What is the calculated TWA? What would you tell plant management in terms of exposure to acetone and compliance with the PEL?

Question 1

  1. You are an industrial hygienist conducting personal sampling on a worker who is overseeing a production process involving use of acetone (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 1000 parts per million (ppm) of acetone). You are able to measure the following exposures:

    700 ppm for 3 hours

    1300 ppm for 2 hours

    900 ppm for 3 hours

    What is the calculated TWA? What would you tell plant management in terms of exposure to acetone and compliance with the PEL?

    1. Attach File

50 points

Question 2

  1. Please solve the following problem, indicating your response on a Word document and submitting the document via File Upload.

    Using the following formula, solve the problem below, and show your work.

    TWA = CaTa + CbTb + … + CnTn

    8

    TWA = Time-Weighted Average
    Ca = Concentration of contaminant during the sampling period “a
    Ta = Time of sampling period “a
    Cb = Concentration of contaminant during the sampling period “b”
    Tb = Time of sampling period “b
    Cn = Concentration of contaminant during the sampling period “n“, where “n” is the last of a series of contaminants
    Tn = Time of sampling period “n

    Note: All concentrations are in parts contaminant per million parts of air or milligrams of contaminant per cubic meter of air.

    Air Sampling Problem: You are an industrial hygienist that is conducting personal sampling on a worker who is overseeing a production process involving use of toluene (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 200 parts per million (ppm)). You are able to measure the following exposures:

    500 ppm for 1 hour

    100 ppm for 4 hours

    225 ppm for 3 hours

    What is the calculated TWA? What would you tell plant management in terms of exposure to toluene and compliance with the PEL?

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