A review of available sources did not identify exposure limits or acute toxicity data for neodymium nitrate pentahydrate. Instead, analysts evaluated available toxicity data for neodymium nitrate (Nd(NO3)3, CASRN: 10045-95-1) for TEEL development. 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 species and route toxicity data, a rat oral LD50 was selected as the TEEL-3 basis and weight adjusted from anhydrous neodymium nitrate (Section 3.4.3). TEEL-2 and TEEL-1 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 = MW-adjusted rat oral LD50 (neodymium nitrate, CASRN: 10045-95-1, 2072 mg/kg)
This review generated a PAC values inconsistent with Rev. 29A. The Rev. 29A TEELs were weight adjusted TEELs for neodymium nitrate (CASRN: 10045-95-1). Instead, the current TEEL-3 basis is a weight adjusted rat oral LD50 for neodymium nitrate (CASRN: 10045-95-1), from which the TEEL-2 and TEEL-1 values were derived (Table 3.5).