CHEMICAL SAFETY LEVELS FOR SCHOOL LABORATORIES

1
CHEMICAL SAFETY LEVELS FOR SCHOOL LABORATORIES

• A SYSTEM FOR IDENTIFYING RISKS UPON ENTERING A LAB

2
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

3
CLASSIFICATION OF LABS

• DESIGNATION BASED ON
• HAZARDS OF CHEMICALS BEING USED
• TOXICITY
• FLAMABIITY
• REACTIVITY
• TOXICITY
• NATURE OF THE WORK OR PROCESSES BEING USED

4
CLASSIFICATION OF LABS

• DESIGNATION DETERMINED BY CHO AND DEPARTMENT
  CHAIR
• DESIGNATION CRITERIA
• SAFETY EQUIPMENT AVAILABLE
• EYE WASH
• DELUGE SHOWER
• FUME HOOD
• PURGE FAN
• PERSONAL PROTECTION EQUIPMENT

5
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

6
CSL 1 LOW RISK

• WORK DOES NOT REQUIRE SPECIAL DESIGN FEATURES OR
  CONTAINMENT EQUIPMENT
• CHEMICAL USE HIGHLY RESTRICTED
• LOW HAZARD REAGENTS
• SMALL VOLUMES

7
CSL 1 LOW RISK

• WORKERS ALL TRAINED AND USE GOOD LABORATORY WORK
  PRACTICE, FOLLOW DISTRICT POLICY (CHP)
• EXPOSURE RISK LOW
• EXAMPLE
• INSTRUMENT ROOM

8
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
• gt L. (LIQUIDS)
• gt 0.5 KGM (SOLIDS)

9
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

10
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

11
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

12
CSL 4 HIGH RISK

• SPECIAL ENGINEERING FEATURES AND CONTAINMENT
  EQUIPMENT
• WORK PRACTICES WITH MULTIPLE BARRIERS FOR WORKER
  PROTECTION

13
CSL 4 HIGH RISK

• CHEMICAL USE IS UNRESTRICTED GOVERNED BY
  PRESCRIBED PROTOCOLS FOR HANDLING, STORAGE AND
  DISPOSAL
• SPECIAL FACILITY DESIGN AND EQUIPMENT REQUIRED

14
CSL 4 HIGH RISK

• RISK HIGH RISK OF EXPOSURE AND CONTAMINATION
• EXAMPLE RESEARCH LABS
• SOME INDUSTRIAL LABS
• GOVERNMENT/MILITARY
• LABS

15
STANDARD SAFETY EQUIPMENT CSL 1-4

• FIRE EXTINGUISHERS
• PPE
• GOGGLES
• APRONS
• GLOVES
• RESPIRATORS (NOT FOR HS LABS)
• EYEWASH STATIONS
• DELUGE SHOWERS

16
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

21
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
• HIGHLY TOXIC
• SODIUM CYANIDE
• BROMINE
• SODIUM DIAZIDE

23
EXAMPLES OF HIGH RISK CHEMICALS CLASS 4

• FLAMMABLE (NFPA 4 )
• DIETHYL ETHER
• ACETALDHYDE
• HYDROGEN SULFIDE
• SPECIAL HAZARDS (EHSO LIST)
• HYDROFLUORIC ACID
• ETHIDIUM BROMIDE

24
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

25
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

26
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