Question 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 = Ca Ta + Cb Tb + + Ctn
| 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 |
| Cb | = | 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 PL?
| Selected Answer: | null Remove |
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