Determine the 8hr TWA worker exposure if the worker is exposed to toulene vapours as follows:duration of exposure are 3,3,4 and measured concentration are 100,250,90 respectively.TLV for toulene is 100ppm.is the worker overexposed ?

By sudipraj on

the following shows simple method to solve this question

Determine the 8hr TWA worker exposure if the worker is exposed to toulene vapours as follows: duration of exposure:3,3,4 and measured concentration:100,250,90 respectively TLV for toulene is 100ppm.is the worker overexposed ?

given:

Duration of Exposure(hr)Measured Concentration(ppm)
3100
3250
490

we can use the equation

$$\frac{C_1T_1+C_2T_2+C_3T_3}{T_1+T_2+T_3}$$

on putting the values we get

$$\frac{100\ast3+250\ast3+90\ast4}{3+3+4}$$

=141