In: Other
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
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!!!!!!