Unit IV Case Study
You are asked to evaluate employees’ exposures to methyl
n-amyl ketone during a painting operation. After careful consideration, you
choose NIOSH Method 2553 for the sampling. You can access the method by
clicking the link below:
National Institute for Occupational Safety and Health.
(2003). Ketones II: Method 2553. In P. M. Eiler & M. E. Cassinelli (Eds.),
NIOSH manual of analytical methods (4th ed.). Retrieved from
http://www.cdc.gov/niosh/docs/2003-154/pdfs/2553.pdf
Your pre-sampling and post-sampling pump calibrations using
a primary standard are both 0.05 L/min. You collect personal samples on two
employees working in the operation. The samples are collected for 430 minutes
(Sample 1) and 440 minutes (Sample 2).
1. Calculate the sample volumes for each of the samples.
The laboratory reports that the front section of Sample 1
contains 5,000 µg of methyl n-amyl ketone and the back section contains 200 µg
of methyl n-amyl ketone. The front section of Sample 2 contains 4,000 µg of
methyl n-amyl ketone and the back section contains 50 µg of methyl n-amyl
ketone. Neither the front nor back sections of the field blank you supplied
contain any detectable levels of methyl n-amyl ketone.
1. Calculate the
concentrations of the two personal samples in µg/L and mg/m³.
2. Convert the result
to ppm (MW for methyl n-amyl ketone = 114.2).
3. Show all the steps
for your calculations.
You then reference OSHA’s Table Z-1 and find that the 8-hour
TWA PEL for methyl n-amyl ketone is 100 ppm
1. Discuss how the
results of the two personal samples you collected compare to the OSHA PEL, and
describe the sampling method you implemented.
You also look up the ACGIH TLV for methyl n-amyl ketone and
find that the TLV is 50 ppm as an 8-hour TWA exposure.
1. Discuss how the
results for the two personal samples compare to the ACGIH TLV.
2. Discuss whether
you would recommend comparing the results of your sampling to the OSHA PEL or
the ACGIH TLV. Include your rationale for the choice, and explain how you would
rationalize your choice to your employer.
The case study should be a minimum of three pages in length,
and you should cite the NIOSH document using APA style.
Information about accessing the grading rubric for this
assignment is provided below.
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