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Chemical Name: 3-Methyl-2-benzothiazolinone hydrazone
Chemical Formula: C8H9N3S
Appearance: Light yellow to pale beige solid, powder or crystalline
Typical Applications: Reagent for colorimetric determination of phenols, amines, and other compounds in laboratory analysis, especially water testing and food chemistry
Odor: Odorless or faintly musty
Synonyms: MBTH, 2-Benzothiazolylhydrazone, 3-Methyl-
Classification: May carry harmful effects upon inhalation, ingestion, or skin absorption as some similar hydrazones.
Potential Health Hazards: Irritant to eyes, skin, and respiratory tract. Chronic or repeated exposure may carry a risk of organ damage, particularly to liver or kidneys. Some hydrazone compounds have shown mutagenic or carcinogenic potential in animal studies; MBTH’s risk to humans is not fully characterized.
Symbols: Not classified as highly hazardous in small laboratory use but caution recommended; check any local hazard pictograms.
Routes of Exposure: Skin and eye contact, inhalation of dust, ingestion.
Precautionary Statements: Use in a ventilated area, avoid creating dust, always wear proper protection.
Main Ingredient: 3-Methyl-2-benzothiazolinone hydrazone (CAS: 1491-29-8)
Common Purity: Laboratory grade is typically 98% or higher.
Impurities: Seldom specified for lab use but may include trace benzothiazoles or hydrazine derivatives.
Eye Contact: Rinse immediately with plenty of water for at least 15 minutes, keeping eyelids apart, get medical attention if irritation develops.
Skin Contact: Thoroughly wash exposed skin with soap and water, strip contaminated clothing, seek attention for persistent irritation.
Ingestion: Rinse mouth, do not induce vomiting, seek medical advice without delay.
Inhalation: Remove to fresh air, monitor breathing, seek medical help if discomfort persists.
Important Note: Never give anything by mouth to an unconscious person.
Flammability: Generally considered non-flammable solid, but decomposition may release toxic fumes such as nitrogen oxides and sulfur oxides if heated strongly.
Suitable Extinguishing Media: Use water spray, CO2, dry chemical, or foam for surrounding fire.
Fire/Explosion Hazards: Dust may form explosive mixture in air if present at high concentrations.
Protective Equipment: Wear self-contained breathing apparatus and full protective gear.
Special Actions: Cool containers with water spray, avoid inhaling combustion products.
Spill Cleanup Methods: Avoid raising dust, ventilate area, sweep up using tools that minimize dust, place in sealed container for disposal.
Containment: Prevent material from sweeping into drains or natural waters.
Personal Precautions: Wear gloves, lab coat, and eye protection; consider respiratory protection for large spills.
Decontamination: Wash equipment and area thoroughly after cleanup.
Safe Handling: Avoid breathing dust, keep containers tightly closed when not in use, practice good hygiene after use.
Storage Conditions: Store in cool, dry, and well-ventilated space, away from direct sunlight and incompatible materials such as strong oxidizers or acids.
Segregation: Do not store next to food or feed.
Container Materials: Use glass or high-density polyethylene; keep lid tightly sealed.
Engineering Controls: Work in fume hood or well-ventilated area to minimize dust and inhalation.
Personal Protective Equipment: Use chemically resistant gloves (nitrile or latex), safety goggles or face shield, and lab coat.
Respiratory Protection: Appropriate dust mask or respirator if substantial dust generation is possible.
Environmental Controls: Do not allow waste to discharge into environment.
Physical State: Solid, powder or fine crystals
Color: Pale yellow, beige, sometimes off-white
Melting Point: Around 187-193°C for pure compound
Solubility: Soluble in water and most polar organic solvents; hydrochloride form dissolves more readily
Molecular Weight: About 179.24 g/mol for base compound
Odor: Nearly odorless
Stability: Stable under recommended storage at room temperature
Stability: Stable in closed containers at ambient conditions; avoid excess heat and moisture.
Incompatible Materials: Strong acids, strong oxidizing agents, some metals.
Hazardous Decomposition Products: May produce sulfur oxides, nitrogen oxides, and carbon monoxide in fire or high-temperature decompositions.
Polymerization: Does not polymerize.
Routes of Exposure: Can enter body through inhalation, skin contact, or accidental ingestion.
Acute Effects: Causes irritation to eyes, skin, and respiratory tract. Ingestion may upset the digestive system and could harm the liver or kidneys.
Chronic Effects: Information is limited, but some compounds in this chemical group show mutagenic or carcinogenic properties in research animals. No conclusive evidence for MBTH in humans.
Sensitization: May provoke allergic reaction on prolonged contact.
Other Health Effects: Hydrazone derivatives sometimes suppress blood cell counts with chronic exposure.
Aquatic Effects: Data on exact aquatic toxicity limited, but recommended to avoid discharge into waterways. Some breakdown products can be harmful to aquatic organisms.
Persistence: Not readily biodegradable; may persist in environment.
Bioaccumulation: Low potential predicted due to solubility and molecular size.
Waste Disposal: Dispose as hazardous chemical waste through an authorized disposal service in accordance with local regulations.
Container Treatment: Rinse empty containers thoroughly, dispose of as chemical waste.
Avoid: Pouring down drains, burning, or releasing into environment.
UN Classification: Not regulated in small laboratory containers, but local rules may apply.
Packaging Instructions: Use sturdy, chemically resistant containers with tight closure.
Shipping Precautions: Label containers clearly, avoid contact with incompatible substances during transit.
Workplace Controls: Subject to workplace safety regulations on handling hazardous chemicals.
GHS Classification: Typically not classified as highly hazardous, but handle with standard laboratory precautions.
Environmental Regulations: Restrictions exist for discharging chemical wastes to the environment; consult local pollution control guidelines.
Labelling: Use standard chemical safety and hazard labelling.
