Lab report of Sample dust to be comply with OSHA (environment)

Lab data

Fall 2016

Metler Scale

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

In compliance.

https://www.osha.gov/dts/chemicalsampling/data/CH_259640.html