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EC number: 234-842-7 | CAS number: 12036-22-5
Overall means for TBO concentrations were determined gravimetrically to be 0.081, 0.331 and 0.652 mg/L for Groups 2 through 4, respectively. The TBO % recovery ranged from 100.83-102.38%.. Small amounts of TBO in the chemically-analyzed filters for the Filtered Air Control group were attributed to contamination during the filter analysis processing and/or the calibration curve. The Filtered Air Control group filter-collected mean gravimetric value was 0.000 mg/L. The particle size distribution of the test atmosphere was within the respirable range. The overall mean TBO inhaled dose levels were 14.8, 60.2 and 118.8 mg/kg/day for Groups 2 through 4, respectively. The overall mean male TBO inhaled dose levels were 13.7, 55.7 and 110.2 mg/kg/day for Groups 2 through 4, respectively. The overall mean female TBO inhaled dose levels were 15.8, 64.7 and 127.3 mg/kg/day for Groups 2 through 4, respectively. The male inhaled dose levels were 10-11% below the target levels for all groups, while the female inhaled dose levels were 3-5% above the target levels for all groups. Prior to exposure initiation, the homogeneity of the test atmosphere in each TBO exposure chamber was confirmed.
No repeated dose inhalation toxicity data of sufficient quality are available for tungsten dioxide (target substance). However, repeated dose inhalation toxicity data are available for tungsten oxide (source substance), which will be used for reading across. Due to lower water solubility and similar toxicity for the target substance compared to the source substance, the resulting read across from the source substance to the target substance is appropriate as a conservative estimate of potential toxicity for this endpoint. In addition, read across is appropriate because the classification and labelling is equally protective for the source and target substances, the PBT/vPvB profile is the same, and the dose descriptors are, or are expected to be, lower for the source substance. For more details, refer to the attached description of the read-across approach.
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