PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gadolinium hydroxide | 16469-18-4 |
4.00
3.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| Gd.(O.H)3 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 208.27 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 12 | 130 | 790 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.4 | 15 | 93 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for gadolinium hydroxide. Analysts instead evaluated available GHS health hazard data for gadolinium oxide (CASRN: 11129-31-0) and gadolinium(III) carbonate hydrate (CASRN: 38245-36-2), which range between Category 2-4, indicating a mid-level hazard approximately equal to an HHR=2. Considering this, analysts assumed an HHR=2. TEEL-2 and TEEL-1 value were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=2
This review generated PAC values consistent with Rev. 29A*.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=2
This review generated PAC values consistent with Rev. 29A*.
References
Chemical information: https://comptox.epa.gov/dashboard/chemical/details/DTXSID80936979
Gadolinium oxide (CASRN: 11129-31-0) information: https://pubchem.ncbi.nlm.nih.gov/compound/159427
Gadolinium carbonate hydrate (CASRN: 38245-36-2) information: https://pubchem.ncbi.nlm.nih.gov/compound/16212943