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Brazil - Final Regulatory Action
Methyl parathion CAS number:
Date circular:

Chemical name: O,O-Dimethyl O-4-nitrophenyl phosphorothioate

Final regulatory action has been taken for the category: Pesticide

Final regulatory action: The chemical is Severely Restricted

Use or uses prohibited by the final regulatory action:


Pesticide use or uses that remain allowed:

Insecticide/acaricide for culture of cotton, onion, rice, potatoes, garlic, bean, soy bean, corn and wheat.

The final regulatory action was based on a risk or hazard evaluation: Yes

Summary of the final regulatory action:

Law No. 7.802 of 11 July 1989 and Decree No. 4.074 of 4 January 2002 - Pesticides and its compounds need to be registered by the Federal Authority prior to produce, export, import, trade or use.

The reasons for the final regulatory action were relevant to: Human health and environment

Summary of known hazards and risks to human health:

Methyl parathion is a highly toxic insecticide in EPA toxicity class I. Some or all formulations of methyl parathion may be classified as Restricted Use Pesticides (RUPs). RUPs may be purchased and used only by certified applicators. Labels for products containing methyl parathion must bear the Signal Word DANGER.

Expected effect of the final regulatory action in relation to human health:

Total control for the uses specially authorized;
Better environment quality and health due the safety use and of this chemical.

Summary of known hazards and risks to the environment:

Methyl parathion is very toxic to birds. Reported acute oral LD50 values are 3 mg/kg in American kestrels, 7.5 mg/kg in European starlings, 6 to 10 mg/kg in mallards, 8 mg/kg in northern bobwhites, 10 to 24 mg/kg in red-wing blackbirds, and 8 mg/kg in ring-neck pheasants. The 5- to 8-day dietary LC50 values reported for methyl parathion include 69 ppm in Japanese quail, 330 to 680 ppm in mallard, 90 ppm in northern bobwhite, and 91 ppm in ring-neck pheasant. Methyl parathion is moderately toxic to fish and to animals that eat fish. Reported 96-hour LC50 values are from 1.9 to 8.9 mg/L in the following fish species: coho salmon, cutthroat trout, rainbow trout, brown trout, lake trout, goldfish, carp, fathead minnow, black bullhead, channel catfish, green sunfish, bluegill, largemouth bass, and yellow perch. Reported 96-hour LC50 values indicate very high toxicity for aquatic invertebrates such as Daphnia spp., scuds, and sideswimmers. Methyl parathion is toxic to bees.

Expected effect of the final regulatory action in relation to the environment:

Use controlled of this chemical by Federal Body of Environment, Health and Agriculture.

Date of entry into force of the final regulatory action: 04/01/2002