A review of available sources identified rat acute toxicity data (LD50, LC50). 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, a rat LC50, was selected as the TEEL-3 basis and scaled to a 60-minute equivalent using the ten Berge equation (Section 3.3.4). TEEL-2 and TEEL-1 values were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat LC50 (>5.09 mg/L/4H)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis is reported as an REL-TWA of 2 mg/m3 for soluble aluminum; however, the only source for soluble aluminum found during the current review was a PEL-TWA (2 mg/m3) that was vacated in 1989. The Rev. 29A TEEL-3 and TEEL-2 values were derived from this TEEL-1. The current TEEL-3 basis is a rat LC50; TEEL-2 and TEEL-1 values are derived from this TEEL-3.