National Institute for Occupational Safety and Health

Name: NIOSH Manual of Analytical Methods — Non-Volatile Acids (Sulfuric Acid and Phosphoric Acid) (7908)
Author: National Institute for Occupational Safety and Health

NIOSH Manual of Analytical Methods… (1994)

Summary

“NIOSH Manual of Analytical Methods — Non-Volatile Acids (Sulfuric Acid and Phosphoric Acid) (7908)”, published in 1994, is a work by National Institute for Occupational Safety and Health. It explores elements such as sample, filter and phosphoric acid.

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)

“ All work should be performed with adequate ventilation for personnel and equipment. It is imperative that acid be added to water in order to avoid a violent exothermic reaction. There is risk of fire and explosion when phosphoric acid has contact with bases, combustible substances, oxidizing agents, reducing agents or water. Avoid physical contact since both sulfuric and phosphoric acid are both corrosive and irritants to eyes, skin, and the respiratory system. ”

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

“ Particulate salts of sulfate or phosphate will give a positive interference. OTHER METHODS: This procedure, which is consistent with ISO 21438-1 [6] , replaces NIOSH 7903 [8] for the determination of sulfuric and phosphoric acid in workplace air samples by IC. The main advantage of NIOSH method 7908 is that it can allow for the collection of the inhalable fraction of sulfuric and phosphoric acid aerosols by means of the pre-filter (housed within an optional inhalable sampler.) ”

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Source: Wikisource

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

“ V = volume, in mL, of the sample test solutions 1 Fd = dilution factor for each sample test solution Fc = conversion factor to convert from anion to acid concentration: Fc = 1.021 for sulfate; Fc = 1.031 for phosphate EVALUATION OF METHOD: Laboratory testing with generated atmospheres of sulfuric acid mist yielded a collection efficiency of greater than 95% over the range 0.5 to 10 mg/m3 of H2SO4 on 0.45 μm pore size PTFE filters [4] . Greater than 95% recovery of sulfuric acid and phosphoric acid was found four weeks after sample collection. ”

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Source: Wikisource

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

“ Through dilution of the calibration stock solution in eluent solution, prepare calibration working standard solutions covering the range of approximately 0.2 to 8 mg/L of sulfate and phosphate. Store working standards in tightly sealed polyethylene bottles. Prepare fresh working standards weekly. 12.
Calibrate the ion chromatograph with at least six working standards covering the range of 0.2 to 8 mg/L of sulfate and phosphate ion per sample by preparing a calibration graph of anion peak height (mm or μS [micro siemens] ) vs. ”

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Source: Wikisource

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

“ Analyze working standards together with samples, reagent blanks and field blanks at a frequency of at least 1 per 20 samples (3 minimum of each) . MEASUREMENT: 14.
Set the ion chromatograph to desired eluent flow rate, e.g.,1.5 mL/min, and column pressure, e.g., 1.1 x 105 kPa, and other conditions as specified by the instrument manufacturer. 15. ”

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Source: Wikisource

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

“ Breuer D, Heckmann P, Gusbeth K, Schwab G, Blaskowitz M, Moritz A [2012] . Sulfuric acid at workplaces – applicability of the new indicative occupational exposure limit value (IOELV) to thoracic particles. ”

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Source: Wikisource

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

“ Guide to the expression of uncertainty in measurement. Geneva, Switzerland: ISO. [6] ISO [2007] . ISO 21438-1: Workplace atmospheres – Determination of inorganic ions by ion chromatography – Part 1: Non-volatile acids (sulfuric acid and phosphoric acid) . Geneva, Switzerland: International Organization for Standardization (ISO) . [7] Breuer D [2013] . Anorganische säuren, partikulär: phosphorsäure, schwefelsäure (Inorganic acid mists: phosphoric acid, sulfuric acid) , in IFA Working Folder, Sheet No. ”

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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