Industrial Hygiene Sampling Practices and Techniques
Lab
Assignment:
Each student is responsible for collecting a particulate 8-hour sample using NIOSH Analytical Method 0600. This sample may be collected as a personal or area sample.
Equipment needed:
• 1 air sampling pump and sampling train calibrated to an adequate flow rate
• 2 cassettes loaded with pre-weighed PVC filters and back-up pads (1 for sampling and 1 for a field blank)
• Cyclone
• Mettler Scale
Submission:
Must contain the following information:
• Objective
• Methodology
• Data
• Calculations to determine concentrations
• Conclusions
• Recommendations
Procedure:
Students shall weigh 10 PVC filters and record the post weight of each filter. The student shall then use the following data to identify the TWA for Employee A and Employee B.
|
Trial
|
Pre Sample reading
|
Post reading
|
|
1
|
2.5071
|
2.4675
|
|
2
|
2.5082
|
2.4842
|
|
3
|
2.5036
|
2.4847
|
|
4
|
2.5036
|
2.4846
|
|
5
|
2.5048
|
2.4974
|
|
6
|
2.5026
|
2.4908
|
|
7
|
2.5001
|
2.4846
|
|
8
|
2.5119
|
2.4829
|
|
9
|
2.5114
|
2.4780
|
|
10
|
2.5071
|
2.4816
|
Employee A
Sampling pump calibration data:
Pre-Calibration - 2.5052 liters per minute
Post Calibration - 2.4638 liters per minute
Average calibration is (2.5052 L+2.4638 L)/2=2.4845 L → 2.45/1000=.00248 m3
|
Pre-Weight
|
Sampling Time
|
Post weight
|
Volume
|
|
13.12 mg
|
480 min
|
15.91 mg
|
0.00248*480=1.19 m3
|
|
Blank X 13.39 mg
|
|
14.52 mg
|
|
• (15.91 mg-13.12 mg) - (14.52 mg-13.39)/1.19 m3 = 1.39 mg/m3
TWA= (1.39 mg/m3*(480)/480=1.39 mg/m3