Calculating the time weighted average

Reference no: EM13111666

An industrial hygiene survey has been conducted to determine whether exposure of workers to ethyl benzene (molecular weight 106) exceeded the OSHA PEL of 100 ppm. The exposure time and levels are:

Period of Time Average Hourly Exposure
8:00-10:00 am 90 ppm
10:00-12:00 pm 80 ppm
12:30-3:30 pm 110 ppm
3:30-4:30 pm 105 ppm

A. Calculate the 8 hr Time weighted Average (TWA). Show how

B. Was the OSHA PEL exceeded

Reference no: EM13111666

Questions Cloud

Hypothesis test for the mean-dietitian : A dietitian investigated whether apples washed in hot water or in cold water turned brown at different rates when exposed to air. She took 13 random apples and cut each in half.

Explain the role of pyruvate and adp : Why is oxygen not consumed in the presence of ADP alone, but the opposite results with the addition of pyruvate? In your answer, explain the role of pyruvate and ADP during oxidative phosphorylation.

Write progress report about own professional accomplishments : Write a progress report about your own professional or work accomplishments. The period to be covered is last month - Assignment is to accompany Lesson 8026 Project and Progress Reports

What is the density of the original undiluted culture : you count 13 bacterial cells in the smallest square of a hemocytometer culture was diluted 1:5 prior to placing a sample on the hemocytometer. what is the density of the original undiluted culture?

Calculating the time weighted average : An industrial hygiene survey has been conducted to determine whether exposure of workers to ethyl benzene (molecular weight 106) exceeded the OSHA PEL of 100 ppm.

Why might a brightly colored dewlap on an anolis lizard : Why might a brightly colored dewlap on an Anolis lizard be a reliable signal of male quality?

Proposals for dealing with hazardous waste : Reduce the production of hazardous waste and encourage recycling and reuse of hazardous materials by charging producers a tax or fee for each unit of waste generated.

Discuss this concept using the phantom limb phenomenon : Our perceptions of the external world are created by our brains. Discuss this concept using the phantom limb phenomenon to support your argument.

What body systems would use diffusion or osmosis : how is diffusion important to ATP production? what body systems would use diffusion or osmosis?

User Account

All Pages