BOS 4301 Unit 4 Biological & Biomedical Sciences Case Study
Instructions:
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(dot)cdc(dot)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).
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.
Calculate the concentrations of the two personal samples in µg/L and mg/m³.
Convert the result to ppm (MW for methyl n-amyl ketone = 114.2). Note: Use the ideal gas constant of 24.45.
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
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.
Discuss how the results for the two personal samples compare to the ACGIH TLV.
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.
BOS 4301 UNIT 4
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BOS 4301 UNIT 4
NIOSH 2553 method for sampling involves the process of using a solid sorbent tube to ploy and hold the compounds of interest without altering their composition (NIOSH, 1996). The sampling method is commonly used to analyze contaminants in the air, blood, or urine of workers who have been exposed to their workplaces. The paper seeks to evaluate employee’s exposure to methyl n-amyl ketone during a painting operation.
The first section of the paper requires us to calculate the sample volumes of the given samples during the pre-sampling and post sampling. The collected personal samples for this section are as follows:
The pre-sampling and post-sampling pump calibrations using a primary standard are both 0.05L/Min
The sampling time for sample one = 430minutes
The sampling time for sample two = 440minutes
The formula for calculating the sample volume = Rate * Time
The volume of sample one = Rate*Time
= 0.05*430 = 21.5L
The volume of sample two = Rate*Time
= 0.05*440 = 22L
The second section of the paper requires us calculate the concentrations of the two personal samples in µg/L and mg/m³, and the convert the result to ppm (MW for methyl n-amyl ketone = 114.2). Hence, the calculations are as follows:
The amounts of the analyses at different locations of the sampler;
Sample one: Front Section = 5000 µg of methyl n-amyl ketone = Wf
Sample one: Back Section = 200 µg of methyl n-amyl ketone = Wb
Sample two: Front Section = 4000µg of methyl n-amyl ketone = Wf
Sample two: Back Section = 50µg of methyl n-amyl ketone =Wb
Blank: Front Section = 0 = Bf; Back Section = 0 = Bb
1. The formula of calculating the concentration = (Wf+Wb-Bf-Bb) / V =mg/m3
The concentration for sample one = (Wf+Wb-Bf-Bb) / V =mg/m3
=5000+200-0- 0/21.5=241.86mg/m3=241.86microgram/L
The concentration for sample two = (Wf+Wb-Bf-Bb) / V =mg/m3
=4000+50-0-0/22=184.09mg/m3=184.09microgram/L
2. The Conversion of the concentrations to ppm
The formula for converting the concentration in ppm = 24.45 (the ideal gas constant) *TLV in mg/m3/molecular weight
The calculations for sample one = 24.45* TLV in mg/m3/molecular weight
=24.45*241.86/114.2 =...
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