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Wood Toxicity & Human Response. Marian McGee June 14, 2011 Valley Woodturners. Key Concepts. Structural Components Accessory Components Bioresponse Protection & Control. Structural Components. Cellulose used for paper production long, string like molecule high tensile strength

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wood toxicity human response

Wood Toxicity&Human Response

Marian McGee

June 14, 2011

Valley Woodturners

key concepts
Key Concepts
  • Structural Components
  • Accessory Components
  • Bioresponse
  • Protection & Control
structural components
Structural Components
  • Cellulose
    • used for paper production
    • long, string like molecule
    • high tensile strength
  • Hemicellulose
    • less complex branch
    • likes to link lignin and cellulose
  • Lignin
    • most complex
    • responsible for the strength and rigidity of the substance
    • classifiable
      • Hardwoods
      • Softwoods
      • grasses
accessory substances extractives
Accessory Substances/Extractives
  • Fats, resins, oils, waxes
  • Proteins, gums, latex, mucus, starch & sugars
  • Alkaloids, dyes, tannins, glycosides camphor, perfumes
  • Inorganic and organic salts and acids
  • Minerals(e.g. calcium, potassium, sodium, etc.)
quinones
Quinones
  • Chemicals in the wood’s lignin, hemicellulose and cellulose
    • designed as a defense against fungus and other predators (including woodturners)
    • particular to a species and probably to related species
bioresponse
Bioresponse
  • Skin/dermis
  • Respiratory system
  • Cardiovascular system
  • Neurological system
  • Endocrine system
allergic reaction
Allergic Reaction
  • Phase 1
    • penetrates the white blood cells in the epidermis
    • travels to lymph nodes where T cells may or may not recognize the “invader”
bioresponse phase
Bioresponse Phase
  • Reaction
    • the T cells release a protein which will attract white blood cells to fight and destroy everything close by
        • (including skin cells – rash & blisters)
    • may also manifest redness
        • (vasodilation) & itching (neurological response)
    • Anaphylaxis – rapid physical ‘shutdown’ and ****!!!!!
    • initially undetected physical response****!!!!
outcomes consequences
Outcomes/Consequences
  • Possible:
    • headaches
    • bronchitis, rhinitis
    • sinusitis
    • dermatitis
    • cancers
        • nasal,
        • throat,
        • lungs,
        • skin,
        • endocrine
critical equation
Critical Equation!!!

Element(s) of the wood

+

Dosage

(i.e. the length of exposure & the number of undesirable molecules)

+

Strength/Power

(of the wood molecules)

+

Vulnerability

(of the person)

=

Your Level of Risk

protection control
Protection & Control
  • Understand
    • the profile of your wood – its growth site, potency
  • Learn
    • your personal vulnerabilities/sensitivities – skin, respiratory, gastro intestinal, eyes, etc.
  • Take
    • appropriate protective action
      • e.g.
        • Full respiratory protection & dust control
        • Hand washing and well fitted gloves
        • Workshop clothes and face shield
references
References
  • Woods Toxic to Man – author unknown
  • Vancouver Woodturners Guild
  • Meir, Eric – Wood Allergies and Toxicity
  • BMEzine Encyclopaedia – Wood Hazards
  • Wood Toxicity Table – Toxic Woods Information Sheet #30
  • www.wood-database.com/wood-articles/wood-allergies-and-toxicity/
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