Crag® herbicide

IDLH Documentation

CAS number: 136­78­7

NIOSH REL: 10 mg/m3 (total dust) TWA, 5 mg/m3 (respirable dust) TWA

Current OSHA PEL: 15 mg/m3 (total dust) TWA, 5 mg/m3 (respirable dust) TWA

1989 OSHA PEL: 10 mg/m3 (total dust) TWA, 5 mg/m3 (respirable dust) TWA

1993­1994 ACGIH TLV: 10 mg/m3 TWA

Description of Substance: Colorless to white crystalline, odorless solid.

LEL: . . Noncombustible Solid

Original (SCP) IDLH: 5,000 mg/m3

Basis for original (SCP) IDLH: According to many sources, Crag® herbicide is not very toxic to mammals. Because no acute inhalation toxicity data are available, the chosen IDLH has been estimated from the rat oral LD50 of 730 mg/kg [Gunther 1962 cited by NIOSH 1976].

Short­term exposure guidelines: None developed

ACUTE TOXICITY DATA

Lethal dose data:


Species

Reference

Route
LD50

(mg/kg)
LDLo

(mg/kg)

Adjusted LD
Derived value
Rat

Rat

Mammal
Carpenter et al. 1961

Gunther 1962

Sine 1991
oral

oral

oral
480

730

1,230
-----

-----

-----
3,360 mg/m3

5,110 mg/m3

8,610 mg/m3
336 mg/m3

511 mg/m3

861 mg/m3


Human data: None relevant for use in determining the revised IDLH.

Revised IDLH: 500 mg/m3

Basis for revised IDLH: No inhalation toxicity data are available on which to base an IDLH for Crag® herbicide. Therefore, the revised IDLH for Crag® herbicide is 500 mg/m3 based on acute oral toxicity data in animals [Carpenter et al. 1961; Gunther 1962; Sine 1991]. This may be a conservative value due to the lack of acute toxicity data for workers.


REFERENCES:

1. Carpenter CP, Weil CS, Smyth HF Jr. [1961]. Mammalian toxicity of sesone herbicide. J Agri Food Chem 9:382­385

2. Gunther FA, ed. [1962]. Residues of pesticides and other foreign chemicals in food and feeds. Vol. I. Secaucus, NJ: Springer Verlag New York, Inc., p. 18.

3. NIOSH [1976]. KK49000. Ethanol, 2­(2,4­dichlorophenoxy)­, hydrogen sulfate, sodium salt. In: Registry of toxic effects of chemical substances, 1976 ed. Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Center for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 76­191, p. 503.

4. Sine C, ed. [1991]. Sesone. In: Farm chemicals handbook '91, p. C273.
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