National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Formaldehyde gas is an interference. Concentrations of THPC can be corrected for formaldehyde gas by sampling for formaldehyde gas with NMAM 2016 [2] . Ozone has been observed to consume DNPH and to degrade the DNPH derivative of formaldehyde [3] . However, use of an ozone scrubber is not recommended because this scrubber may trap THPC aerosol. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ The average of the four average yields of formaldehyde was 100 .3% . The upper limit for collection of THPC on a filter is calculated at 1 mg. Since at 100% yield one mole of THPC releases one m ole of formaldehyde in the presence of DNPH and heat, 1 mg of THPC would release 158 μg of form aldehyde, a quantity w hich theoretica lly would react with 1.04 mg of DNPH. One DNPH -coated filter contains 2 mg of DNPH , a quantity which allows for the presence of excess DNPH when 1 m g of THPC is collected. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ The liver is a target organ. DNPH is a suspect carcinogen and is light sensitive [7] . Acetonitrile is toxic and is a fire hazard (flash point = 12.8 oC) . SAMPLING: 1. Ca librate each personal sampling pump with a repres en tativ e sampler in line at the desired sampling rate. 2. Rem ove inlet cassette piece from sampler for open-faced sampling. Rem ove cap from outlet of sam pler. Open-faced sampling is recomm ended because excessive quantities of THPC will exha ust the qu antity of DNPH in a small area of the filter during closed-face sampling. 3. ”
