About Risk Assessment Sophia CHENG 3 Nov 2009

Discussion on Risk Assessment

Risk Assessment An analysis of a practical activity to identify hazards and to take precautions to minimise the risk Procedures: Identifying hazards (Materials / Procedures / Equipment) Assessing how likely the hazard will actually cause harm Deciding what control measures to reduce risk to acceptable level Finding how to dispose of hazardous residues

Discussion on Risk Assessment – Sample 1 Investigation: Self-heating pack Risk Assessment Hazardous substances being used or made, hazardous procedures equipment Nature of the hazards Control measures and precautions Emergency action to be taken in case of accident Sources of information Copper Sulphate respiratory tract, eye, skin irritant wear protective gloves, ensure good ventilation eyes: flush with clean water skin: wash with soap and water MSDS No: BSLBP Zinc metal powder may form combustion dust concentrations in air water reaction keep in tightly closed container store in a cool, dry area away from source of heat, moisture inhalation: remove to flesh air ingestion: vomiting immediately MSDS No: Z0858 Iron filings cause irritation to eyes and respiratory tract avoid dust formation and control ignition sources skin contact: wash exposed area with soap and water MSDS No: 17495 Calcium oxide causes severe irritation and burns to every area of contact (react with water) store in cool, dry, ventilated area do not induce vomiting give large quantities of water or milk if available MSDS No: C0462

Opinion on Sample 1 from Teacher A

Response to Risk Assessment – Sample 1 Investigation: Self-heating pack Risk Assessment Hazardous substances being used or made, hazardous procedures equipment Nature of the hazards Control measures and precautions Emergency action to be taken in case of accident Sources of information Copper Sulphate respiratory tract, eye, skin irritant wear protective gloves, ensure good ventilation eyes: flush with clean water skin: wash with soap and water MSDS No: BSLBP Zinc metal powder may form combustion dust concentrations in air water reaction keep in tightly closed container store in a cool, dry area away from source of heat, moisture inhalation: remove to flesh air ingestion: vomiting immediately MSDS No: Z0858 Iron filings cause irritation to eyes and respiratory tract avoid dust formation and control ignition sources skin contact: wash exposed area with soap and water MSDS No: 17495 Calcium oxide causes severe irritation and burns to every area of contact (react with water) store in cool, dry, ventilated area do not induce vomiting give large quantities of water or milk if available MSDS No: C0462

Safety information about chemicals Material Safety Data Sheet (MSDS); CityU http://cd1.edb.hkedcity.net/cd/science/laboratory/safety/msds_ss_2000.pdf International Chemical Safety Cards; ILO http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/index.htm

Hierarchy of Controls Order Control Example 1 Eliminate Removing the hazard, e.g. taking a hazardous piece of equipment out of service 2 Substitute Replacing a hazardous substance or process with a less hazardous one 3 Isolate Isolating the hazard from the person at risk, e.g. using a guard or barrier 4 Engineer Redesign an experiment, piece of equipment or process to make it less hazardous 5 Administrative Adopt safe work practices. Provide appropriate training, instruction or information 6 Personal Protective Equipment Use of lab-coat, gloves, safety glasses, safety footwear, dust masks, face shields, goggles, etc.

Another Example of Risk Assessment Form (1) Title of the experiment / task Hazard identification – Equipment used & experimental design (Consider what hazards are posed by, both the equipment and the experimental procedures. What harm can happen to people or equipment?) Hazard identification – Materials Hazard(s): tick if applicable Hazardous substance Reactants / Products Flammable Toxic Corrosive Harmful Irritant Oxidising Other (Please detail) Control adopted for risk minimization Flammable chemical Volume: small / med. / large □ No ignition sources □ Use in fumehood □ Temp. of reaction controlled at _____ oC □ Other: ____________ Toxic chemical □ Minimize the amount to ________ g/cm3 □ Wear personal protective equipment: ________________ ________________ □ Other: _____________ Corrosive chemical □ Use more dilute chemical of ______ mol/dm3 □ Wear personal protective equipment: _____________ □ Other: ­­­­­­­­­­­­­_____________ Oxidising chemical □ Avoid contact with organic chemicals, reactive metals or metal powders □ Keep away from flammable substances □ Other: ______________ Chronic health □ Perform experiment in fumehood □ Operator awareness □ Avoid if allergic reaction develops □ Other: ­­­­­­­­­­­___________

Another Example of Risk Assessment Form (2) Hazard identification – Materials Hazard(s): tick if applicable Hazardous substance Reactants / Products Flammable Toxic Corrosive Harmful Irritant Oxidising Other (Please detail)

Another Example of Risk Assessment Form (3) Control adopted for risk minimization Flammable chemical Volume: small / med. / large □ No ignition sources □ Use in fumehood □ Temp. of reaction controlled at ____ oC □ Other: ____________ Toxic chemical □ Minimize the amount to ___ g/cm3 □ Wear personal protective equipment: ________________ ________________ □ Other: _____________ Corrosive chemical □ Use more dilute chemical of ______ mol/dm3 □ Wear personal protective equipment: _____________ Oxidising chemical □ Avoid contact with organic chemicals, reactive metals or metal powders □ Keep away from flammable substances □ Other: ______________ Chronic health □ Perform experiment in fumehood □ Operator awareness □ Avoid if allergic reaction develops □ Other: ___________

Another Example of Risk Assessment Form (4) Further risk control measures (List any control measures implemented, which are not listed above.) (Review the current controls using the Hierarchy of Controls: ) Order Control Example 1 Eliminate Removing the hazard, e.g. taking a hazardous piece of equipment out of service 2 Substitute Replacing a hazardous substance or process with a less hazardous one 3 Isolate Isolating the hazard from the person at risk, e.g. using a guard or barrier 4 Engineer Redesign an experiment, piece of equipment or process to make it less hazardous 5 Administrative Adopt safe work practices. Provide appropriate training, instruction or information 6 Personal Protective Equipment Use of lab-coat, gloves, safety glasses, safety footwear, dust masks, face shields, goggles, etc.

Another Example of Risk Assessment Form (5) Source(s) of information Disposal of residues

Example of Risk Assessment - Volhard Method (1)

Example of Risk Assessment - Volhard Method (2)

Example of Risk Assessment - Volhard Method (3)

Example of Risk Assessment - Volhard Method (4)

Thank You!