PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dimethyl mercury | 593-74-8 |
15.01
11.01
15.02
4.05
7.01
7.00
4.06
4.07
3.08
2.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| C2H6Hg | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 230.66 | L | 93 | 75 | 29 | 3.17 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0037 | 0.25 | 0.5 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.035 | 2.4 | 4.7 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for dimethyl mercury. Instead, exposure limits for mercury (organo) alkyl compounds (mercury alkyl, CASRN: 7439-97-6; ceiling limits, STELs, TWAs, ERPG-3/ERPG-2, and IDLH) were evaluated for TEEL development. Data sources were selected according to the hierarchy listed in Table 3.1. The mercury (organo) alkyl compounds ERPG-3 and ERPG-2 were selected as the TEEL-3 and TEEL-2, respectively. The mercury TLV-STEL was selected as the TEEL-1 basis and a compound adjustment factor was applied (Section 3.2.2).
• TEEL-1 = MW-adjusted TLV-STEL (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.03 mg/m3)
• TEEL-2 = ERPG-2 (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.25 ppm)
• TEEL-3 = ERPG-3 (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.5 ppm)
This review generated TEEL-3 and TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was the alkyl mercury 1994 IDLH (CASRN: 7439-97-6) and the Rev. 29A TEEL-2 basis was a mercury PEL-C; compound adjustment factors were applied to both limits. The current TEEL-3 and TEEL-2 are unadjusted ERPGs for mercury (organo) alkyl compounds (CASRN: 7439-97-6), a higher priority source (Section 1). The Rev. 29A and current TEEL-1 values, methodology, and source are consistent.
• TEEL-1 = MW-adjusted TLV-STEL (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.03 mg/m3)
• TEEL-2 = ERPG-2 (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.25 ppm)
• TEEL-3 = ERPG-3 (mercury (organo) alkyl compounds as Hg, CASRN: 7439-97-6, 0.5 ppm)
This review generated TEEL-3 and TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was the alkyl mercury 1994 IDLH (CASRN: 7439-97-6) and the Rev. 29A TEEL-2 basis was a mercury PEL-C; compound adjustment factors were applied to both limits. The current TEEL-3 and TEEL-2 are unadjusted ERPGs for mercury (organo) alkyl compounds (CASRN: 7439-97-6), a higher priority source (Section 1). The Rev. 29A and current TEEL-1 values, methodology, and source are consistent.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Dimethylmercury.
Mercury (organo) alkyl compounds, as Hg exposure limits: https://www.osha.gov/chemicaldata/503
Mercury (organo) alkyl compounds, as Hg IDLH: https://www.cdc.gov/niosh/idlh/merc-hg.html