Nitrilotrimethylenetris(phosphonic acid)

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Testing was conducted between 31 March 2010 and 4 June 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive and done to a valid guideline.

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

451 K

Decomposition:

yes

Sublimation:

no

Remarks on result:

other: No atmospheric pressure was recorded for this endpoint.

Please see Attachment 1 as this information contains tables and graphs and it would be rendered less comprehensible separated within this section.

Conclusions:

The test item has been determined to melt with decomposition from approximately 451 K.

Executive summary:

INTRODUCTION

Methods employed are designed to be compatible with those specified in Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A: Methods for the determination of physico-chemical properties.

Method

The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86 designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Conclusion

The test item has been determined to melt with decomposition from approximately 451 K.

Description of key information

Melting point [ATMP-H]: The anhydrous form of the substance (ATMP-H) was observed to undergo thermal decomposition from approximately 178°C (451 K) (Tremain 2010).

Additional information

The melting point of the solid anhydrous form of ATMP-H was determined using differential scanning calorimetry (DSC) in accordance with EU Test Method A.1. ATMP-H (anhydrous form) was observed to undergo thermal decomposition from approximately 178°C (451 K). In addition to the DSC method, a visual assessment of melting temperature was performed using a metal block technique. In this visual assessment, ATMP-H was observed to start melting at 205°C, undergo phase transition (turned from solid to foam) at 210°C and then decompose at 215°C. The visual assessment was performed to assist with the interpretation of the thermographic profiles observed in the DSC.

In a supporting study (Vanesse 1992), ATMP-H was also observed to undergoes thermal decomposition with no loss of mass from around 225°C in a study that used the thermogravimetric analysis/differential scanning calorimetry method.

Melting temperature values of 210 to 215°C and 195 to 210°C with decomposition were reported for ATMP-H in available handbooks or collections of reliable data (Beilstein 1966 and 1973).

A melting point of -10°C was reported for ATMP-H in a secondary source to which no reliability could be assigned; this result likely refers to aqueous solution product.