ORGANOPHOSPHORUS PESTICIDES: METHOD 5600, Issue 1, dated 15 August 1994 - Page 8 of 20 Table 2.
Toxicity and Maximum Exposure Limits
Compound STEL (alphabetically)
1. Azinphos methyl 2. Chlorpyrifos 0.6 (5) 3. Diazinon 4. Dicrotophos 5. Disulfoton 6. Ethion 7. Ethoprop 8. Fenamiphos 9. Fonofos 10. Malathion 11. Methamidophos 12. Methyl parathion 13. Mevinphos 0.27 (6) 14. Monocrotophos (skin) 15. Parathion 16. Phorate 0.2 (5,6) 17. Ronnel 18. Sulprofos 19. Terbufos (1) (2) (3) (4) (5) (6)
LD50, mg/Kg(1)
OSHA PEL(4) mg/m3
NIOSH REL(5) mg/m3 (ppm)
ACGIH TLV 3 3 mg/mmg/m
11 f 145
0.2 0.2
0.2 0.2
(0.015) (0.014)
0.2 (skin) 0.2 (skin)
250 m, 285 f 16 f, 21 m 2.3 f, 6.8 m 27 f, 65 m 61.5 (2) 10 3 f, 13 m (3) 1000 f, 1375 m 25 m, 27 f 14 m, 24 f 3.7 f, 6.1 m
0.1 0.25 0.1 0.4
0.1 0.25 0.1 0.4
(0.008) (0.026) (0.009) (0.025)
0.1 (skin) 0.25 (skin) 0.1(3) (skin) 0.4 (skin)
0.1 0.1 10
(0.008) (0.010) (0.740)
0.1 (skin) 0.1 (skin) 10 (skin)
0.2 0.1
0.2 0.1
(0.019) (0.011)
0.2 (skin) 0.1 (skin)
17 m, 20 f
0.25
0.25
(0.027)
0.25 (3)
3.6 f, 13 m 1.1 f, 2.3 m
0.1 0.05
0.05 0.05
(0.004) (0.005)
0.1 (skin) 0.05 (skin)
1250 m, 2630 f 227 1.6-4.5 m, 9.0 f
0.1 0.1 10
10 1
10 1
(0.760) (0.076)
Rat-oral; from Merck Index, unless otherwise noted, f = female, m = male [2]. Farm Chemicals Handbook [3]. RTECS [1]. OSHA Final Rule, 1989 (unenforceable, 1992); only Malathion and Parathion had previous PELs. NIOSH Recommendations for Occupational Safety and Health [5]. ACGIH [18].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
10 (skin) 1(3) (skin)
