Transcript CHEMICAL SAFETY LEVELS FOR SCHOOL LABORATORIES

CHEMICAL SAFETY
LEVELS FOR
SCHOOL
LABORATORIES
A SYSTEM FOR IDENTIFYING
RISKS UPON ENTERING A LAB
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CLASSIFICATION OF LABS
• CSL PROPOSED AS A GUIDELINE TO
ASSIST CHO AND STAFF
• CSL DETERMINED BY:
– RISK OF EXPOSURE TO HAZARDOUS
CHEMICALS
– FACILITY SURVEY
– TYPES OF PROCEDURES BEING USED
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CLASSIFICATION OF LABS
• DESIGNATION BASED ON:
– HAZARDS OF CHEMICALS BEING USED
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TOXICITY
FLAMABIITY
REACTIVITY
TOXICITY
– NATURE OF THE WORK OR
PROCESSES BEING USED
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CLASSIFICATION OF LABS
• DESIGNATION DETERMINED BY CHO AND
DEPARTMENT CHAIR
• DESIGNATION CRITERIA
– SAFETY EQUIPMENT AVAILABLE
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EYE WASH
DELUGE SHOWER
FUME HOOD
PURGE FAN
– PERSONAL PROTECTION EQUIPMENT
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CLASSIFICATION OF LABS
- DESIGNATION CRITERIA
• CHEMICALS BEING USED
• LAB ACTIVITIES OR OTHER PROCEDURES
• APPROPRIATE SUPERVISON
• NATURE OF THE STUDENTS
– AGE
– LEVEL OF TRAINING
• ROOM DESIGN
– EXITS
– CLEAR AISLES
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CSL 1 LOW RISK
• WORK DOES NOT REQUIRE
SPECIAL DESIGN FEATURES OR
CONTAINMENT EQUIPMENT
• CHEMICAL USE HIGHLY
RESTRICTED
– LOW HAZARD REAGENTS
– SMALL VOLUMES
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CSL 1 LOW RISK
• WORKERS ALL TRAINED AND USE GOOD
LABORATORY WORK PRACTICE, FOLLOW
DISTRICT POLICY (CHP)
• EXPOSURE RISK LOW
• EXAMPLE:
– INSTRUMENT ROOM
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CSL 2 MODERATE RISK
• CHEMICALS WITH LOW TO
MODERATE RISK USED OPENLY
– REAGENTS OF HAZ LEVEL 1 AND 2
• VOLUMES OF HAZ LEVEL 3
REAGENTS ARE RESTRICTED
– > L. (LIQUIDS)
– > 0.5 KGM (SOLIDS)
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CSL 2 MODERATE RISK
• HAZARD CLASS 4 REAGENTS NOT
PERMITED EXPECT BY PRIOR WRITTEN
SPECIAL EXEMPTION FROM CHO
• RISK LEVEL
MODERATE
• EXAMPLE: HIGH SCHOOL CHEM LAB
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CSL 3 SUBSTANCIAL RISK
• ENGINEERING CONTROLS REQUIRED
– FUME HOODS
– PURGE FANS
• CHEMICALS OF SUBSTANCIAL AND HIGH
(2,3) RISK UNRESTRICTED
• HAZARD LEVEL 4 REAGENTS PERMITED
BUT MUST BE REPORTED
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CSL 3 SUBSTANCIAL RISK
• QUANTITIES OF REAGENTS LIMITED
BY NEED AND FIRE CODE
• RISK SUBSTANCIAL
– CONTROLLED BY ENGINEERING
DEVICES, MINIMIZING QUANTITIES,
AND CAREFUL WORK PRACTICES
• EXAMPLE UNIVERSITY CHEM LAB
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CSL 4 HIGH RISK
• SPECIAL ENGINEERING FEATURES
AND CONTAINMENT EQUIPMENT
• WORK PRACTICES WITH MULTIPLE
BARRIERS FOR WORKER
PROTECTION
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CSL 4 HIGH RISK
• CHEMICAL USE IS UNRESTRICTED;
GOVERNED BY PRESCRIBED
PROTOCOLS FOR HANDLING,
STORAGE AND DISPOSAL
• SPECIAL FACILITY DESIGN AND
EQUIPMENT REQUIRED
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CSL 4 HIGH RISK
• RISK HIGH RISK OF EXPOSURE
