1 chemical safety levels for school laboratories a system for identifying risks upon entering a lab
TRANSCRIPT
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– > L. (LIQUIDS)– > 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
17
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
18
SPECIAL SAFETY EQUIPMENT FOR CLS 2
• DEDICATED STORAGE UNITS
– FLAMMABLE SOLVENTS
– CORROSIVES
– TOXINS
19
SPECIAL SAFETY EQUIPMENT FOR CLS 2
• CARTS OR SAFETY CARRIERS FOR
TRANSPORTATION OF BOTTLES OF
HAZARDOUS REAGENTS
• SPILL KITS
20
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
22
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
27
STANDARD SAFETY PRACTICES FOR CSL 1 - 4
• GOOD HOUSEKEEPING– NEAT– ORDERLY
• LABELS ON ALL SECONDARY CONTAINERS
• ANNUAL CLEAN UP OF REFRIGERATORS