PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sodium selenate; (Disodium selenate) | 13410-01-0 | 2630 |
11.01
4.08
4.05
4.01
7.01
7.00
11.00
4.09
4.10
4.07
|
|||||||||
| Formula | Synonyms | |||||||||||
| SeO4.2Na | SODIUM SELENATE, DISODIUM SELENATE, P-40, SEL-TEX SS02, SEL-TOX SS02 AND SS-20, SELENIC ACID (H2SEO4), DISODIUM SALT, SELENIC ACID(H2SEO4), DISODIUM SALT, SELENIC ACID, DISODIUM SALT, SODIUM SELENATE (NA2SEO4), SODIUM SELENIUM OXIDE, SODIUM SELENIUM OXIDE (NA2SEO4) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 188.94 | S/L | 3.098 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.15 | 1.6 | 2.3 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.019 | 0.21 | 0.30 |
Technical Basis
A review of available sources identified a LOC and acute toxicity data (LC50, LD50, LDLo, TDLo) for several routes and species. 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 4-hour rat LC50, was selected as the TEEL-3 basis and it was scaled to 60-minute equivalent using the ten Berge equation (Section 3.3.4). This LC50 dose is reported as a range (>0.051 ≤ 0.51 mg/mL/4H); analysts selected the lower range as the TEEL-3 basis, after considering the magnitude of other available toxicity data. The LOC was selected as the TEEL-2. The TEEL-1 value was derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = LOC (0.0016 gm/m3)
• PAC-3 = TEEL-3 = Rat LC50 (0.052 mg/L/4H)
This review generated PAC-3 and PAC-1 values inconsistent with Rev. 29A, and a PAC-2 consistent with Rev. 29A. The Rev. 29A TEEL-3 basis was a rat LDLo, while the current TEEL-3 basis is a rat LC50, a more preferred route (Section 3.3.2). The Rev. 29A TEEL-1 basis was a weight adjusted selenium TLV-TWA (CASRN: 7782-49-2), while the current TEEL-1 was derived from the TEEL-2 (Section 3.4.2). The Rev. 29A and current TEEL-2 value, source, and methodology are consistent.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = LOC (0.0016 gm/m3)
• PAC-3 = TEEL-3 = Rat LC50 (0.052 mg/L/4H)
This review generated PAC-3 and PAC-1 values inconsistent with Rev. 29A, and a PAC-2 consistent with Rev. 29A. The Rev. 29A TEEL-3 basis was a rat LDLo, while the current TEEL-3 basis is a rat LC50, a more preferred route (Section 3.3.2). The Rev. 29A TEEL-1 basis was a weight adjusted selenium TLV-TWA (CASRN: 7782-49-2), while the current TEEL-1 was derived from the TEEL-2 (Section 3.4.2). The Rev. 29A and current TEEL-2 value, source, and methodology are consistent.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/25960
Rat LC50 (> 0.052 and ≤ 0.51 mg/L). https://chem.echa.europa.eu/100.033.169/dossier-view/cf643ccd-8c1d-4bae-9655-8fad0ac1f10f/740b173d-6654-4b6d-936b-ca0f3b2d5cbf_be1bca9c-fe3c-46b5-9ff3-e5450751b70e?searchText=13410-01-0
LOC. Appendix C, pg. C-8. https://www.epa.gov/sites/default/files/2015-09/documents/technical_guidance_for_hazard_analysis.pdf
Selenium TLV-TWA: https://www.acgih.org/selenium-and-compounds/