Chemical Safety Program: PACs for Chemicals of Concern

PAC Database - Detailed Chemical Data

Chemical Identity

Chemical	CAS#	Health Code Numbers
Methylmercuric dicyanamide	502-39-6	14.02 7.00 7.01 11.00 7.11 3.05 3.06 3.02 7.10 5.00
Formula	Synonyms
C3H6HgN4	METHYLMERCURIC DICYANAMIDE, (CYANOGUANIDINO)METHYLMERCURY, AGROSOL, CYANO(METHYLMERCURI) GUANIDINE, CYANO(METHYLMERCURI)GUANIDINE, GUANIDINE, CYANO(METHYLMERCURIO)-, GUANIDINE, CYANO-, MERCURY COMPLEX, GUANIDINE, CYANO-, METHYLMERCURY DERIV, MEMA, MERCURY, (CYANOGUANIDINATO)METHYL-, MERCURY, (CYANOGUANIDINATO-N^)METHYL-, MERCURY, (CYANOGUANIDINE)METHYL-, MERCURY,(3-CYANOGUANIDINO)METHYL-, MERCURY,(CYANOGUANIDINATO)METHYL-, MERCURY,(CYANOGUANIDINATO-N')METHYL-, METHYL MERCURIC DICYANDIAMIDE, METHYLMERCURIC CYANOGUANIDINE, METHYLMERCURIC DICYANDIAMIDE, METHYLMERCURY DICYANDIAMIDE, MMD, MORSODREN, MORTON EP-227, MORTON SOIL DRENCH, MORTON SOIL-DRENCH-C, N-CYANO-N'-(METHYL-MERCURY)GUANIDINE, N-CYANO-N'-(METHYLMERCURY)GUANIDINE, PANDRINOX, PANO-DRENCH, PANO-DRENCH 4, PANODRIN A-13, PANOGEN, PANOGEN (OLD), PANOGEN 15, PANOGEN 43, PANOGEN 8, PANOGEN PX, PANOGEN TURF FUNGICIDE, PANOGEN TURF SPRAY, PANOGEN(OLD), PANOSPRAY 30, R 8, R 8 (FUNGICIDE), R 8(FUNGICIDE), ZAPRAWA NASIENNA PLYNNA

Physical Properties

Mol Wt	State	MP (°C)	BP (°C)	VP (Hg)	VP (°C)	SG	LEL (ppm)
298.72	S	156		0.00003	25

PAC Values

PAC Values (Original Units: ppm)
PAC-1	PAC-2	PAC-3
0.0037	0.25	0.50

Converted PAC Values (mg/m3)
PAC-1	PAC-2	PAC-3
0.045	3.1	6.1

Technical Basis

A review of available sources identified mouse and rat acute toxicity data (LD50) for several routes. In addition, there are exposure limits for mercury (organo) alkyl compounds (mercury alkyl, CASRN: 7439-97-6; ceiling limits, STELs, TWAs, ERPG-3/ERPG-2, and IDLH). 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 mercury (organo) alkyl compounds ERPG-3 and ERPG-2 were selected as the TEEL-3 and TEEL-2, respectively. Note that the methylmercuric dicanamide toxicity doses evaluated resulted in TEEL values comparable in magnitude to these exposure limits. 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.

References

Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Morsodren.

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

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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.