AND CONTAMINATION
• EXAMPLE RESEARCH LABS
SOME INDUSTRIAL LABS
GOVERNMENT/MILITARY
LABS
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STANDARD SAFETY
EQUIPMENT CSL 1-4
• FIRE EXTINGUISHERS
• PPE
– GOGGLES
– APRONS
– GLOVES
– RESPIRATORS (NOT FOR HS LABS)
• EYEWASH STATIONS
• DELUGE SHOWERS
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STANDARD SAFETY
EQUIPMENT CSL 1-4
• FURNITURE
– BENCH TOP NON POROUS,CHEMICAL
RESISTANT
– STURDY WORKABLE FURNITURE IN
GOOD REPAIR
• AISLES
– MIN. 44 IN WIDE
– NOT USED FOR STORAGE OR
EQUIPMENT PLACEMENT
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STANDARD SAFETY
EQUIPMENT CSL 1-4
• LAB AIR NOT RECIRCULATED TO
REST OF BUILDING
• NEGATIVE AIR PRESSURE WITH
RESPECT TO CORRIDORS
• OUTDOOR INTAKES LOCATED SO AS
TO NOT RECAPTURE LAB VAPOR
EXHAUST
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SPECIAL SAFETY
EQUIPMENT FOR CLS 2
• DEDICATED STORAGE UNITS
– FLAMMABLE SOLVENTS
– CORROSIVES
– TOXINS
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SPECIAL SAFETY
EQUIPMENT FOR CLS 2
• CARTS OR SAFETY CARRIERS FOR
TRANSPORTATION OF BOTTLES OF
HAZARDOUS REAGENTS
• SPILL KITS
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SPECIAL WORK
PRACTICES FOR CSL 2
•CONTROL MOVMENT OF VISITORS
• CHEMICALS OF HAZARD CLASS 2-4
SHOULD BE USED IN FUME HOODS
• FACILITY SHOULD BE LOCKED
DURING NON WORKING HOURS
• SEPARATE WORK AND DESK AREAS
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EXAMPLES OF HIGH RISK
CHEMICALS CLASS 4
• CARCINOGENS
– BENZINE
– CHROME VI IONS
– FORMADEHYDE
• REACTIVE / EXPLOSIVE
– PERCHLORIC ACID
– PICRIC ACID
– HYDROGEN PEROXIDE
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EXAMPLES OF HIGH RISK
CHEMICALS CLASS 4
• STRONG OXIDIZING AGENTS
– NITRIC ACID
– CHLORINE
– OXYGEN
• HIGHL Y TOXIC
– SODIUM CYANIDE
– BROMINE
– SODIUM DIAZIDE
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EXAMPLES OF HIGH RISK
CHEMICALS CLASS 4
• FLAMMABLE (NFPA 4 )
– DIETHYL ETHER
– ACETALDHYDE
– HYDROGEN SULFIDE
• SPECIAL HAZARDS (EHSO LIST)
– HYDROFLUORIC ACID
– ETHIDIUM BROMIDE
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STANDARD SAFETY
PRACTICES FOR CSL 1 - 4
• MINIMIZE EXPOSURE TO ALL
LABORATORY CHEMICALS
– QUANTITY IN LAB, AND, IN
PROCEDURES
– VENTILATION / ENGINEERING
CONTROLS
• EYE PROTECTION REQUIRED
• PROTECTIVE GLOVES
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STANDARD SAFETY
PRACTICES FOR CSL 1 - 4
• PLANNING PRINCIPLES
– CHEMICALS WITH INHERENT HAZARDS
AND BE USED IN FACILITY
– SUBSITUTE LESS HAZARDOUS
REAGENTS WHEN POSSIBLE
– USE SMALLEST QUANTITY POSSIBLE
– PURCHASE MINIMIUM QUANTITY
NEEDED FOR LAB PROCEDURES
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STANDARD SAFETY
PRACTICES FOR CSL 1 - 4
• LIMIT ACCESS TO LAB DURING
OPERATIONS
• SIGNAGE
– HAZARDS IN USE
– LOCATION OF SAFETY EQUIPMENT
– EXITS
– CONTACTS
– CSL DESIGNATION
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STANDARD SAFETY
PRACTICES FOR CSL 1 - 4
• GOOD HOUSEKEEPING
– NEAT
– ORDERLY
• LABELS ON ALL SECONDARY
CONTAINERS
• ANNUAL CLEAN UP OF
REFRIGERATORS
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