Product Identification

Product Name

Phenyl-1,2,4-triazolyl-3-(O,O-diethyl thionophosphate)

Synonyms

Diethoxy-[(1-phenyl-1,2,4-triazol-3-yl)oxy]-sulfanylidenephosphorane
Hostathion
O,O-Diethyl O-(1-phenyl-1H-1,2,4-triazol-3-yl) phosphorothioate
Triazophos

CAS

24017-47-8

Formula

C12H16N3O3PS

Molecular Weight

313.32

EINECS

245-986-5

RTECS

TF5635000

RTECS Class

Agricultural Chemical and Pesticide

Merck

12,9736

Beilstein/Gmelin

682554

EC Index Number

015-140-00-8

EC Class

Toxic; Harmful; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Yellowish oil.

Solubility in water

39 mg/L (23 C)

Melting Point

0 - 8

Boiling Point

418

Vapor Pressure

4E-7 (25 C)

Density

1.247 g/cm3 (20 C)

pKa/pKb

9.15 (pKb)

Partition Coefficient

3.55

Heat Of Vaporization

67.1 kJ/mol

Usage

It is a broad spectrum insecticide and acaricide with some nematicidal properties. It controls aphids on cereals and fruit.

First Aid Measures

Ingestion

Seek medical assistance.

Inhalation

Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.

Skin

Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.

Eyes

Immediately flush with running water for at least 20 minutes.

Handling and Storage

Storage

Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Inhalation

Dyspnea, rales, bronchorrhea, bronchospasm, or tachypnea may be noted. Noncardiogenic pulmonary edema may occur in severe cases. Chemical pneumonitis may be seen.

Skin

Sweating is a consistent but not universal sign.

Eyes

Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur in severe poisonings. Opsoclonus has been reported in one case. Salivation commonly occurs.

Ingestion

Vomiting, hypersalivation, diarrhea, fecal incontinence and abdominal pain may occur.

Hazards

This is an organophosphate pesticide. Some of these materials may burn but none of them ignite readily. Container may explode in heat of fire. Degraded by acids and alkalis.

UN (DOT)

3018

Exposure Controls/Personal Protection

Personal Protection

Workers. Must be given personal protective equipment comprising overalls made of a tight fabric or polyvinyl chloride, gloves and rubber boots. The eyes should be protected by goggles.

Respirators

Must wear a respirator with an activated-carbon gas filter cartridge affording protection for a determined number of hours.

Exposure Effects

Fever, low heart rate and abnormally low blood pressure, or rapid heart rate and elevated blood pressure may occur. Headache, dizziness, muscle spasms and profound weakness are common. Alterations of level of consciousness, anxiety, paralysis, seizures and coma may occur. Seizures may be more common in children.

Poison Class

3

Fire Fighting Measures

Flash Point

135

Fire Fighting

This is an organophosphate pesticide. Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and special protective clothing. Remove and isolate contaminated clothing at the site. Move container from fire area if you can do it without risk. Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material.Extinguish with dry chemical, carbon dioxide, water spray, fog, or foam.

Fire Potential

Combustible material: may burn but does not ignite readily.

Accidental Release Measures

Small spills/leaks

Avoid inhalation and skin contact. This is an organophosphate pesticide. Do not touch spilled material; stop leak if you can do so without risk. Use water spray to reduce vapors. Small spills: absorb with sand or other noncombustible absorbent material and place into containers for later disposal. Small dry spills: with clean shovel, place material into clean, dry container and cover; move containers from spill area. Large spills: dike far ahead of spill for later disposal.

Stability and Reactivity

Stability

Stable to sunlight.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

3018

Hazard Class

6.1

Packing Group

I; II; III