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EC number: 237-529-3
CAS number: 13826-66-9
- Onset T = 88.16°C, heat of decomposition -384.45 J/g
- Onset T = 182.77°C, heat of decomposition -195.20 J/g
- Onset T = 223.69°C, heat of decomposition -15.67 J/g
- Onset T = 91.90°C, heat of decomposition -229.57 J/g
- Onset T = 198.13°C, heat of decomposition -110.14 J/g
- Onset T = 231.62°C, heat of decomposition -39.47 J/g
- Onset T = 111.03°C, heat of decomposition -287.48 J/g
- Onset T = 201.55°C, heat of decomposition -152.31 J/g
- Onset T = 234.62°C, heat of decomposition -70.95 J/g
- Onset T = 114.57°C, heat of decomposition -325.83 J/g
- Onset T = 201.29°C, heat of decomposition -146.26 J/g
- Onset T = 234.26°C, heat of decomposition -102.62 J/g
The endothermic events are believed to be related to successive
dehydrations (i.e. passage of hydrated form to another, thus to
successive loss of hydration water and to solubilisation of the test
item in this hydration water. In Test A and B, no test item remained in
the crucible at the end of the test, whereas in Test C and D, 5.3 and
6.6 mg of a white solid remained in the crucible, respectively, at the
end of the test. It is believed this difference between tests A-B and
C-D could be due to the fact the analyst selected finer particles for
Continuous weight loss was observed between
room temperature and 700°C which corresponds to 4 main thermal events:
1. An endothermic event with an onset at 78°C
and a maximum at 110°C corresponds mainly to material dehydration. The
LOD measurement carried out in the oven at 110°C/4h indicated a 15.5%
2. There are two further endotherms with
onsets at 191 and 231°C and maximums at 210 and 245°C, respectively,
which correspond to anionic species removal.
exotherm with an onset at 440°C and a maximum at 456°C corresponds to
Values of nitrogen and hydrogen after
elemental analysis were 7.32% and 2.03%
respectively. The calculated N:Zr
molar ratio in the final product was 1.2:1. The measured
LOI up to 1000°C was 57.5%. The final product was a white powder.
A weight of evidence approach was used including two available studies.
In both studies (Younis, 2015b, Klimisch 1, and Dvininov, 2017, Klimisch
2), no melting was observed. Instead, several endothermic events were
observed, which represent consecutive decomposition steps.
In a GLP study performed in accordance with EC test method A.1, the
melting point of zirconium dinitrate oxide was investigated applying
Differential Scanning Calorimetry (Younis, 2015b). It was concluded that
the test item does not melt. The endothermic peaks observed on DSC
curves correspond to successive dehydrations (i.e. passage of an
hydrated form to another) of the test item upon heating, thus to the
loss of hydration water and the solubilisation of the test item in this
water. The first endothermic event started between 88.16 and 114.57°C,
depending on the experiment, whereas the other events started between
182.77 and 201.55°C and between 223.69 and 234.62°C, respectively,
depending on the experiment. This study was considered as reliable
In another study, the melting point of dried zirconium dinitrate oxide
was investigated using TG/DTA (Dvininov, 2017). In this study,
consecutive endothermic events were also observed. The first event, with
an onset at 78°C and a maximum at 110°C, represented further dehydration
of the dried test substance. The second and third event, with an onset
at 191 and 231°C, and maxima at 210 and 245°C, respectively, represented
anionic species removal. Finally, an exothermic event with an onset at
440°C and a maximum at 456°C, represented material crystallisation. From
the results of this study it was concluded that the test material is
subject to decomposition and does not present melting behaviour. This
study was considered reliable with restrictions (Klimisch 2).
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