Ethanolamine

CAS number: 141–43–5

NIOSH REL: 3 ppm (8 mg/m³) TWA, 6 ppm (15 mg/m³) STEL

Current OSHA PEL: 3 ppm (6 mg/m³) TWA

1989 OSHA PEL: 3 ppm (8 mg/m³) TWA, 6 ppm (15 mg/m³) STEL

1993-1994 ACGIH TLV: 3 ppm (7.5 mg/m³) TWA, 6 ppm (15 mg/m³) STEL

Description of Substance: Colorless, viscous liquid or solid (below 51 F) with an unpleasant, ammonia-like odor.

LEL(@284 F): 3.0% (10% LEL(@284 F), 3,000 ppm)

Original (SCP) IDLH: 1,000 ppm

Basis for original (SCP) IDLH: The chosen IDLH is based on the statement by AIHA [1968] that the saturated concentration (less than 1,316 ppm) at room temperature should not be immediately hazardous to life. However, AIHA [1968] also reported that sprays and mists evolving from these compounds at elevated temperatures may be dangerous.

Existing short-term exposure guidelines: National Research Council [NRC 1984] Emergency Exposure Guidance Levels (EEGLs):

1-hour EEGL: 50 ppm

24-hour EEGL: 3 ppm

ACUTE TOXICITY DATA

Lethal concentration data:

Species	Reference	LC50 (ppm)	LCLo (ppm)	Time	Adjusted 0.5-hr LC (CF)	Derived value
G. pig	Treon et al. 1957	LC67: 233	-----	1 hr	291 ppm (1.25)	29 ppm

Lethal dose data:

Species	Reference	Route	LD50 (mg/kg)	LDLo (mg/kg)	Adjusted LD	Derived value
Rat G. pig Rat Mouse Rabbit Rabbit Mouse Rat	Hartung and Cornish 1968 Sidorov et al. 1968 Sidorov et al. 1968 Sidorov et al. 1968 Sidorov et al. 1968 Sidorov and Timofievskaya 1979 Timofievskaya 1962 Vernot et al. 1977	oral oral oral oral oral oral oral oral	3,320 620 2,050 1,475 1,000 1,000 700 1,720-1,970	----- ----- ----- ----- ----- ----- ----- -----	9,150 ppm 1,709 ppm 5,650 ppm 4,065 ppm 2,776 ppm 2,756 ppm 1,920 ppm 4,740-5,429 ppm	915 ppm 171 ppm 565 ppm 407 ppm 278 ppm 276 ppm 192 ppm 474-543 ppm

Other animal data: Cats exposed for 2 hours to vapors of ethanolamine at concentrations reaching 970 ppm displayed vomiting tendencies; mice had no adverse effects from the same exposures [Sidorov et al. 1968]. A single 8-hour exposure to "concentrated vapors" did not kill any of six rats [UCC 1970]. Guinea pigs survived a 15-minute exposure to ethanolamine at 193 ppm [Treon et al. 1957].

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

Revised IDLH: 30 ppm Basis for revised IDLH: The revised IDLH for ethanolamine is 30 ppm based on acute inhalation toxicity data in animals [Treon et al. 1957].

REFERENCES:

1. AIHA [1968]. Ethanolamines. In: Hygienic guide series. Am Ind Hyg Assoc J 29:312-315.

2. Hartung R, Cornish HH [1968]. Cholinesterase inhibition in the acute toxicity of alkyl-substituted 2-aminoethanol. Toxicol Appl Pharmacol 12:486-494.

3. NRC [1984]. Emergency and continuous exposure limits for selected airborne contaminants. Vol. 2. Washington, DC: National Academy Press, Committee on Toxicology, Board on Toxicology and Environmental Health Hazards, Commission on Life Sciences, National Research Council, pp. 17-25.

4. Sidorov KK, Gorban GM, Tikhonova GP [1968]. Comparative toxicological characteristics of some regenerable absorbers of carbon dioxide. Kosm Biol Aviak Med 2:289-292 (in Russian).

5. Sidorov KK, Timofievskaya LA [1979]. Data for use in setting the MAC for monoethanolamine in the working environment. Gig Tr Prof Zabol 23(9):55 (in Russian).

6. Timofievskaya LA [1962]. Toxicological characteristics of monoethanolamine. Toksikol Nov Prom Khim Vesh 4:81-91 (in Russian).

7. Treon JF, Cleveland FP, Stemmer KL, Cappel J, Larson EE, Shaffer F [1957]. Toxicity of monoethanolamine in air. Cincinnati, OH: Kettering Laboratory.

8. UCC [1970]. Ethanolamines. New York, NY: Union Carbide Corporation, Chemicals and Plastics, p. 30.

9. Vernot EH, MacEwen JD, Haun CC, Kinkead ER [1977]. Acute toxicity and skin corrosion data for some organic and inorganic compounds and aqueous solutions. Toxicol Appl Pharmacol 42:417-423.