PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Erbium nitrate pentahydrate | 10031-51-3 |
15.01
11.01
15.02
|
||||||||||
| Formula | Synonyms | |||||||||||
| Er.(N.O3)3.5(H2.O) | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 443.35 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.077 | 0.83 | 4.9 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.4 | 15 | 89 |
Technical Basis
Analysts used toxicity data for erbium(III) nitrate, applying Table 3.4:
Exposure and toxicity values were not available for erbium(III) nitrate pentahydrate. The compound adjustment factor (CAF) for this agent, excluding the hydrates, was used, resulting in a TEEL-3 of 88 mg/m3.
Other calculational avenues were explored, such as the CAF of nitric acid and HHRs for erbium nitrate pentahydrate, both resulting in less conservative values.
TEEL-1 = TEEL-2/11
TEEL-2 = TEEL-3/6
TEEL-3: LD50, Rat, ip, (MW adjusted dose from 177 mg/kg of erbium(III) nitrate)
Both analysts converged with the values presented in Rev 29A and did not result in a change.
TEELs were rounded to two significant figures and converted from referenced units to either ppm or mg/m3, providing both values.
Exposure and toxicity values were not available for erbium(III) nitrate pentahydrate. The compound adjustment factor (CAF) for this agent, excluding the hydrates, was used, resulting in a TEEL-3 of 88 mg/m3.
Other calculational avenues were explored, such as the CAF of nitric acid and HHRs for erbium nitrate pentahydrate, both resulting in less conservative values.
TEEL-1 = TEEL-2/11
TEEL-2 = TEEL-3/6
TEEL-3: LD50, Rat, ip, (MW adjusted dose from 177 mg/kg of erbium(III) nitrate)
Both analysts converged with the values presented in Rev 29A and did not result in a change.
TEELs were rounded to two significant figures and converted from referenced units to either ppm or mg/m3, providing both values.
References
Temporary Emergency Exposure Limits for Chemicals: Methods and Practice (DOE-HDBK-1046-2016)
https://pubchem.ncbi.nlm.nih.gov/compound/159265#section=Adverse-Effects
https://chem.nlm.nih.gov/chemidplus/rn/10168-80-6