(Cr) Toxicity | ATSDR - CSEM - Agency for Toxic Substances and ...

Agency for Toxic Substances and Disease Registry Chromium Toxicity
Case Studies in Environmental Medicine (CSEM)
Instructions To complete the assessment and posttest, go to www2.cdc.gov/atsdrce/ and
follow the instructions on that page.
You can immediately print your continuing education certificate from your
personal transcript online. No fees are charged.
Posttest 1. Which of the following statements is NOT true?
A. Chromium is excreted in urine and bile as Cr(III).
B. Cr(III) is generally more toxic than Cr(IV).
C. Cr(VI) is absorbed more quickly than Cr(III).
D. Cr(VI) is carcinogenic when inhaled.
2. Which of the following statements is correct?
A. Naturally occurring chromium is usually present as hexavalent Cr(VI).
B. Cr(III) and Cr(VI) are released to the environment primarily from
stationary point sources resulting from human activities.
C. Cr(VI) in the air does not undergo any reaction.
D. Tobacco smoke is a source of chromium intake.
3. Which of the following statements is incorrect?
A. Due to the actions of gastric acid and other components within the
gastrointestinal tract, most of ingested Cr(VI) dosage is converted to
Cr(III)
B. Cr(VI) is reduced to Cr(III) in the lower respiratory tract.
C. Absorption of Cr(VI) compounds can not occur through intact skin.
D. The general population is exposed most often by ingestion through
chromium content in soil, food, and water.
4. EPA’s MCL for chromium in drinking water is which of the following?
A. 50 g/L.
B. 100 g/L.
C. 500 g/L.
D. None of the above.
5. Which of the following is NOT true?
A. Chromium deficiency may result in glucose intolerance.
B. Cr(VI) compounds are irritating and corrosive.
C. Cr(III) readily passes through cell membranes.
D. Chromium compounds may be skin and pulmonary sensitizers.
6. Significant chromium uptake occurs in all of the following EXCEPT
A. Lung.
B. Kidneys.
C. Muscle.
D. Liver.
Page 59 of 67