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Bookmark Show all steps ON 9, Problem 36ESQ Problem Consider the following concentrations of air contaminants observed together on the same day TWA (ppm) Contaminant Isopropyl ether 200 Ethyl benzene Chlorobenzene Chlorobromomethane 50 Taken separately do any of the concentrations exceed the PEL for that substance?the AL Taken as a whole, does the mixture exceed the PEL? the AL?
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Answer #1

iso propyl ether 200 500 250

ethyl benzene 40 100 50

chlorobenzene 25 75 37.5

chlorobromomethane 50 200 100

considered and none of the contaminants are exceed of their PEL's or AL's

so here

the formula can be used for mixtures

Em = ( 200 / 500 ) + ( 40 /100 ) + ( 25 / 75 ) + ( 50 / 200 )

Em = 0.4 + 0.4 + 0.33 + 0.25

so 1.38 > 1 and also 1.38 > 0.5

so the both concentrations are exceed PEL or AL.

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