Agar Cube Cell Size Experiment Laboratory Risk Assessment

Assessment Date: [DATE]

Assessor: [ASSESSOR NAME]

Department/Area: [DEPARTMENT/AREA]

Review Date: [REVIEW DATE]

1. Assessment Scope

This assessment covers the preparation, handling, cutting, measurement, observation, and disposal activities associated with an agar cube cell size experiment in a school laboratory. It includes the use of scalpels or other cutting equipment, handling of agar cubes as a biological model, contact with dilute indicator or staining solutions if used, bench-top spill response, routine waste disposal, and supervision of student practical work. The assessment applies to normal classroom laboratory conditions, including setup, active experimentation, cleanup, and storage of materials. It excludes large-scale chemical preparation, microbiological culturing of live organisms, and any activity involving hazardous reagents beyond the low-hazard materials specified for the experiment. Where the experiment is adapted to include additional chemicals, dyes, preservatives, or heated equipment, the assessment must be reviewed and amended before use.

2. Risk Assessment Methodology

A task-based job hazard analysis was used to identify hazards at each stage of the experiment and to evaluate the likelihood and severity of harm before and after controls. Controls were selected using the hierarchy of controls, prioritizing elimination, substitution, engineering controls, administrative controls, and PPE in that order. PPE was treated as the last line of defense and used only where residual risk remained after higher-level controls were applied. The assessment also considers school laboratory supervision, COSHH-style chemical awareness, safe work practices for sharp tools, and emergency preparedness for cuts, spills, and accidental ingestion or eye contact.

3. Risk Matrix Reference

The following matrix is used to evaluate risk levels based on likelihood and severity:

		Likelihood
Rare	Unlikely	Possible	Likely	Almost Certain
Severity	Catastrophic	Low	Low	Low	Medium	Medium
Major	Low	Low	Medium	Medium	High
Moderate	Low	Medium	Medium	High	High
Minor	Medium	Medium	High	High	Extreme
Negligible	Medium	High	High	Extreme	Extreme

4. Hazard Identification and Risk Evaluation

1. Use of scalpels, craft knives, or other cutting tools to trim agar into cubes creates a laceration and puncture hazard, especially during cutting toward the hand or when blades are dull, slippery, or poorly controlled.

Potential Consequences: Cuts to fingers or palms, deep lacerations requiring first aid or medical treatment, contamination of the sample or work area with blood, and distraction leading to secondary incidents.

Affected Persons: Students, teachers, laboratory technicians, and any assistant handling the cutting process.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Major	High

Control Measures

• Eliminate unnecessary cutting by supplying pre-cut agar cubes where practicable.
• Use a cutting board or tile with a non-slip base and a blade-safe work position that keeps hands out of the cutting path.
• Provide safety scalpels or retractable blades where available, and keep blades sharp to reduce force and slipping.
• Require direct teacher supervision for all blade use and restrict cutting tasks to trained, competent persons only.
• Use cut-resistant gloves only where they do not create a greater entanglement or loss of dexterity hazard; otherwise rely on safe technique and tool control.
• Store blades safely, issue them only when needed, and dispose of used blades in a designated sharps container.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Moderate	Medium

2. Handling agar cubes and measuring their dimensions can involve repetitive hand movements, awkward posture, and minor slips while transferring cubes between containers, rulers, and work surfaces.

Potential Consequences: Minor cuts or abrasions, strain from repetitive handling, dropped samples, and reduced accuracy of measurements due to poor handling technique.

Affected Persons: Students and staff conducting the practical.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Likely	Minor	Medium

Control Measures

• Organize the workspace so that cutting, measuring, and recording are done in a clear sequence with minimal reaching.
• Use trays or shallow dishes to contain cubes and reduce the chance of dropping them.
• Demonstrate correct handling technique before the practical and limit the number of cubes handled at one time.
• Provide adequate bench space and seating/standing arrangements to reduce awkward posture.
• Pause work if students show poor control or fatigue and re-demonstrate the task as needed.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Minor	Low

3. Agar cubes may be used as a biological model or may be treated with indicator solutions, dyes, acids, or alkalis to simulate diffusion. These materials can present low-level chemical exposure risks if splashed, touched, or ingested.

Potential Consequences: Skin or eye irritation, staining, accidental ingestion, allergic reaction in sensitive individuals, and contamination of benches or clothing.

Affected Persons: Students, teachers, technicians, and cleaners who may contact residues.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Moderate	Medium

Control Measures

• Substitute the least hazardous indicator or dye that will achieve the learning objective, and avoid unnecessary additives.
• Review the safety data sheet or supplier information for all chemicals used and confirm suitability for school use before the lesson.
• Keep quantities small and use only dilute solutions prepared in advance by competent staff.
• Use clearly labelled containers and prevent students from decanting or mixing chemicals without instruction.
• Provide immediate access to running water for rinsing and ensure no food or drink is present in the laboratory.
• Wash hands after handling materials and before leaving the laboratory.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Minor	Low

4. Spills of water, agar solution, or dilute chemical solutions can create slip hazards and may spread contamination across benches, floors, or equipment.

