BACE Laboratory Safety and Regulations 2 — Questions and Answers
Question 1: What is the OSHA Hazard Communication Standard (HCS) 'Right to Know' law primarily focused on?
- Requiring employers to disclose employee health records to OSHA inspectors
- Ensuring workers have access to information about hazardous chemicals in the workplace through labels and Safety Data Sheets (Correct answer)
- Mandating chemical inventory reporting to federal environmental agencies
- Setting maximum permissible exposure limits for all laboratory chemicals
Correct answer: Ensuring workers have access to information about hazardous chemicals in the workplace through labels and Safety Data Sheets
The HCS (29 CFR 1910.1200) requires chemical manufacturers to provide hazard information via labels and SDSs, and employers to train workers on chemical hazards and make SDSs accessible.
OSHA's Hazard Communication Standard (HCS 2012, aligned with GHS) requires: chemical manufacturers to classify hazards and prepare SDSs and labels; employers to maintain a chemical inventory, provide SDSs, ensure proper labeling, and train employees on hazards and protective measures; and employees have the right to request and receive SDS information.
Question 2: What type of eye protection is required when working with potentially infectious biological materials or chemical splashes?
- Standard prescription eyeglasses provide adequate eye protection
- Chemical splash goggles or a face shield worn over safety glasses (Correct answer)
- UV-blocking sunglasses rated for laboratory use
- Wraparound safety glasses without chemical splash protection
Correct answer: Chemical splash goggles or a face shield worn over safety glasses
Chemical splash goggles seal around the eyes and protect against liquid splashes; standard safety glasses alone do not prevent liquid from entering above, below, or beside the lens.
Safety glasses (even with side shields) have gaps that allow chemical or biological splashes to contact the eyes. Splash goggles (ANSI Z87.1 rated) have sealed, indirect-ventilated designs that prevent liquid ingress from any angle. For high splash potential activities, face shields are worn over goggles for full-face protection.
Question 3: What is the proper first response action when a researcher spills a small volume of a mildly corrosive acid (dilute HCl) on their bare forearm?
- Apply sodium bicarbonate paste immediately to neutralize the acid
- Immediately flush the affected area with large amounts of water for at least 15-20 minutes (Correct answer)
- Apply an acid burn ointment from the first aid kit and cover with a bandage
- Remove clothing and report to a supervisor before rinsing
Correct answer: Immediately flush the affected area with large amounts of water for at least 15-20 minutes
Immediate and copious water flushing for 15-20 minutes dilutes and removes the acid, minimizing tissue damage — neutralization pastes can cause exothermic reactions and should not be applied first.
The ANSI/ISEA Z358.1 standard specifies 15-minute flush time for chemical exposures. Immediate, copious water flushing reduces chemical concentration rapidly, limiting tissue damage. Applying neutralizing agents creates heat from the neutralization reaction, potentially worsening burns, and delays the critical flushing step. After thorough flushing, seek medical attention for all but the most minor exposures.
Question 4: Under OSHA's Bloodborne Pathogen Standard (29 CFR 1910.1030), who must be offered the hepatitis B vaccine at no cost?
- All laboratory employees regardless of job function
- Employees with occupational exposure to blood or other potentially infectious materials (OPIM) (Correct answer)
- Only employees who have had a previous needlestick injury
- Any employee who voluntarily requests it
Correct answer: Employees with occupational exposure to blood or other potentially infectious materials (OPIM)
The standard requires employers to offer hepatitis B vaccination at no cost to employees with occupational exposure risk — those whose jobs involve potential contact with blood or OPIM.
The OSHA Bloodborne Pathogen Standard identifies 'occupational exposure' as the key trigger: any employee whose job duties involve reasonably anticipated contact with blood or OPIM must be offered free hepatitis B vaccine series within 10 working days of initial assignment. Employees may decline with a signed declination form.
Question 5: What is the purpose of a 'Threshold Limit Value — Short Term Exposure Limit' (TLV-STEL) for a chemical?
- It defines the maximum lifetime total dose of a chemical a worker can receive
- It defines the maximum airborne concentration a worker can be exposed to for a 15-minute period without adverse effects (Correct answer)
- It specifies the concentration at which a chemical becomes immediately dangerous to life or health (IDLH)
- It represents the minimum concentration detectable by human smell
Correct answer: It defines the maximum airborne concentration a worker can be exposed to for a 15-minute period without adverse effects
TLV-STEL is the ACGIH exposure limit for short-duration (15-min) peak exposures that should not be exceeded.
ACGIH TLVs provide three types of limits: TLV-TWA (8-hour time-weighted average), TLV-STEL (15-minute short-term exposure limit, maximum 4 times per day with 60-min between exposures), and TLV-C (ceiling, never to be exceeded even momentarily). STELs are important for chemicals with acute irritant or narcotic effects where brief high exposures can cause immediate harm even if the 8-hour TWA is acceptable.
Question 6: When disposing of chemical waste from a laboratory, what must be present on every chemical waste container?
- The date the container was filled and the name of the person who filled it
- A proper chemical waste label showing all chemical contents, associated hazards, and the generating laboratory location (Correct answer)
- Only the hazard class symbol from the GHS system
- A manifest number assigned by the waste disposal company
Correct answer: A proper chemical waste label showing all chemical contents, associated hazards, and the generating laboratory location
EPA and RCRA regulations require chemical waste containers to be clearly labeled with all contents, their hazard characteristics, and the generating location.
Under RCRA (Resource Conservation and Recovery Act), hazardous waste containers must be labeled with: (1) the words 'Hazardous Waste', (2) all chemical names and approximate concentrations, (3) hazard characteristics (flammable, corrosive, toxic, reactive), (4) accumulation start date, and (5) generator name and location. Violations of RCRA waste management requirements can result in significant fines.
BACE Laboratory Safety and Regulations 2
What is the OSHA Hazard Communication Standard (HCS) 'Right to Know' law primarily focused on?