Notes and ideas

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Notes and ideas
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E-Waste Science Technology

• E-Waste Elements and Compounds

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Purpose

• Transition from composition of a desktop computer
  c. 2005 use chart handout with statistics
• Relate elements to overall periodic chart
• Chart on each significant element (sample)
• Understand why some elements are useful and why
  some elements are hazardous
• Relate to sources and effects on environment and
  human (toxicology)

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Objectives

• Explain the arrangement of elements in the
  periodic table
• Understand the chemical and physical properties
  of E-waste elements and compounds
• Comprehend the benefits and hazards e-waste
  components

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Terms

• Periodic table
• Element
• Compound
• Atom

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Periodic Table of the Elements
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Chemical Elements in E-Waste

• Heavy metals mostly considered hazardous
• Trace elements some precious metals
• Other elements some valuable

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E-Waste Hazards

• Lead
• Cadmium
• Mercury
• Chromium
• Plastics including PVCs
• Brominated Fire Retardants
• Barium
• Beryllium
• Toners
• Phosphor and Additives

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Element Lead

• Solder
• CRT glass
• Landfill leaching
• Acute effects on humans, plants, animals
• Banned in Gasoline, Paint

82207.2Pb
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Element Cadmium

• Batteries, boards, plastics
• Absorbed through respiration
• Toxic and carcinogenic

48112.4Cd
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Mercury
80200.5Hg

• Components, batteries
• Contaminates water, fish
• Brain damage

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Barium
56137.3Ba

• CRT radiation protection
• Affects animals
• Human effects unknown

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Beryllium
49.012Be

• Plugs, connectors
• Inhallation risk
• Carcinogen, lung cancer, skin irritant

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Chromium

• Corrosion protection
• Toxic leaching from landfills
• Cannot incinerate

2452.0Cr
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Compounds

• Toners
• Phosphors
• Plastics
• PVC
• Brominated Chemicals

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Plastics

• 14 lbs/computer
• 1 billion lbs/yr
• PVC hazards

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Plastics Benefits

• Durable
• Lightweight
• Flexible
• Cost-effective
• Corrosion-resistant
• Excellent insulation properties

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Plastics Hazards-PVC
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Backup
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Periodic Chart of the Elements
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Periodic Chart