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The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at...

The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time average over 40 hr). The CCl4 found in a sample is 4800 ppb. Does the sample meet the NIOSH standard? INCLUDE THE PROCEDURE

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Expert Solution

PPM = parts per million,

PPM is used to denote a ver low concentration of a solution.

One gram in 1000 ml is 1000 ppm

so therefore 10^-3 gram in 1000 ml is 1 ppm------(1)

1 LITRE=10^-3 m^3
so 1m^3= 10^3LITRE=1000LITRE-----(A)
And 1LITRE=1000ml
so 1000 LITRE=10^6 ml ----(B)
and from----(A) and (B) ,1m^3=10^6 ml

1m^3=10^6 ml=1000*10^3 ml-----(2)

from ---(1),

and from B;

-------(2)

so 12.6 mg/m^3 =

=>

=>

=>

=>0.0126 ppm (since, )

so from above calculation, 12.6 mg/m^3 of air=0.0126 ppm.------(C)

now the concentration of CCl4 found in a sample is 4800 ppb.

we know that,1 ppb=10^-3 ppm

so 4800 ppb=4800*10^-3ppm

4800 ppb=4.8 ppm

therefore,the concentration of CCl4 found in a sample is 4.8ppm-------(D)

From (C) -----12.6 mg/m^3 of air=0.0126 ppm.------(C)

Therefore,

The National Institute for Occupational Safety and Health (NIOSH) standards for CCl4 in air i.e. 0.0126 ppm is less than the CCl4 concentration found int the sample i.e.4.8ppm .

Therefore, the sample does not meet the NIOSH standard.

#HOPE THIS WILL HELP YOU...

#THANK YOU!!!!!!


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