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Continuing Education — "The Action Level!®"

VOLUME 4(10), October 2007
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Toxicokinetics of Methyl tert-Butyl Ether (MTBE) and tert-Amyl Methyl Ether (TAME) in Humans and Implications to their Biological Monitoring
Sinikka Vainiotalo, Vesa Riihimäki, Kaija Pekari, Eija Teräväinen and Antero Aitio

1. Which of the following statements is NOT correct?

a. MTBE and TAME possess fairly low solubility
          in water and blood.
b. MTBE has more than two times higher solubility
          in fat than TAME.
c. The metabolites tert-butanol (TBA) and tert-amyl
          alcohol (TAA) are highly soluble both in water
          and blood.
d. The pulmonary retention of MTBE is lower than
          that of TAME.
e. The respiratory excretion of MTBE is higher than
          that of TAME.
2. The elimination of the metabolites TBA and TAA is faster than
    that of the parent ethers MTBE and TAME. True or False?
True
False
Crystalline Silica Dust and Respirable Particulate Matter During Indoor Concrete Grinding — Wet-grinding and Ventilated-grinding Compared to Uncontrolled Conventional-grinding
Farhang Akbar-Khanzadeh, Sheryl Milz, April Ames, Pamela Susi, Michael Bisesi, Sadik Khuder and Mahboubeh Akbar-Khanzadeh

3. The results of this study indicate that the application of local
    exhaust ventilation (LEV) during concrete grinding:

a. can effectively reduce the levels of silica dust
          to below the acceptable level.
b. may not reduce the levels of silica dust to below
          the acceptable level.
c. is not practical at this time.
d. reduces the levels of silica dust considerably
          lower than the application of the wet-grinding
          method.
4. Which statement is NOT correct?
a. Shroud used in some LEVs poses problems for
          the workers such as an inability to reach corners
          and limited visibility for the work area.
b. Engineering dust control methods during concrete
          grinding are not generally used.
c. Dust reduction methods during concrete grinding
          have to be factory designed and manufactured,
          otherwise they will not reduce the dust levels
          at all.
d. The wet-grinding dust control method generates
          a slurry deposit on the floor that must be disposed
          of or it can create electrocution and slipping
          hazards.
Effects of Cross-Sectional Partitioning on Active Noise Control in Round Ducts
Jeremy Slagley and Steven Guffey

5. Partitioning large ducts with axial vane splitters facilitated better
    active noise control at middle frequencies than using the large
    ducts alone. True or False?

True
False
6. Of the three studies discussed in this article, which one returned
    the highest active noise control in the middle frequency range?
a. Study I – single system with inactive inner duct
b. Study II – dual system with both inner and outer
          duct active
c. Study III – cross-shaped splitter with single
          quadrant active
A Modified Marple-Type Cascade Impactor for Assessing Aerosol Particle Size Distributions in Workplaces
Yi-Hsuan Wu and James H. Vincent

7. Under a known calm air exposure condition, what is the major
    characteristic of a passive aerosol sampler affecting particles
    passing through the sampling inlet?

a. Collection efficiency
b. Aspiration efficiency
8. With known information about the approximate vicinity of particle
    sizes in a workplace, it is possible to use a modified-Marple
    cascade impactor with a smaller number of impaction stages to
    obtain the information about the particle size distribution with
    acceptable accuracy. True or False?
True
False
Handheld Photoionization Instruments for Quantitative Detection of Sarin Vapor and for Rapid Qualitative Screening of Contaminated Objects
Philip A. Smith, Carmela Jackson Lepage, Kristin L. Harrer and Paul J. Brochu

9. The photoionization detectors used by the researchers to detect
    airborne sarin can easily detect sarin concentrations at levels
    low enough to warn unprotected members of the general public
    of the exposure hazard. True or False?

True
False
10. The most significant difference between the handheld
      photoionization detectors and the handheld ion mobility
      spectrometer used in this study is:
a. the photoionization detectors generally have
          longer recovery times.
b. a radioactive source is present in each
          photoionization detector.
c. neither type of detection system is suitable for
          screening objects potentially contaminated with
          highly dangerous chemicals.
d. the photoionization detectors generally have
          shorter recovery times.
A Case-Crossover Study of Transient Risk Factors for Occupational Hand Trauma by Gender
David A. Lombardi, Gary S. Sorock, Leslie Holander and Murray A. Mittleman

11. Given that the time interval for each exposure under study was
      very short, the incidence rate ratio can be interpreted as the long
      term risk of a sudden onset hand injury. True or False?

True
False
12. The case-crossover study is a within subject design; both
      measured and unmeasured stable factors cannot be evaluated
      as risk factors for injury because they do not vary within an
      individual over a short time interval. True or False?
True
False
Performance of Membrane Filters Used for TEM Analysis of Asbestos
James S. Webber, Alex G. Czuhanich and Laurie J. Carhart

13. Which of the following is NOT a possible consequence of
      collapsing mixed-cellulose-ester filters (MCEFs) using the
      "hot-block" method for TEM analysis?

a. "Windrows" of fibers
b. Increased tilting of fibers
c. Decreased transparency
d. Reduced fiber counts
14. The more an MCEF is etched, the easier it is for a TEM analyst
      to detect short/thin asbestos fibers. True or False?
True
False


Deadline for answers is October 31, 2007.

Answers will be available online at
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on November 12, 2007.

 
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