Podcast
Questions and Answers
What should be done before attempting to stop a leak between a cylinder and regulator?
What should be done before attempting to stop a leak between a cylinder and regulator?
- Remove the cylinder from the regulator
- Close the valve first (correct)
- Turn off all electrical equipment
- Tighten the union nut immediately
What is the primary risk associated with inhalation of toxic chemicals in the laboratory?
What is the primary risk associated with inhalation of toxic chemicals in the laboratory?
- Contamination of food and drink
- Long-term damage from skin contact
- Immediate effects on the body (correct)
- Accidental ingestion through mouth suction
Why is ingestion of chemicals in laboratories less common?
Why is ingestion of chemicals in laboratories less common?
- It occurs primarily through contaminated food or drink (correct)
- Chemicals only enter through skin contact
- All chemicals are always contained in bottles
- Lab personnel are fully trained to avoid this
What should be done with a leaking or damaged cylinder?
What should be done with a leaking or damaged cylinder?
What is a significant risk when smoking near volatile compounds?
What is a significant risk when smoking near volatile compounds?
Which route of absorption for chemicals is characterized by immediate effects on the body?
Which route of absorption for chemicals is characterized by immediate effects on the body?
Which of the following statements is true about chemical absorption through the skin?
Which of the following statements is true about chemical absorption through the skin?
How does the accidental contamination of food and drink commonly occur in the lab?
How does the accidental contamination of food and drink commonly occur in the lab?
What should be worn to provide adequate eye protection when handling solvents and chemicals?
What should be worn to provide adequate eye protection when handling solvents and chemicals?
What is the recommended action if corrosive liquid is spilled on the skin?
What is the recommended action if corrosive liquid is spilled on the skin?
Why should flooding a spillage with water be avoided?
Why should flooding a spillage with water be avoided?
When should protective gloves be replaced?
When should protective gloves be replaced?
What is the best approach to cleaning up extensive spillages involving toxic fumes?
What is the best approach to cleaning up extensive spillages involving toxic fumes?
Why is using solvents to wash spilled chemicals from the skin discouraged?
Why is using solvents to wash spilled chemicals from the skin discouraged?
What should be done after checking rubber or plastic gloves for holes?
What should be done after checking rubber or plastic gloves for holes?
Which of the following is a course of action in case of sensitization to chemicals?
Which of the following is a course of action in case of sensitization to chemicals?
What should workers do before handling any chemical container?
What should workers do before handling any chemical container?
Which of the following is a responsibility of every worker regarding chemical labels?
Which of the following is a responsibility of every worker regarding chemical labels?
What type of signs should be prominently posted in the laboratory?
What type of signs should be prominently posted in the laboratory?
According to the NFPA hazard labeling system, what information must be included on chemical containers?
According to the NFPA hazard labeling system, what information must be included on chemical containers?
What type of cabinet should acids be stored in to prevent corrosion of the storage unit?
What type of cabinet should acids be stored in to prevent corrosion of the storage unit?
What is an inappropriate action regarding chemical labels?
What is an inappropriate action regarding chemical labels?
What should an individual do if they find a dirty or illegible label on a chemical container?
What should an individual do if they find a dirty or illegible label on a chemical container?
What is the recommended initial action if hydrofluoric acid comes into contact with skin?
What is the recommended initial action if hydrofluoric acid comes into contact with skin?
What is required for visitors allowed into the work area of a laboratory?
What is required for visitors allowed into the work area of a laboratory?
Why should nitric acid be stored separately from other acids and organic materials?
Why should nitric acid be stored separately from other acids and organic materials?
Which of the following statements about safety signs in a laboratory is false?
Which of the following statements about safety signs in a laboratory is false?
What is the safest type of container for storing hydrofluoric acid?
What is the safest type of container for storing hydrofluoric acid?
Which of the following is NOT a recommended action when using hydrofluoric acid?
Which of the following is NOT a recommended action when using hydrofluoric acid?
What should be done with contaminated clothing after exposure to hydrofluoric acid?
What should be done with contaminated clothing after exposure to hydrofluoric acid?
Which cream is recommended to treat exposure to hydrofluoric acid?
Which cream is recommended to treat exposure to hydrofluoric acid?
What should be done if hydrogen fluoride vapors are inhaled?
What should be done if hydrogen fluoride vapors are inhaled?
What is the first step to take if a person is lying down quietly after vomiting?
What is the first step to take if a person is lying down quietly after vomiting?
How should you manage a person who is unconscious after an injury?
How should you manage a person who is unconscious after an injury?
What is the best way to stop bleeding from a severe cut or wound?
What is the best way to stop bleeding from a severe cut or wound?
What should you avoid doing to prevent aggravating a wound?
What should you avoid doing to prevent aggravating a wound?
Why is it important to keep a person calm and reassure them after an injury?
Why is it important to keep a person calm and reassure them after an injury?
What action should be taken if blood soaks through the gauze used on a wound?
What action should be taken if blood soaks through the gauze used on a wound?
What should you do if a person has suffered burns?
What should you do if a person has suffered burns?
What critical information should be relayed to a doctor when summoning medical help?
What critical information should be relayed to a doctor when summoning medical help?
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Study Notes
General Handling of Corrosives
- Purchase corrosives in plastic-coated containers to minimize injury risk if dropped.
- Store acids in acid cabinets or corrosion-resistant lined cabinets to prevent interior corrosion.
- Separate nitric acid storage is crucial to avoid reactions with other acids and organic materials.
Hydrofluoric Acid Safety
- Hydrofluoric acid can cause severe burns and can scavenge calcium from skin and bones.
- Use hydrofluoric acid exclusively in functioning fume hoods with appropriate personal protective gear.
- Immediate washing of any skin contact with hydrofluoric acid for at least 5 minutes is essential, followed by medical attention.
- Never store hydrofluoric acid in glass containers; it is usually packaged in plastic bottles.
Chemical Absorption Pathways
- Ingestion can occur via accidental contamination of food, drinks, or tobacco; avoiding mouth suction of pipettes is critical.
- Inhalation is a common route, exposing workers to gases, vapors, dusts, or mists with potentially deadly consequences.
- Direct skin contact leads to absorption; liquids penetrate more than solids or gases, increasing health risks.
Chemical Exposure Prevention
- Use personal protective equipment such as gloves and goggles at all times.
- Perform operations in fume cupboards when inhalation risk exists, additional respiratory protection may be necessary.
- Clean spills immediately using appropriate methods, avoiding water if it spreads the corrosive material.
First Aid for Chemical Exposure
- In the event of skin contact with corrosive substances, wash immediately and seek medical care.
- Keep exposed individuals calm, warm, and avoid giving fluids unless fully conscious.
- Direct pressure should be applied to severe wounds to control bleeding; constant pressure is crucial for effective clotting.
Safety Protocols for Visitors
- All visitors must wear appropriate safety gear when entering the laboratory work areas.
Signs and Hazard Identification
- Utilize the NFPA hazard labeling system for clear communication of safety and hazard information.
- Ensure all chemical containers are labeled correctly, and report any missing or illegible labels.
- Post signs indicating emergency contacts, safety equipment locations, and warnings for hazardous areas or equipment.
Laboratory Responsibility
- Laboratory staff should familiarize themselves with chemical labels, report discrepancies, and ensure proper labeling on containers used for transferring chemicals.
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