Potential Consequences: Slips, trips, falls, contamination of clothing or skin, damage to books or electrical equipment, and delayed cleanup leading to wider exposure.

Affected Persons: Students, staff, cleaners, and anyone walking through the laboratory.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Likely	Minor	Medium

Control Measures

• Use spill trays or absorbent bench protection where practical.
• Keep liquids away from bench edges and maintain clear walkways.
• Clean spills immediately using a simple, rehearsed spill procedure appropriate to the material involved.
• Restrict access to the affected area until the surface is dry and safe.
• Use non-slip footwear as part of normal school laboratory dress requirements where applicable.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Minor	Low

5. Improper disposal of agar, contaminated disposables, blades, or chemical residues can expose others during waste handling and create hygiene or sharps hazards.

Potential Consequences: Cuts from sharps, unpleasant odours, blocked sinks, contamination of bins, and exposure of waste handlers to residual chemicals or biological material.

Affected Persons: Students, laboratory staff, cleaners, and waste contractors.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Moderate	Medium

Control Measures

• Segregate waste at source into general waste, sharps, and any chemical waste streams required by the school.
• Dispose of blades and broken glass only in approved sharps or rigid waste containers.
• Do not place agar blocks or solids into sinks unless the school’s local procedure explicitly permits it.
• Keep contaminated paper towels and disposable gloves in the designated waste stream.
• Brief students on waste segregation before the practical and supervise disposal at the end of the lesson.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Minor	Low

6. Inadequate supervision, poor classroom control, or students working beyond their competence increases the likelihood of misuse of sharp tools, horseplay, chemical contact, and unsafe movement around the laboratory.

Potential Consequences: Cuts, spills, eye injuries, dropped equipment, and escalation of minor incidents into more serious events.

Affected Persons: Students, supervising staff, and nearby classes if the incident spreads beyond the room.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Likely	Moderate	High

Control Measures

• Ensure the practical is led by a competent teacher or technician who has assessed the task in advance.
• Set clear behavioural rules, stop-work signals, and movement restrictions before materials are issued.
• Issue tools and chemicals only when students are ready to use them and collect them back promptly after use.
• Use small working groups where supervision can be maintained effectively.
• Remove or postpone the practical if adequate supervision cannot be provided.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Moderate	Medium

7. Eye exposure may occur from splashes, blade fragments, or contact with contaminated fingers when students rub their eyes during the practical.

Potential Consequences: Eye irritation, minor injury, temporary discomfort, or more serious injury if a sharp fragment or chemical splash reaches the eye.

Affected Persons: Students and staff in the immediate work area.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Major	High

Control Measures

• Position work so that cutting and liquid handling are done below eye level and away from the face.
• Require safety glasses or goggles where splash or fragment risk exists.
• Prohibit touching the face during the practical and require handwashing before leaving the room.
• Keep blades and broken materials pointed away from the body and other people.
• Provide immediate access to an eyewash station or suitable eye-rinse arrangement.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Moderate	Medium

8. Poor housekeeping, cluttered benches, and carrying tools or samples around the room can create trip, collision, and dropped-object hazards.

Potential Consequences: Trips and falls, dropped scalpels or containers, damaged samples, and secondary cuts or spills.

Affected Persons: Students, staff, and visitors entering the laboratory.

Initial Risk Assessment

Likelihood	Severity	Risk Rating
Possible	Minor	Medium

Control Measures

• Keep benches clear except for the materials needed for the current step.
• Store bags, coats, and unnecessary equipment away from the work area.
• Require students to remain seated or in designated positions during cutting and measurement.
• Use stable containers and avoid carrying open liquids across the room unless necessary.
• Maintain clear access to exits, sinks, and emergency equipment at all times.

Residual Risk Assessment

Likelihood	Severity	Risk Rating
Unlikely	Minor	Low

5. General Control Measures

• Apply school laboratory rules consistently, including no eating or drinking, no horseplay, and immediate reporting of incidents or near misses.

Reinforce these rules at the start of the lesson and stop the activity if behaviour becomes unsafe.

• Prepare the practical in advance so that all materials, labels, waste containers, and cleaning supplies are ready before students begin.

Pre-lab preparation reduces handling errors, unnecessary movement, and unsupervised access to tools or chemicals.

• Use the least hazardous materials and smallest practical quantities needed to achieve the learning objective.

This supports COSHH-style control by reducing exposure potential and simplifying spill response and disposal.

• Ensure the laboratory has suitable first aid, eyewash access, spill materials, and a clear route to emergency exits.

Check that emergency equipment is accessible and that staff know the local response procedure before the lesson starts.

• Maintain effective supervision throughout the practical, with staff actively observing cutting, chemical handling, and cleanup.

