PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nitrilotriacetic acid, disodium salt; (Disodium nitrilotriacetate) | 15467-20-6 |
4.07
2.00
3.09
3.01
|
||||||||||
| Formula | Synonyms | |||||||||||
| C6.H7.N.O6.2Na | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 235.12 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 8.0 | 48 | 290 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.83 | 5.0 | 30 |
Technical Basis
A review of available sources identified rat oral LD50 toxicity data and exposure limits (OEL-TWAs, OEL-STELs, MAK-STEL) for nitrilotriacetic acid and its sodium salts (CASRN: varies). Data sources were selected according to the hierarchy listed in Table 3.1. The rat oral LD50 was selected as the TEEL-3 basis and evaluated using factors in Tables 3.2, 3.3, and 3.4. The TEEL-2 was derived according to Table 3.5. The MAK-STEL was selected as the TEEL-1.
• PAC-1 = TEEL-1 = MAK-STEL (8 mg/m3; nitrilotriacetic acids and its sodium salts; CASRN: varies)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (1460 mg/kg)
This review generated PAC-3 and PAC-2 values consistent with Rev. 29A, and an inconsistent PAC-1 value. The Rev. 29A and current TEEL-3 and TEEL-2 values, sources, and methodology remain consistent. The Rev. 29A TEEL-1 was derived from the TEEL-2 (Table 3.5), while the current TEEL-1 is an exposure limit, MAK-STEL.
• PAC-1 = TEEL-1 = MAK-STEL (8 mg/m3; nitrilotriacetic acids and its sodium salts; CASRN: varies)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (1460 mg/kg)
This review generated PAC-3 and PAC-2 values consistent with Rev. 29A, and an inconsistent PAC-1 value. The Rev. 29A and current TEEL-3 and TEEL-2 values, sources, and methodology remain consistent. The Rev. 29A TEEL-1 was derived from the TEEL-2 (Table 3.5), while the current TEEL-1 is an exposure limit, MAK-STEL.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Disodium-nitrilotriacetate.
MAK-STEL (nitrilotriacetic acid and its sodium salts, CASRN: varies): https://ilv.ifa.dguv.de/limitvalues/43894
Rat oral LD50: Toxicology and Applied Pharmacology., 18(398), 1971 [PMID:4998753]. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Disodium-nitrilotriacetate.