Laboratory Safety Rules DANGER Wear the right clothing for lab work no dangling jewelry.
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Transcript of Laboratory Safety Rules DANGER Wear the right clothing for lab work no dangling jewelry.
LaboratorySafety Rules
DANGER
Wear the right clothing for lab work no
dangling jewelry
Chemical Burns
Chemical burns on feet.
Skin burned by chemicals
FlammableFlammable
ReactiveReactiveHealthHealth
SpecialSpecial
Basic Safety Rules
Use common sense.
No unauthorized experiments. No horseplay.Handle chemicals/glassware with respect.
Safety Features of the Lab
safety showerfire blanketfire extinguisher eye washfume hoodcircuit breaker switch
Safety Equipment
Fire ExtinguisherType A
Type B
Type C
Safety Goggles
Safety Shower
SAFETY in the Science Classroom
Obey the safety contract– Use common sense– No unauthorized experiments– Wear safety glasses– Safety is an attitude!– Don’t take anything out of lab– Read and follow all instructions
Material Safety Data Sheet (MSDS)
• Gives information about a chemical.
• Lists “Dos” and “Don’ts.”
Chemical Exposure
a one-time exposure causes damage
acute exposure chronic exposure
damage occurs after repeated exposure
How Toxic is “Toxic?”
• Flammable• Explosive• Radioactive• Corrosive• Irritant• Toxic
– Chronic toxicityChronic toxicity: low doses repeated over a long period of time
– Acute toxicityAcute toxicity: immediate effect of a substance as a result of a single dose
• “Lethal Dose 50%” LD50
Chemicals may cause harm in many different ways.
the lethal dosage for 50% of animals on which the chemical is tested
LD50
There are various ways an LD50 can be expressed. For example, acetone has the following LD50s:
ORL-RAT LD50: 5,800 mg/kg (orally in a rat)IHL-RAT LD50: 50,100 mg/m3-h (inhaled- rat)SKN-RBT LD50: 20 g/kg (on skin – rabbit)
Toxicity
Which is more toxic?
Chemical A: LD50 = 3.2 mg/kg Chemical B: LD50 = 48 mg/kg
Chemical A is more toxic because less of it proves fatal to half of a given population.
Lead Poisoning
LD50 = mg / kg
Effects: slow mental development lack of concentration
Small children may accidentallyingest lead-based paints that peel
off from window sills and walls.
Knowledge = Safety• Material Safety Data Sheet (MSDS)
– Lists hazards, special handling instructions, and risks associated with a material. Supplied by manufacturer.
• Acute Exposure – Single episode can cause great damage
• Chronic Exposure– Many episodes over a period of time cause
damage• Carcinogen – causes cancer• Mutagen – causes mutations (genetic defects)• Tetragen – causes birth defects• Neurotoxin – severely poisonous and toxic
Read chemical labels.
Follow the instructions and safety precautions stated on the labels.
If you have a spill on the floor or lab bench, call your teacher rather than trying to
clean it up by yourself.
Always report any accident to your teacher immediately.
NEVER take any chemicals out of the lab.
Chemistry labs are full of possible hazards and hazardous situations. Make sure your behavior does not make you a hazard to
yourself and others in lab.No Rough Housing or Horsing Around will be
Tolerated!!