomethylglycine-2-14C
- Specific activity (if radiolabelling): 9.40 mCi/mmol

- Name of test material (radiolabeled) 4: N-Phosphono-12C-methyl, glycine-2-14C
- Purity: 97.7 %
- Specific activity (if radiolabelling): 9.40 mCi/mmol

Specific details on test material used for the study:

Details on properties of test surrogate or analogue material (migrated information):
Not applicable

Radiolabelling:

yes

Study design

Oxygen conditions:

aerobic/anaerobic

Soil classification:

not specified

Soil properties

Soil properties 1

Soil no.:

#1

Soil type:

silt loam

% Clay:

0.6

% Silt:

82.3

% Sand:

6

% Org. C:

1

pH:

6.5

Soil properties 2

Soil no.:

#2

Soil type:

silty clay loam

% Clay:

36.8

% Silt:

55.4

% Sand:

2

% Org. C:

6

pH:

7

Soil properties 3

Soil no.:

#3

Soil type:

sandy loam

% Clay:

2.3

% Silt:

11.1

% Sand:

86.6

% Org. C:

1.1

pH:

6.5

Soil properties 4

Soil no.:

#4

Soil type:

sandy loam

% Clay:

2.3

% Silt:

11

% Sand:

86

% Org. C:

1

pH:

5.7

Details on soil characteristics:

No data

Duration of test (contact time)

Duration:

7 d

Initial test substance concentration

Soil No.:

#1

Initial conc.:

4.5 other: g dry weight

Based on:

test mat.

Parameter followed for biodegradation estimation:

CO2 evolution

Details on experimental conditions:

No data

Results and discussion

% Degradation

% Degradation 1

Soil No.:

#1

% Degr.:

2.2

Parameter:

CO2 evolution

Sampling time:

28 d

% Degradation 2

Soil No.:

#1

% Degr.:

1.4

Parameter:

CO2 evolution

Sampling time:

28 d

Transformation products:

yes

Identity of transformation products

No.:

#1

Reference

Reference substance name:

Unnamed

IUPAC name:

Aminomethylphosphonic acid

Identifier:

common name

Identity:

Aminomethylphosphonic acid

Details on transformation products:

No data

Evaporation of parent compound:

no

Volatile metabolites:

no

Residues:

no

Details on results:

TEST CONDITIONS
- Aerobicity, moisture, temperature and other experimental conditions maintained throughout the study: Yes
- Anomalies or problems encountered (if yes): No


VOLATILIZATION
- % of the applied radioactivity present as volatile organics at end of study: 98.4 % after 48 h

Results with reference substance:

No data

Any other information on results incl. tables

None