Colorado State University Calculations for Occupational Health And Safety Problems

Question Description

1.You are going to sample acetone exposure in a nail salon in the local mall. You have chosen to sample over a typical 8-hour day as the basis of your TWA to assess exposure. (10 points)

Your conditions are 760 Torr and 298 K.

Your pump flow rate for an active sampler is 0.2 L/min and your sample volume is 3 L for each sample taken.

Your LOD as reported by the lab is 0.02 mg of acetone per sample taken.

The sampling results reported below are all adjusted for any acetone that was found on your submitted field blanks — meaning the acetone as found on the field blanks has been subtracted from the amount reported on each of the sample results from your laboratory.

The sampling results given below HAVE NOT been adjusted for the desorption efficiency of the method which is reported by the laboratory at 0.86.

The following data are mg of acetone per sample taken adjusted for the field blanks: 0.01, 0.018, 0.016, 0.019, 4.7, 9.1, 9.1, 9.1, 4.7, 6.9, 6.9, 9.1, 4.7, 6.9, 4.7, 6.9

(a)Construct/show the equation you use to get your TWA

(b)Express your TWA in mg/M3 and ppm at point at sampling conditions

(c)Explain if you feel your TWA is representative of the day

(d)If this worker was exposed to methyl ethyl ketone and cyclohexanone, could you apply the Additive Mixture Formula? Why?

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