Ethoprophos

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 2000-07-28 to 2000-08-16

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2001

Report date:

2001

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Ethoprophos

EC Number:

236-152-1

EC Name:

Ethoprophos

Cas Number:

13194-48-4

Molecular formula:

C8H19O2PS2

IUPAC Name:

ethyl bis(propylsulfanyl)phosphinate

Test material form:

liquid

Reference

Constituent 1

Reference substance name:

Ethoprophos

EC Number:

236-152-1

EC Name:

Ethoprophos

Cas Number:

13194-48-4

Molecular formula:

C8H19O2PS2

IUPAC Name:

ethyl bis(propylsulfanyl)phosphinate

Test material form:

liquid

Results and discussion

Boiling point

Boiling point 1

Key result

Boiling pt.:

>= 244.6 °C

Decomposition:

yes

Decomp. temp.:

ca. 260 °C

Remarks on result:

other: Technical test substance. Atmospheric pressure not reported.

Boiling point 2

Key result

Boiling pt.:

>= 244.3 °C

Decomposition:

yes

Decomp. temp.:

ca. 260 °C

Remarks on result:

other: Purified test substance. Atmospheric pressure not reported.

Any other information on results incl. tables

Purified Active

The sample mass tested was 7.95 mg. The thermogram shows a broad endotherm starting at 244.3 °C with a peak at 258.7 °C (onset at 259.3 °C), immediately followed by a sharp exotherm, representing a boiling point with decomposition.

Results from the scan are detailed in Table Definitive Boiling Point (Purified Active):

Endotherm properties

Left Limit	°C	244.3
Onset	°C	259.3
Peak	°C	258.7
Endset	°C	258.9
Enthalpy	J/g	-142.1

Exotherm Properties

Onset	°C	258.7
Peak	°C	258.7
Endset	°C	260.1
Enthalpy	J/g	-7.6

 

Technical Active
The sample mass tested was 7.55 mg. The thermogram shows three thermal events between 245 and 261 °C. The first was a broad endotherm which started at 244.6 °C, with an interpolated onset at 259.6 °C. The second was a sharp endotherm and was immediately followed by a very sharp exotherm at 260.9 °C.
Results from the scan are detailed in Table:

Endotherm 1 properties

Left Limit	°C	244.6
Onset	°C	259.6
Peak	°C	260.1
Endset	°C	260.1
Enthalpy	J/g	-91.3

Endotherm 2 properties

Onset	°C	260.3
Peak	°C	259.6
Endset	°C	260.9
Enthalpy	J/g	-31.9

Exotherm properties

Onset	°C	260.9
Peak	°C	260.9
Endset	°C	261.0
Enthalpy	J/g	+4.8

After all tests, a black carbon-like stain was observed in the pans. These events were considered characteristic of a boiling point with decomposition.

Applicant's summary and conclusion

Conclusions:

The boiling characteristics of test substances (purified and technical actives) were
evaluated by DSC to be as follows:
Purified Active: Boiling starts at 244.3°C (517.5 K) and is accompanied by decomposition
Technical Active : Boiling starts at 244.6°C (517.8 K) and is accompanied by decomposition

Executive summary:

An experimental study was performed to determine the boiling point of the test item according to EU Method EEC A2 and OPPTS 830.7220 using Differential scanning calorimetry.
Purified Active Ingredient: The boiling starts at 244.3°C (517.5 K) and is accompanied by decomposition.
Technical Active Ingredient: The boiling starts at 244.6°C (517.8 K) and is accompanied by decomposition.