1. Safe handling, Storage, and Disposal of Chemicals
Chapter 6

2. Objectives General procedures for safe handling of chemicals
Safe handling of corrosive, flammable, highly toxic, and highly reactive or explosive chemicals
The importance of avoiding hazardous chemical mixtures
Appropriate procedures for disposal of wastes

3. What are the fundamental principles for handling chemicals?
Plan ahead: Know potential hazards of an experiment before beginning it.
Minimize exposure to chemicals: Use personal protective equipment to prevent chemicals from contacting your skin. Use fume hoods and ventilation devices
Do not underestimate risks: treat all new compounds and substances of unknown toxicity as toxic substances
Be prepared for accidents: Know what to do in case of accidental release of any hazardous substance, know the location of safety equipment, fire alarms and telephones

4. Four Categories of Hazards Chemicals
Corrosive
Irreversible alteration of the site
Acids and bases
Flammable
Ignite easily
Highly reactive or explosive
- Undergo rapid reactions that release energy violently
Carcinogen

5. Homework What are the four Categories of Hazard Chemicals?
What are the four classes of corrosive chemicals?
Mention the difference between a flammable and a combustible liquid.

6. Working with Corrosive Chemicals
Four classes of corrosive chemicals
Strong acids, bases, dehydrating and oxidizing agents
Causes tissue and eye damage
Safe handling: Pg 133
Protect hand by wearing chemical resistant gloves
Work in the hood to avoid vapors
Accidental spills neutralize
Storage: pg 134
Acid/base cabinet

7. Working with Flammable Chemicals
Flammables
Liquids with appropriate flash point or temp
The temp at which a liquid gives off vapor sufficient to form ignitable fuel-air mixture at its surface
OSHA
Combustible: Liquids with flash point of 100F or above
Flammable: Liquids with flash point of below 100F
Storage:
Flammable cabinet

8. Home work
What are the different terms used to define flammability of fuel-air mixtures? Refer pg 136
What are the DOT definitions of combustible or flammable liquids, solids and gases? Refer pg
When and for what purposes are bonding and grounding used? Refer pg 137

9. Working with reactive/explosive chemicals
Highly reactive or explosive
OSHA: a substance in its pure state or as produced or transported , will decompose, condense, or self reactive under conditions of shocks, pressure, or temp.
Handling and storage:
Keep emergency equip. handy
Use explosion shield and hood window
Do not use excessive reagents
Control reagent condition carefully

10. Homework
What are the two basic categories into which reactive or explosive chemicals can be divided? Give an example of each category. Refer pg 141

11. Working with hazardous chemicals
Hazardous substances
Carcinogen: cancer causing
Handling and storage:
Proper gloves and PPE to avoid any skin contact
Area with limited access and special sign must be posted

12. Disposal of hazardous wastes
All waste must be labeled
Do not mix hazards and non hazardous waste
Keep chemically different hazardous waste separate

13. Homework Why should one avoid hazardous chemical combination?
Give examples of inorganic and organic compatible groups.
Define hazardous waste. How are they regulated or who (organization) regulates them? Pg 156
Refer to the diagram on page 159 to understand how unknown wastes are categorized for disposal.

14. This project is funded by a grant awarded under the President’s Community Based Job Training Grant as implemented by the U.S. Department of Labor’s Employment and Training Administration (CB ). NCC is an equal opportunity employer and does not discriminate on the following basis:
against any individual in the United States, on the basis of race, color, religion, sex, national origin, age disability, political affiliation or belief; and
against any beneficiary of programs financially assisted under Title I of the Workforce Investment Act of 1998 (WIA), on the basis of the beneficiary’s citizenship/status as a lawfully admitted immigrant authorized to work in the United States, or his or her participation in any WIA Title I-financially assisted program or activity.

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