Do not leave students unattended with scalpels, liquids, or waste materials.

6. Emergency Preparedness

• For cuts from scalpels or sharp edges, stop the task immediately, apply first aid, control bleeding with clean dressings, and escalate to the school first aider or emergency services if the wound is deep, contaminated, or bleeding heavily. Remove the blade from service and secure it before resuming work.
• For eye splashes, escort the affected person to the eyewash station immediately and irrigate the eye continuously in line with local school procedure. Seek medical advice if irritation persists or if a chemical splash is involved.
• For chemical or dye spills, isolate the area, prevent students from walking through the spill, use the appropriate absorbent or cleanup method for the material involved, and dispose of cleanup materials in the correct waste stream. Escalate any spill that is larger than the class can safely manage.
• For accidental ingestion or skin contact with indicator solutions or other additives, remove contaminated clothing if necessary, rinse the affected area with water, and follow the product safety information and school incident procedure.
• For sharps incidents or broken glass, do not pick up fragments by hand. Use tongs, brush and pan, or a designated sharps container, and report the incident so the area can be checked before reuse.

7. Training Requirements

• Safe Use of Scalpels and Cutting Equipment: Students and staff must be trained to hold the blade away from the body, cut on a stable surface, use controlled pressure, and stop immediately if the blade slips or becomes damaged. Training must also cover blade storage, issue and return procedures, and safe disposal of used blades. [1] [2]
  • Demonstrate correct hand position and cutting direction.
  • Explain why blades must never be passed hand-to-hand.
  • Show how to report a damaged or loose blade holder.
• Chemical Awareness and COSHH-Style Handling: Users must understand the hazards of any indicator, dye, preservative, or cleaning chemical used in the experiment, including safe handling, storage, spill response, and disposal. Training should emphasize reading safety information before use and using the smallest practical quantity. [4]
  • Review labels and safety data sheets before the lesson.
  • Explain what to do if a chemical contacts skin or eyes.
  • Confirm that students know not to taste or inhale materials intentionally.
• Laboratory Behaviour and Supervision Expectations: Students must be trained in classroom laboratory rules, including movement control, no horseplay, prompt reporting of spills or injuries, and remaining within the assigned work area. Supervisors must be trained to maintain active oversight and intervene early when unsafe behaviour appears. [5]
  • Explain stop-work instructions and emergency signals.
  • Set expectations for bench tidiness and waste segregation.
  • Require students to wait for permission before collecting tools or chemicals.
• PPE Selection, Use, and Limitations: Users must be trained on the correct PPE for the task, how to wear it properly, when it is required, and its limitations. PPE should be matched to the hazard and used alongside other controls rather than as the primary control measure. [6] [3]
  • Safety glasses or goggles for splash and fragment protection.
  • Lab coat or apron to protect clothing from minor spills.
  • Gloves only where they are suitable for the material and task.
  • Replace damaged PPE immediately.

8. Monitoring and Review

Review Frequency: Annually and after any incident, near miss, change in materials, or change in the practical method.

Monitoring Type	Frequency	Responsible Party	Description
Regular Inspection	Before each practical session	Teacher or laboratory technician	Check scalpels, cutting boards, containers, eyewash access, spill materials, waste containers, and bench condition before students begin. Remove damaged tools from service immediately.
Supervisory Observation	Continuously during the practical	Teacher	Observe student technique, behaviour, and compliance with instructions, especially during cutting, liquid handling, and disposal. Intervene promptly if unsafe actions occur.
Housekeeping and Waste Check	At the end of each lesson	Laboratory technician or teacher	Confirm that blades, broken items, contaminated disposables, and agar waste have been disposed of correctly and that benches, sinks, and floors are clean and dry.
Periodic Review	Termly or after any incident/near miss	Science department lead or designated safety coordinator	Review incident reports, near misses, student feedback, and any changes to materials or method. Update controls if the practical is modified or if repeated issues are identified.

9. Special Circumstances

• If the practical is carried out in low light, after school, or during a busy timetable period, supervision and housekeeping standards must be increased because distraction and reduced visibility can raise the likelihood of cuts and spills.
• If students work alone or in very small groups, the teacher must confirm that direct supervision remains adequate and that emergency assistance can be summoned immediately.
• If the experiment is adapted for outdoor or field use, weather, temperature, wind, and transport of materials must be considered because these conditions can increase spill, contamination, and sample loss risks.
• If additional chemicals, heated agar, or alternative cutting devices are introduced, the risk assessment must be revised before the lesson is delivered because the hazard profile will change significantly.

Approval and Sign-off

This risk assessment has been reviewed and approved by:

Assessor: _________________________ Date: __________

Manager/Supervisor: _________________________ Date: __________

Safety Representative: _________________________ Date: __________

This risk assessment must be reviewed annually and after any incident, near miss, change in materials, or change in the practical method. or when significant changes occur.

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