Assingments % - Understand the Objective You’re evaluating exposure to methyl n-amyl ketone in a workplace setting

You are asked to evaluate employees’ exposures to methyl n-amyl ketone during a painting operation using 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.). Centers for Disease Control and Prevention. http://www.cdc.gov/niosh/docs/2003-154/pdfs/2553.pdf
Please answer the following questions:
Your pre-sampling and post-sampling pump calibration using a primary standard are both 0.05 L/min. You collect a personal sample on an employee working in the operation. The sample is collected for 460 minutes. Calculate the sample volume.
The laboratory reports that the front section of the sample contains 4,500 µg of methyl n-amyl ketone and the back section contains 100 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 concentration of the sample 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.
You then reference OSHA’s Table Z-1 and find that the 8-hour TWA PEL for methyl n-amyl ketone is 100 ppm. 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 of the personal sample you collected compare to the OSHA PEL and 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.
Show all your work for the calculations for questions 1 and 2. Your answers for questions 3 and 4 should be at least 70 words in length. Cite the NIOSH document using APA Style.
calculations example link: https://youtu.be/xuWcexN5HhA

Struggling with where to start this assignment? Follow this guide to tackle your assignment easily!

Introduction

This assignment asks you to evaluate employees’ exposures to methyl n-amyl ketone during a painting operation using NIOSH Method 2553. Your task involves several calculations and comparisons of exposure levels with established standards. Here’s how you can break down the process step by step:

Step 1: Understand the Objective

You’re evaluating exposure to methyl n-amyl ketone in a workplace setting. Your main goal is to calculate the sample volume, determine the concentration of methyl n-amyl ketone in the air, convert it to different units (µg/L, mg/m³, and ppm), and compare the results with OSHA and ACGIH standards.

Step 2: Gather the Data

Start by reviewing the data provided:

Pre-sampling and post-sampling pump calibration: 0.05 L/min
Sample collection time: 460 minutes
Sample contents: 4,500 µg (front section) and 100 µg (back section)
No detectable methyl n-amyl ketone in the field blanks.

Make sure you have access to the full NIOSH Method 2553 for sampling procedures if you need it for further clarification.

Step 3: Calculate the Sample Volume

To calculate the sample volume, use the formula:

$(min)\text{Sample Volume (L)} = \text{Flow Rate (L/min)} \times \text{Sampling Time (min)}$

Given that the flow rate is 0.05 L/min and the sampling time is 460 minutes:

$L\text{Sample Volume} = 0.05 \, \text{L/min} \times 460 \, \text{min} = 23 \, \text{L}$

Step 4: Calculate the Concentration in µg/L

Next, calculate the total amount of methyl n-amyl ketone collected in the sample:

$section\text{Total Methyl n-amyl ketone} = \text{Front section} + \text{Back section}$ $μg\text{Total Methyl n-amyl ketone} = 4500 \, \mu g + 100 \, \mu g = 4600 \, \mu g$

Now, calculate the concentration in µg/L:

$(L)\text{Concentration (µg/L)} = \frac{\text{Total Methyl n-amyl ketone (µg)}}{\text{Sample Volume (L)}}$ $μg/L\text{Concentration (µg/L)} = \frac{4600 \, \mu g}{23 \, L} = 200 \, \mu g/L$

Step 5: Convert µg/L to mg/m³

To convert µg/L to mg/m³, use the following conversion factor based on the ideal gas constant:

$g/mol\text{Concentration (mg/m³)} = \text{Concentration (µg/L)} \times \frac{1 \, \text{mg}}{1000 \, \mu g} \times \frac{24.45 \, \text{L/mol}}{114.2 \, \text{g/mol}}$ $g/mol\text{Concentration (mg/m³)} = 200 \, \mu g/L \times \frac{1 \, \text{mg}}{1000 \, \mu g} \times \frac{24.45 \, \text{L/mol}}{114.2 \, \text{g/mol}}$ $mg/m³\text{Concentration (mg/m³)} = 0.428 \, \text{mg/m³}$

Step 6: Convert mg/m³ to ppm

To convert mg/m³ to ppm, use the formula:

$(MW)\text{Concentration (ppm)} = \frac{\text{Concentration (mg/m³)} \times 24.45}{\text{Molecular Weight (MW)}}$ $g/mol\text{Concentration (ppm)} = \frac{0.428 \, \text{mg/m³} \times 24.45}{114.2 \, \text{g/mol}}$ $ppm\text{Concentration (ppm)} = 0.090 \, \text{ppm}$

Step 7: Compare Results to OSHA and ACGIH Standards

The OSHA Table Z-1 8-hour TWA PEL for methyl n-amyl ketone is 100 ppm.
The ACGIH TLV for methyl n-amyl ketone is 50 ppm.

Your calculated concentration is 0.090 ppm, which is much lower than both the OSHA PEL and the ACGIH TLV. This indicates that the employee’s exposure is significantly below the recommended exposure limits.

Step 8: Recommend Which Standard to Compare Results To

When deciding which standard to use for comparison, consider the following:

OSHA PEL: This is a legal limit that must be adhered to by employers in the U.S.
ACGIH TLV: This is a guideline that reflects a recommended exposure level based on health research, but it is not legally enforceable.

Given that your result is much lower than both standards, it’s a good idea to reference the OSHA PEL in your report, as it’s the legally binding standard. However, if you’re considering more health-conscious practices, the ACGIH TLV could also be cited as a precautionary measure.

Step 9: Final Thoughts

Make sure you clearly explain your calculations and rationale in your paper. Stay consistent with your units and show all your steps for transparency. Provide a brief discussion at the end about whether you think the exposure levels are acceptable and any further actions you would recommend based on your findings.