Trisodium hydrogen ethylenediaminetetraacetate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

07 Feb - 27 Mar 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Type of method:

differential scanning calorimetry

Remarks:

followed by capillary method

Specific details on test material used for the study:

Storage conditions: room temperature

Atm. press.:

1 003 hPa

Decomposition:

yes

Decomp. temp.:

ca. 260 °C

Remarks on result:

other: no boiling point up to the decomposition temperature

Results
Residual moisture
The test item was dried until constant weight. 80.82 % moisture could be removed.

 

DSC Measurements
In the temperature range of 60 – 230 °C a first broad endothermic effect was observed, directly followed by a second endothermic effect in the temperature range of 230 – 300 °C. In the temperature range of 420 – 450 °C a small exothermic effect could be detected, with a decomposition energy of -20 J/g.

Table 1 – DSC measurement results

Sample weight [mg]	Onset of effect [°C]	Range of effect [°C]	Weight loss [mg]	Atmospheric pressure [hPa]
8.19	137.07 242.35 --	60 – 230 (endo) 230 – 300 (endo) 420 – 450 (exo)	4.08	1002.9
11.40	124.85 242.62 --	60 – 230 (endo) 230 – 300 (endo) 430 – 450 (exo)	5.89	1002.9

During the heating phase two endothermic effect were observed in the temperature ranges of 60 – 230 °C and 230 – 300 °C, which can’t be clearly assigned to the melting of the test item.

Thus an additional measurement by means of the capillary method was performed for a verification of the DSC results.

 

Capillary Method
The additional tests with the capillary method showed no change of the test item up to a temperature of 250 °C. At 250 °C the test item raised in the capillary and at approx. 260 °C the colour of the test item changed from white to brown. No melting or boiling of the test item could be observed up to its decomposition.

Combining the results of the DSC-measurements and the capillary method, the endothermic effects in the DSC can’t be assigned to the melting or boiling of the test item. They could be caused by evaporating gas.

The dried solid test item has no melting point and no boiling point up to the decomposition starting at approx. 260 °C.

 

Conclusion
The dried solid test item ETA Lösung 181 / TRISODIUM EDTA SOLUTION 20% has no boiling point up to the decomposition temperature of approx. 260 °C at atmospheric pressure (1003 hPa) as determined by differential scanning calorimetry and verified by means of the capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).

Description of key information

No boiling point at 1003 hPa (OECD Guideline 103, Differential Scanning Calorimetry)

Additional information

The test item has no boiling point up to the decomposition temperature of approx. 260 °C at atmospheric pressure (1003 hPa) as determined by differential scanning calorimetry and verified by means of the capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).