You are asked to evaluate employeesâ exposures to methyl n-amyl ketone during a painting operation. After careful consideration, you choose NIOSH Method 2553 for the sampling. You can access the method by clicking the link below:
National Institute for Occupational Safety and Health. (2003). Ketones II: Method 2553. In P. M. Eiler & M. E. Cassinelli (Eds.), NIOSH manual of analytical methods (4th ed.). Retrieved from http://www.cdc.gov/niosh/docs/2003-154/pdfs/2553.pdf
Your pre-sampling and post-sampling pump calibrations using a primary standard are both 0.05 L/min. You collect personal samples on two employees working in the operation. The samples are collected for 430 minutes (Sample 1) and 440 minutes (Sample 2).
Calculate the sample volumes for each of the samples.
The laboratory reports that the front section of Sample 1 contains 5,000 µg of methyl n-amyl ketone and the back section contains 200 µg of methyl n-amyl ketone. The front section of Sample 2 contains 4,000 µg of methyl n-amyl ketone and the back section contains 50 µg of methyl n-amyl ketone. Neither the front nor back sections of the field blank you supplied contain any detectable levels of methyl n-amyl ketone.
Calculate the concentrations of the two personal samples in µg/L and mg/m³.
Convert the result to ppm (MW for methyl n-amyl ketone = 114.2). Note: Use the ideal gas constant of 24.45.
Show all the steps for your calculations.
You then reference OSHAâs Table Z-1 and find that the 8-hour TWA PEL for methyl n-amyl ketone is 100 ppm
Discuss how the results of the two personal samples you collected compare to the OSHA PEL, and describe the sampling method you implemented.
You also look up the ACGIH TLV for methyl n-amyl ketone and find that the TLV is 50 ppm as an 8-hour TWA exposure.
Discuss how the results for the two personal samples compare to the ACGIH TLV.
Discuss whether you would recommend comparing the results of your sampling to the OSHA PEL or the ACGIH TLV. Include your rationale for the choice, and explain how you would rationalize your choice to your employer.
Sample Solution
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ay allude the prior related overviews [47] [46] [48] [49] if vital. We intend to display the piece of the writing that is worried about delicate watermarking frameworks in simply enough detail that may give a thought of couple of the segments of the plan in the article being investigated and excite an enthusiasm to allude the real article. PROPERTIES OF FRAGILE WATERMARKING SCHEMES: Coming up next are barely any key properties expected of delicate watermarking plans. Alter location and localisation The plan ought to have the option to distinguish whether the picture is altered or not with high likelihood regardless of whether it is exceptionally unimportant alteration to the picture. It ought to likewise have the option to precisely restrict the Industrial Hygiene Unit IV Case Study altered areas. This straightforwardly contributes towards the nature of the recuperated picture in the event that the plan additionally has picture recuperation module. Perceptual straightforwardness This alludes to the comparability between the watermarked Industrial Hygiene Unit IV Case Study picture and the first picture. On the off chance that the enemy could distinguish the presence of the watermark, at that point the security of the picture is under danger. Despite the fact that not an ideal measurement, the PSNR is broadly utilized and acknowledged proportion of the perceptual straightforwardness. Computational expense The computational expense commonly estimated as far as execution time of the installing, discovery of watermark and localisation of the altered areas and recuperation of the tampe>
