Fenamiphos

Stability: thermal, sunlight, metals

Administrative data

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1986

Report date:

1963

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Deviations:

no

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Fenamiphos

EC Number:

244-848-1

EC Name:

Fenamiphos

Cas Number:

22224-92-6

Molecular formula:

C13H22NO3PS

IUPAC Name:

{ethoxy[3-methyl-4-(methylsulfanyl)phenoxy]phosphoryl}(propan-2-yl)amine

Test material form:

solid: crystalline

Results and discussion

For thermal stability study

Test substance thermally stable:

yes

Transformation products:

not measured

For study on stability to sunlight

Test substance stable to sunlight:

not determined

For study on stability to metals

Test substance stable to metals / metal ions:

not determined

Any other information on results incl. tables

DTA Measurements

20.1 mg of sample were weighed into the sample container. When measured at a heating rate of 3 K/min, melting can be observed in the temperature range 30 to 80 °C. The beginning of a measurable exothermic decomposition, which has its maximum at 270 °C and is finished at approx. 300 °C, occurs at 220 °C. The total decomposition heat is approx. 180 kJ/kg. The beginning of a further exothermic decomposition can be observed from 360 °C.

TGA Measurements

25 mg of sample were weighed into a platinum basket. The measurements were performed in an atmosphere of air as well as of nitrogen at a heating rate of 5 K/min. In both cases a complete weight loss occurs in the temperature range 140 °C to 260 °C.

Applicant's summary and conclusion

Conclusions:

Based on the obtained results, the substance may be considered stable at room temperature.

Executive summary:

The test item was tested for thermal stability in accordance with OECD 113. DTA measurements were performed in a closed glass ampoule at a heating rate of 3 K/min and TGA measurements were conducted in an open vessel in an atmosphere of air as well as of nitrogen at a heating rate of 5 K/min. In the DTA measurements, an endothermic (melting) but not an exothermic effect (decomposition) takes place below 150 °C. A weight loss (evaporation, sublimation), commencing at a temperature of 140 °C, is evident in the TGA measurements in an atmosphere of air as well as of nitrogen.
Based on these results, the substance may be considered stable at room temperature.