Safe handling, Storage, and Disposal of Chemicals

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Presentation transcript:

Safe handling, Storage, and Disposal of Chemicals Chapter 6

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

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

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

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.

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

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

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 136-137 When and for what purposes are bonding and grounding used? Refer pg 137

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

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

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

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

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.

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-15-162-06-60). 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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