Assume the attached aerosol particle size distribution describes a workplace env

Question

Assume the attached aerosol particle size distribution describes a workplace environment.

a. [8] Quantitatively estimate the following. Mass Median Aerodynamic Diameter, Geometric Standard Deviation, Total Suspended Particulate Concentration, Respirable Particulate Concentration. Show all work. (Hint: Use the approximation that the particle size of the aerosol corresponding to each bar of data is the midpoint of its range. For example, use 6 micrometers for the size range 5-7 micrometers).

Explanation / Answer

Now total aerosol concentration from the graph=28 micro gram/m

Thus MMAD, defined as diameter dividing the aerosol particle size distribution in half diameter at which 50%of particles of mass are later & 50%are smaller

From the graph Mmad is 9 micro meters

Geometric standard deviation

Steps to follow:

1. Take average of concentration, which turns out to be 4

2. Calculate squared differences, subtract aerosol concentration at each diameter with 4 and then square it. Now we get 1,1,0,4,9,1,4

3. Average of this gives variance that is 2.85

4. Square root of variance gives geometric standard deviatio, such will be 1.68

1.68

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