1,2,3 Trichloropropane (MW 147.4) is stored in a 55 gallon drum in a 200 ft X 150 ft x 20 ft warehouse (mixing factor 4). The saturated vapor of 1,2,3 Trichloropropanee (VP = 3 mmHg) leaks at a rate of 1 cubic feet per minute(cfm) from the drum. The warehouse is ventilated by a 1 ft diameter round duct operated at 2 " water gauge velocity pressure. An industrial hygienist collects an active sample, a passive sample and a direct reading from an instrument. Assume steady-state conditions. Assume NTP.

Use the information provided to determine:

a) the concentration in the room,

b) the concentration in each sample

c) the % error for each sampling method.

Need to know:

Ventilation rate Generation rate Room concentration Active sample concentration Passive sampler concentration Error calculations

Assume that the calculated concentration in the room is the expected value and the various sampling methods are the observed values for the error calculations.(Do not round keep at least 3 significant figures throughout calculations) The active sample was collected at a sample rate of 100 milliliters per minute for 2 hours. The analysis of the sample indicated that 0.252 mg were collected. The passive sample was exposed for 120 minutes. The final reading from the passive sampler was 7 ppm-hr. The direct reading instrument reads 19 mg/m3.