PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Gadolinium nitrate, solid 10168-81-7
4.00
3.00
Formula Synonyms
GdN3O9
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
343.28 S 92
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
11 130 750
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.78 9.3 53
Technical Basis
A review of available sources identified rat acute toxicity data (LD50) for various routes (oral, intraperitoneal). Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. The most preferred route data, rat oral LD50, was selected as the TEEL-3 basis. TEEL-1 and TEEL-2 values 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 = Rat oral LD50 (3805 mg/kg)
This review generated PAC values consistent with Rev. 29A*.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Gadolinium-trinitrate.
Rat oral LD50: Environmental Quality and Safety, Supplement., 1(1), 1975 [PMID:1057514]. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Gadolinium-trinitrate.
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.