Environment, health and safety

Why is skin contact with concentrated TMAH (tetramethylammonium hydroxide), used in developers, considered especially dangerous?

  1. ABecause it emits strong radiation
  2. BBecause it is absorbed through the skin and can interfere with nerve and muscle function, causing systemic poisoning such as respiratory arrest
  3. CBecause it instantly freezes and causes frostbite
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Answer: B. Because it is absorbed through the skin and can interfere with nerve and muscle function, causing systemic poisoning such as respiratory arrest

TMAH not only damages skin as a strong alkali, but tetramethylammonium ions absorbed through the skin can block signal transmission from nerves to muscles and cause respiratory arrest and the like. Fatal accidents from contact with concentrated solutions have been reported, so wearing protective equipment and washing immediately and seeking medical care after contact are important.

  • A. TMAH is not radioactive.
  • B. Correct. Systemic poisoning through skin absorption is the danger.
  • C. It is not a substance that causes frostbite.
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