Which of the following statements about lab safety are correct? Select all that apply.

Question

BlackTom AI · Accepted Answer

Personal protective equipment (PPE) must be worn and managed to prevent contamination, and hazards such as broken glass must be reported immediately.

1) Relevant knowledge points and concepts
- PPE protocol: safety glasses, lab coats, and gloves should be worn whenever there is a risk of exposure; gloves that become contaminated must be removed and disposed of in the correct hazardous-waste stream.  
- Contamination control: do not touch personal items or communal surfaces with contaminated gloves.  
- Incident/reporting: broken glass and other hazards should be reported to the instructor or lab staff so trained personnel can clean up safely.  
- Lab cleanup responsibilities vary, but handing chemically contaminated glassware directly to staff is usually inappropriate; follow your lab’s decontamination procedures.

2) Step-by-step reasoning
- Option c: If a chemical stain appears on gloves, continuing to work risks spreading contamination. Step 1: stop the activity. Step 2: remove contaminated gloves carefully to avoid skin contact. Step 3: dispose of them in the designated hazardous/toxic solid waste container or follow institution-specific disposal guidance. This sequence is correct and safe.  
- Option d: Broken glass creates cut and contamination hazards. Step 1: stop and cordon the area if possible. Step 2: immediately inform the instructor/lab staff. Trained personnel will use appropriate tools (brush, dustpan, sharps container) to clean it up. Reporting immediately minimizes injury risk. This is correct.

3) Calculations
- None required.

4) Why the correct answers are correct
- c is correct because contaminated gloves must be changed and disposed of properly to prevent exposure.  
- d is correct because broken glass must be handled by trained staff and reported immediately to avoid injury and contamination spread.

5) Why other options are incorrect
- a is incorrect: PPE should be put on before handling materials or occupying a bench area where hazards exist; delaying donning PPE increases exposure risk.  
- b is incorrect: students should typically rinse/clean or follow lab-specific procedures for dirty glassware; handing contaminated glassware directly to staff is not standard practice.  
- e is incorrect: wiping contaminated gloves and using a phone still spreads contamination; remove gloves and wash hands before touching personal devices.

Conclusion: The correct selections are c and d, which matches the provided answer.

Which of the following statements about lab safety are correct? Select all that apply.多项选择题

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