Disodium 4-nitrophenyl phosphate

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12 October 2017 - 24 January 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Disodium 4-nitrophenyl phosphate

EC Number:

224-246-5

EC Name:

Disodium 4-nitrophenyl phosphate

Cas Number:

4264-83-9

Molecular formula:

C6H4NO6P.2Na

IUPAC Name:

disodium 4-nitrophenyl phosphate

impurity 1

Reference substance name:

Water

EC Number:

231-791-2

EC Name:

Water

Cas Number:

7732-18-5

Molecular formula:

H2O

IUPAC Name:

Oxidane

Test material form:

solid

Details on test material:

Batch Nr: 11674900
Storage: 2-8°C.

Results and discussion

Boiling point

Key result

Atm. press.:

1 013 hPa

Decomposition:

yes

Remarks:

no boiling point up to its decomposition temperature

Decomp. temp.:

<= 220 °C

Any other information on results incl. tables

In the temperature range of 50 – 140 °C, an endothermic effect with two peaks was observed, which was followed by a second endothermic effect in the temperature range of 130 – 160 °C. Both endothermic effects cannot be assigned to the melting of the test item. Two small exothermic effects were detected in the temperature ranges of 170 – 200 °C and 290 – 350 °C, with an overall decomposition energy of approx. -50 J/g. No further thermal effects were observed up to the test end temperature of 500 °C.

To verify the results of the DSC measurement, two additional measurements with the capillary method (Apparatus: Stuart Melting Point SMP30) were performed in the temperature range of 25 – 350 °C with a heating rate of 10 K/min. According to the observations during the test with the capillary method, the endothermic effects in the temperature range of 50 – 160°C in the DSC measurements cannot be assigned to the melting of the test item. Starting at a temperature of 50 °C the test item changed its crystalline structure and changed its colour from light yellow to dark yellow starting at a temperature of approx. 90 °C. A further change in colour from dark yellow to brown could be observed from a temperature of 220 °C. Between 250 – 270 °C the test item turns black. Due to this result, the test item has no melting and boiling point before its decomposition starting at a temperature of about 220 °C.

Applicant's summary and conclusion

Conclusions:

The test item 4-Nitrophenyl phosphate disodium salt (CAS no. 4264-83-9) has no boiling point up to its decomposition starting at a temperature of approx. 220 °C at atmospheric pressure (1016 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).

Executive summary:

The test item 4-Nitrophenyl phosphate disodium salt (CAS no. 4264-83-9) has no boiling point up to its decomposition starting at a temperature of approx. 220 °C at atmospheric pressure (1016 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).