A review of available sources identified no acute toxicity data or exposure limits for this compound. Reported GHS health hazard ratings (H314 and H318, Category 1; H315 and H319, Category 2; H335, inhalation Category 3) indicate a mid-level health hazard, approximately equivalent to an HHR=2. In addition, analysts considered the GHS health hazard ratings for a similar chemical, cerium (III) sulfate (CASRN: 13454-94-9), which report comparable codes (H315, H319, H335), also aligned with an HHR=2. As such, analysts assumed an HHR=2 as the TEEL-3 basis. 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 = HHR=2
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=2, from analysis of GHS health hazard statements, from which TEEL-2 and TEEL-1 were derived (Table 3.5).