National Institute for Occupational Safety and Health

Name: NIOSH Manual of Analytical Methods — Quartz in Coal Mine Dust, by IR (Redeposition) (7603)
Author: National Institute for Occupational Safety and Health

NIOSH Manual of Analytical Methods… (1994)

Summary

“NIOSH Manual of Analytical Methods — Quartz in Coal Mine Dust, by IR (Redeposition) (7603)”, published in 1994, is a work by National Institute for Occupational Safety and Health. It explores elements such as filter, propanol and sample.

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)

“ If possible, generate the correction curve data on the same day that coal mine dust samples are analyzed since curve param eters may vary somewhat from day to day. A curve through the points should be linear but will not pass through the origin since the peak at 915 cm ! 1 is more intense than the peak at 800 cm ! 1 and sm all am oun ts of kaolinite do not interfere with the quartz analysis. NOTE 1: Ka olinite correctio n calibration curve is required when s am ples are ashed in an LTA since kaolinite is not destroyed under these circum stances a nd has a s interfering peak at 800 cm ! ”

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Source: Wikisource

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

“ Insert the sample into the beam of the spectrophotometer. Place the other half of the DM-450 filter on another holder, secure with a magnet and insert it into the reference beam. NOTE: For the best precision, the referenc e filter should be half of the same DM -450 filter which contains the redeposit. However, for routine analysis, the same 2-propanol-treated blank can be used for all filters with the sam e lot numb er. Run an infrared scan, in linear absorbance mode from 1000 to 650 cm ! 1. Draw an app ropriate baseline under the absorbance band at 800 cm ! 1 from ca. 820 to 670 cm ! 1. ”

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Source: Wikisource

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

“ Accuracy depends on obtaining uniform deposition of samples and standards across the filter surface and obtaining re prod ucible aliquo ts from the quartz s usp ens ion. This requires som e skill. The quartz calibration curve should be prepared before analyzing samples as a check on the analyst's ability to prepare uniform deposits. Repeatability should be <10% on re plicate standard s with m ore than 4 0 μg qua rtz. Perform an IR scan for each standard filter using the other half of the filter in the reference beam (steps 10 through 12) . ”

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Source: Wikisource

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

“ W hen the depth of liqu id in the funnel reaches ca. 4 cm above the filter, gently rinse the inside of funnel with 2-propanol and com plete filtration . Rem ove the clam p and lift off the fu nnel, taking care not to d istu rb and deposit. Release the vacuum . Define the deposit area by marking around the circumference using a pencil or scriber. This is especially important for standards or lightcolored sam ples. P lace the D M-450 filter ha lves in petri dishes and allow to air-dry. ”

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Source: Wikisource

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

“ NIST SRM 2950 calibration set ("-quartz) may be useful for preparing working standards at known concentrations. a. Place the flask containing the calibration stock solution in an ultrasonic bath for 30 to 45 min. b. Move the flask to a magnetic stirrer and stir slowly while the flask cools to room tem perature. Continue to stir slowly while preparing standards. c. Mount a DM-450 filter in the filtration apparatus in the same m anner used to redeposit the samples. Add 5 m L 2-propanol to th e fu nnel. W ithdraw an aliquot of the quartz suspension from the cente r of the flask . ”

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Source: Wikisource

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

“ Avoid inhaling quartz dust [6] . 2-Propanol is flam m able. H ydrochloric acid is corrosive and should be handled in a fume hood. SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Preweigh each filter to the nearest 0.01 mg. 3. Sa m ple at 1.7 ± 5% L/min with nylon cyclone or 2.2 ± 5% L/m in with HD cyclone fo r a tota l sam ple volum e of 300 to 1000 L. Do not exce ed 2 m g dust loading on the filter. NOT E 1: Do not allow the sampler assembly to be inverted at any time whe n using a cyclone. ”

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Source: Wikisource

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

“ Althoug h m ost analytical chem ists are fam iliar with the IR tec hnique a s ap plied to organic analyses, mineralogical samples require additional knowledge of g eology and m ineralogy to correctly interpret c rystal structu re, m atrix interfe renc es a nd m ineral transform ation for the laboratory client. ”

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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