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Continuing Education — "The Action Level!®"

VOLUME 2(6), June 2005
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Exposure to Volatile Methacrylates in Dental Personnel
Stig Hagberg, Göran Ljungkvist, Harriet Andreasson, Stig Karlsson and Lars Barregård

1. Which was the main source of exposure to 2-hydroxiethyl
    methacrylate (HEMA) in Swedish dental personnel?

a. The resin of the composite tooth filling material
b. The bonding agent used before the composite
          filling is placed
c. Cold curing acrylates
2. Was there any difference in daily exposure to HEMA between
    dentists and dental nurses?
a. Dentists' exposures were much higher.
b. Dental nurses' exposures were much higher.
c. Dentists' and dental nurses' exposures were
          similar.
A Numerical Study of Worker Exposure to a Gaseous Contaminant: Variations of Body Shape and Scalar Transport Model
Jun Li, Ibrahim Yavuz and Ismail B. Celik

3. Which of the following methods was noted to have a more diffusive
    nature:

a. Lagrangian
b. Eulerian
c. Cartesian
d. Prandtl
4. From this study, the best conclusion that could possibly be drawn
    is that:
a. the lapel and breathing zone concentrations are
          different.
b. no significant difference exists between lapel and
          breathing zone concentrations studied.
c. the study is badly flawed and no conclusion
          should be reached.
Evaluation of a Modified Scavenging System to Reduce Occupational Exposure to Nitrous Oxide in Labor and Delivery Rooms
Ed Chessor, Marieke Verhoeven, Chun-Yip Hon and Kay Teschke

5. The scavenging system for nitrous oxide appeared to do the
    following:

a. decrease concentration by a factor of two;
          increase distance between nurse and patient
b. decrease concentration by a factor of 10;
          decrease distance between nurse and patient
c. increase concentration by a factor of 1.5;
          decrease distance between nurse and patient
d. had no significant effect on concentration or
          distance
Prevalence and Predictors of Residential Health Hazards: A Pilot Study
Susan Klitzman, Jack Caravanos, Deborah Deitcher, Laura Rothenberg, Candice Belanoff, Rachel Kramer and Louise Cohen

6. Which of the following was not noted as a study limitation:

a. Sample size
b. False positive rate for ELISA analysis
c. Range of housing choices
d. Geographical area
Method for the Determination of Perfluorooctanoic Acid in Air Samples Using Liquid Chromatography with Mass Spectrometry
Mary A. Kaiser, Barbara S. Larsen, Barbara J. Dawson, Kristine Kurtz, Robert Lieckfield, Jr., James R. Miller and John Flaherty

7. What is the biggest advantage of the OVS tube over conventional air
    sampling tubes for the measurement of low vapor pressure
    substances that might be present as particulates?

a. It contains XAD resin adsorbent.
b. It has a filter to differentiate particulates
          from vapor.
c. It has transparent glass so you can see any visual
          changes occurring on the resin.
d. It has a polyurethane foam to separate the
          sections from one another.
8. What is the major advantage of using isotopically enriched internal
    standards for chromatographic measurements?
a. They are easy to obtain.
b. They have the same physical properties as the
          substance being measured, so they behave the
          same on the column.
c. They are present in nature.
d. They have the same molecular weight.


Deadline for answers is June 30, 2005.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on July 11, 2005.

 
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