National Institute for Occupational Safety and Health

Name: NIOSH Manual of Analytical Methods — Metalworking Fluids (MWF) All Categories (5524)
Author: National Institute for Occupational Safety and Health

NIOSH Manual of Analytical Methods… (1994)

Summary

“NIOSH Manual of Analytical Methods — Metalworking Fluids (MWF) All Categories (5524)”, published in 1994, is a work by National Institute for Occupational Safety and Health. It explores elements such as filter, solvent and samples.

Quotes from NIOSH Manual of Analytical Methods… (National Institute for Occupational Safety and Health)

National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ The possibility of mixed exposures always dictates that the extraction procedure with both the binary and ternary solvent blends should be followed. If the weights of samples exceed the amount expected to be collected at the REL, e.g., 0.4 mg (thoracic fraction) or 0.5 mg (‘total’ aerosol) for a 1 m3 air sample, then extract the samples and blanks as follows: a. Place each filter (membrane side up) in the filter funnel assembly connected to the vacuum source. b. Pour one 10-mL aliquot of the ternary solvent down the inside wall of the funnel over the filter. ”

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National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ The ‘total’ weight procedure permits an estimate of the ‘total’ collected particulate aerosol, including nuisance dust, airborne metal particulate and metal working fluid. If the extraction procedure is used, the technique permits an estimate of the ‘total’ collected metalworking fluid to which the worker is exposed. The development of the ternary solvent used in this method is described in reference 3. This method was initially tested with representative samples of straight, soluble, semi-synthetic, and synthetic metalworking fluids (MWFs) . ”

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Source: Wikisource

National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ For thoracic measurements, sample at 1.6 L/min for 8 hours. For ‘total’ aerosol measurements, sample at 2 L/min for 8 hours. Do not exceed a total filter loading of approximately 2 mg. 9.
Submit at least 5 blank filter samples as field blanks and 3 filters for media blanks for each set of samples collected per day. Handle the field blanks in the same way as the field samples; i.e., open each in a non-contaminated environment, then close the sampler and ship it to the lab along with the remaining samples. Media blanks are not opened. 10. ”

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National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ Place a plug in each opening of the filter cassette. Place a cellulose shrink band around the filter cassette and allow to dry. Alternatively, use heavy duty elastic tape instead of the shrink band. Mark with the same number as the backup pad. SAMPLING: Bulks:
For solubility testing, obtain liquid samples of pure uncut bulk metal-working fluids (MWF) that are expected to be sampled in worker breathing zone. Place these samples in small (e.g., 10 mL) leak-proof glass container (s) that are sealed with a leak-proof PTFE-lined screwcap. ”

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Source: Wikisource

National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ Mention of any company or product does not constitute endorsement by the National Institute for Occupational Safety and Health. In addition, citations to Web sites external to NIOSH do not constitute NIOSH endorsement of the sponsoring organizations or their programs or products. ”

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Source: Wikisource

National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ METHOD 5524, Issue 2, dated 29 December 2014 - Page 8 of 10
Appendix 1. Procedure to remove PTFE filter contaminants that are soluble in and extracted with the ternary blend. Use this procedure to prevent high blanks from being obtained following extraction of PTFE filters. The filters are rinsed with ternary solvent (1:1:1 dichloromethane:methanol:toluene) described in NMAM Method 5524. The filters are air-dried and protected from airborne contamination prior to weighing and assembly into cassettes for field sampling. See evaluation of procedure which follows these instructions. ”

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Source: Wikisource

National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)

“ Record the mean tare weight of sample filters, W1 and field blanks, B1 (mg) . 5.
Weighing procedure: a. Equilibrate the filters in an environmentally controlled weighing area or chamber for 1 hour (minimum.) b. Zero the balance before each weighing. Using forceps, pass each filter over a static neutralizer. Repeat this step if the filter does not release easily from the forceps or attracts the balance pan. (Static electricity can cause erroneous weight readings.) c. Weigh each filter until a constant weight is obtained (i.e., two successive weighings within 10 μg.) ”

National Institute for Occupational Safety and Health

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Quotes from NIOSH Manual of Analytical Methods… (National Institute for Occupational Safety and Health)

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