A review of available sources did not identify exposure limits or acute toxicity data for ammonium tartrate. Analysts evaluated DL-tartaric acid (CASRN: 526-83-0) and disodium tartrate (CASRN: 868-18-8) for TEEL development. Data sources were selected according to the hierarchy listed in Table 3.1. Reported GHS health hazard ratings for DL-tartaric acid (H315 and H319, Category 2; H335, Category 3) and disodium tartrate (H302, Category 4) indicate a mid-level health hazard, approximately equivalent to an HHR=2. Considering this, analysts were conservative and assumed an HHR=2 as the TEEL-3 basis (Section 3.4.5). 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 that was developed from analysis of GHS health hazard statements for a similar compound, DL-Tartaric acid (CASRN: 526-83-0), from which TEEL-2 and TEEL-1 were derived (Table 3.5).