Chemical Substances in the Environment
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Questions and Answers

What are TLVs in relation to chemical substances?

  • They are standards for the labeling of chemical substances.
  • They are measures of the concentration of chemical substances in water sources.
  • They are international limits for chemical substances in air intended to prevent adverse health effects. (correct)
  • They are guidelines on the safe storage of chemical substances.

Which of the following describes a teratogen?

  • A substance that is an irritant.
  • A substance that damages genes.
  • A substance that can lead to birth defects. (correct)
  • A substance that causes discomfort when inhaled or ingested.

What is the purpose of establishing a TLV-C (C = ceiling)?

  • To set a maximum allowable concentration for substances with rapid toxic effects. (correct)
  • To measure the toxicity levels of new chemical substances.
  • To track the exposure to chemical substances over a period of 8 hours.
  • To calculate the average concentration of chemical substances in air.

Why is it important to have TLVs for chemical substances?

<p>To prevent adverse health effects from exposure to chemical substances. (C)</p> Signup and view all the answers

What is the main purpose of updating the list of TLVs regularly?

<p>To account for new data on the toxicity of substances and include new substances. (E)</p> Signup and view all the answers

What type of exposure does a TLV aim to limit?

<p>Long-term exposure to low concentrations of chemical substances. (A)</p> Signup and view all the answers

What should be done if a chemical substance does not appear in a national TLV list?

<p>Consult the TLV lists of other countries or toxicological handbooks (A)</p> Signup and view all the answers

What is the significance of avoiding carcinogenic substances?

<p>They are known to cause cancer and must be avoided to prevent health risks (C)</p> Signup and view all the answers

Why is it important to avoid peak exposures to chemical substances?

<p>Short-term exposure to high concentrations can affect health even if TLV is not exceeded over an 8-hour period (C)</p> Signup and view all the answers

What should be the aim while designing new work or living environments in relation to TLVs?

<p>Concentrations of less than a fifth of the TLVs should be achieved (A)</p> Signup and view all the answers

Why should packages of chemicals be labeled appropriately?

<p>To provide information on toxicity and safe use of the substance (A)</p> Signup and view all the answers

What is the preferable focus of measures when dealing with exposure to chemical substances?

<p>Measures at the source of exposure (A)</p> Signup and view all the answers

What action should be taken if a substance's TLV is not listed in any national TLV list, other country's list, or toxicological handbook?

<p>Individual organizations should apply their own standards related to the substance (B)</p> Signup and view all the answers

Why is it necessary to aim for remaining as far below the TLVs as possible?

<p>To provide a margin of safety in case of unexpected exposure or conditions (A)</p> Signup and view all the answers

What is the potential risk associated with exposure to mixtures of substances?

<p>The effects of individual substances can reinforce each other, posing increased health risks (A)</p> Signup and view all the answers

What is the role of IARC publications in relation to known or suspected carcinogens?

<p>Providing a comprehensive overview of known or suspected carcinogens (B)</p> Signup and view all the answers

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