Reaction mass of copper digluconate, sodium sulphate and copper sulphate

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:

26.02.2019-01.03.2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

GLP compliance:

yes (incl. QA statement)

Type of method:

capillary method

Specific details on test material used for the study:

The sample was placed on a rotary evaporator at 40°C until no more water evaporated; the sample was spread onto trays and placed in an oven at 40°C for approximately 6 days with frequent agitation. The partially wet sample was removed from the trays and frozen. Whilst frozen the sample was ground to a fine powder then spread on trays and placed back into the oven at 40°C for 24 hours.

Key result

Decomposition:

yes

Decomp. temp.:

90 - 120 °C

Remarks on result:

not determinable

Remarks:

At 78°C the sample started shrinking and discolouring at 90°C. This continued up to 120°C.

Screening

Mass used (g) 0.002

Test Start Temperature (°C) 30

Test Final Temperature (°C) 350

Ramp Rate (°C/min) 6

Initial Melting Point (°C) 78

Final Melting Point (°C) -

Result: Decomposition 90 - 120°C

Conclusions:

Decomposition 90 - 120°C

Executive summary:

At 78°C the sample started shrinking and discolouring at 90°C. This continued up to 120°C. At 125°C the sample was not fully liquefied and started to generate gas and the sample was pushed up the tube. A colour change to brown was observed approximately at 134°C which can be attributed to decomposition. By 180°C only dark brown sample was visible in the capillary. As no melting point was observed no further testing was conducted.

Description of key information

No melting point was observed. Decomposition 90 -120 ºC