National Institute for Occupational Safety and Health

Name: NIOSH Manual of Analytical Methods — Formaldehyde (2016)
Author: National Institute for Occupational Safety and Health

NIOSH Manual of Analytical Methods… (1994)

Summary

“NIOSH Manual of Analytical Methods — Formaldehyde (2016)”, published in 1994, is a work by National Institute for Occupational Safety and Health. It explores elements such as formaldehyde, sampler and Supelco.

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)

“ Supelco samplers were fortified with known quantities of free formaldehyde in water, and ca libration was performed with me dia standards prepared from Supelco samplers fortified with known quantities of free formaldehyde in water; average recoveries ranged from 96.3% to 99.3% for five levels at 1.00 to 20 :g of formaldehyde per sampler (pooled S r = 0.0316; n = 6 at each level) . In a storage study, six Supelco samplers were fortified with 4-μg quantities of free formaldehyde in water. ”

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Source: Wikisource

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

“ Standard solutions of formaldehyde-DNPH at 0.10 and 1.0 μg/mL (formaldehyde equivalent concentrations) were stored in airtight vials at 5 °C in the dark and were analyzed periodically. The standard so lutions we re found to be sta ble (with no dete cta ble loss) for at least 10 week s and at least 12 week s, respectively. It is suggested that the reader see the Back up Da ta Report for a com parison of m edia stan dards with liquid standards for calibration [1] . Air sampling for a 24-hour period can be performed with a single Supelco sampler. ”

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Source: Wikisource

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

“ All calibration standards used at W aters Corporation were liquid standard solutions of form aldehyde-DN PH deriva tive in ac eton itrile [2,14] . The capacity of DNPH -coated silica gel samplers was found to vary with relative hum idity (RH ) in add ition to concentration of formaldehyde. At a formaldehyde concentration of 1.2 m g/m 3 and at 5% breakthrough, the W aters sampler had a capacity at <10% RH of 55 μg, and at >85% RH a capac ity of 77 μg. At 2.4 m g/m 3 and <10% RH , the 5% breakthrough capacity of the W aters sampler was 59 μg of form aldehyde. ”

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Source: Wikisource

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

“ Place the tip of the syringe needle against the frit in the inlet of the sampler and eject the formaldehyde solution. e. Prepare the m edia working stand ard (steps 7.a and 7.b) . f. Prepare a dditional working standards (steps 8.b. through 8.e.) . g. Trans fer 3-m L aliquots of working standa rds to 4-m L vials, and analyze (steps 10, 12 an d 13) . h. Prepare calibration graph, peak area or height vs. μg formaldehyde per sample. 9. Fortify and analyze three quality control spikes and three analyst spikes to ensure that calibration graph is in control. ”

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Source: Wikisource

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

“ Collect effluent from each sampler in a 10-mL volumetric flask. b. Add ac eton itrile to the m ark for ea ch s am pler. NOTE: The silica gel bed of the sampler will retain approximately 0.5 mL of the original 10 mL.
CALIBRATION AND QUALITY CONTRO L: 8. Ca librate daily with at leas t six m edia working standard s over the rang e of interes t. a. Prepare a series of aqueou s form aldehyde solutions for the fortification of samplers. Suggested concentrations include 1, 4, and 20 μg/mL. See APPEND IX A for standardization of formaldehyde in water. b. ”

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Source: Wikisource

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

“ Me asu re pe ak area or pe ak heigh t. NOT E 1: If sample peak is larger than the largest standard peak, dilute an aliquot of the rem ain ing sample solution, reanalyze, and apply appropriate dilution factor in the calculations. ”

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Source: Wikisource

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

“ Pressure drop across sampler should be less than 28 inches of water (7 kP a) at 1.5 L/min. Sam plers are comm ercially available, [Supelco S10 LpDN PH c artridge, cat. No. 2-101 4; W aters Corp. Sep -Pak X PoSu re Aldehyde Sam pler, part No.W ATO 47205; see APPEND IX B for SKC sam pler] . 2. Pe rsonal sam pling pum p, 0.03 to 1.5 L/m in with flexible connecting tubing. 3. Vials, 4-mL, glass with PTFE-lined rubber septa caps. 4. Vials, 20-mL, glass. NOTE: Do not use vials with “polycone” liners (sources of high formaldehyde blanks) [5,9] . 5. ”

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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