Immediately Dangerous to Life or Health Concentrations (IDLH)
CAS number: 100–74–3
NIOSH REL: 5 ppm (23 mg/m3) TWA [skin]
Current OSHA PEL: 20 ppm (94 mg/m3) TWA [skin]
1989 OSHA PEL: 5 ppm (23 mg/m3) TWA [skin]
1993-1994 ACGIH TLV: 5 ppm (24 mg/m3) TWA [skin]
Description of Substance: Colorless liquid with an ammonia-like odor.
LEL:. . Unknown
Original (SCP) IDLH: 2,000 ppm
Basis for original (SCP) IDLH: The chosen IDLH is based on the statement that 1 of 6 rats died following a 4-hour exposure to 2,000 ppm [Smyth et al. 1954 cited by ACGIH 1971].
Short-term exposure guidelines: None developed
ACUTE TOXICITY DATA
Lethal concentration data:
|Adjusted 0.5-hr |
|Rat||Smyth et al. 1954||LC17: 2,000||-----||4 hr||4,000 ppm (2.0)||400 ppm|
Lethal dose data:
|Smyth et al. 1954 |
|2,601 ppm |
|260 ppm |
Human data: Exposures to 100 ppm for 2.5 minutes have resulted in olfactory fatigue and irritation of the eyes, nose, and throat; irritation was slight after 25 minutes at 50 ppm and absent at 25 ppm [Smyth 1964]. Corneal edema has been noted in workers exposed to concentrations greater than 40 ppm for several hours [Dernehl 1966]. In another study, workers exposed to concentrations as high as 11 ppm but averaging about 3 to 4 ppm complained of drowsiness, optical halos, and foggy vision [Woewicki 1968].
|Revised IDLH: 100 ppm |
Basis for revised IDLH: The revised IDLH for N-ethylmorpholine is 100 ppm based on acute inhalation toxicity data in humans [Dernehl 1966; Smyth 1964]. This may be a conservative value due to the lack of relevant acute toxicity data for workers exposed to concentrations above 100 ppm.
1. ACGIH . N-Ethylmorpholine. In: Documentation of the threshold limit values for substances in workroom air. 3rd ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 113.
2. Dernehl CU . Health hazards associated with polyurethane foams. J Occup Med 8:59-62.
3. Smyth JF Jr . Personal communication to ACGIH TLV Committee (November 24, 1964). [From ACGIH . N-Ethyl morpholine. In: Documentation of the threshold limit values and biological exposure indices. 6th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, pp. 638-639.]
4. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC . Range-finding toxicity data: list V. AMA Arch Ind Hyg Occup Med 10:61-68.
5. Timofievskaya LA . Comparative evaluation of the toxicity of piperazine and N-methyl piperazine. Toksikol Nov Prom Khim Vesh 15:116-123 (in Russian).
6. Woewicki A . Personal communication to ACGIH TLV Committee. [From ACGIH . N-Ethyl morpholine. In: Documentation of the threshold limit values and biological exposure indices. 6th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, pp. 638-639.]
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