Transcription of NMAM 7908: NON-VOLATILE ACIDS(Sulfuric acid and …
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NIOSH Manual of Analytical Methods (NMAM), Fifth Edition NON-VOLATILE ACIDS ( sulfuric Acid and Phosphoric Acid) 7908 Formulae: H2SO4 MW: CAS: 7664-93-9 RTECS: WS5600000 H3PO4 MW: CAS: 7664-38-2 RTECS: TB6300000 METHOD: 7908, Issue 1 EVALUATION: FULL Issue 1: 10 May OELsOSHA : 1 mg/m3 (H2SO4 & H3PO4)NIOSH: 1 mg/m3 (H2SO4 STEL: 3 mg/m3 (H3PO4)OtherOELs: [1,2]PROPERTIES:H24 C (98%); 330 C (100%); VP = < kPa @ 20 CH3PO4: Solid (often used in an aqueous solution), mp = C; bp = 158 C; vp = kPa @ 20 CSO: Liquid, mp = C (98%); 10 C (100%); bp = 338 SYNONYMS: H2SO4: hydrogen sulfate, oil of vitriol; H3PO4: ortho-phosphoric acidSAMPLINGSAMPLER: FILTER, 37-mm diameter quartz fib)
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/m 3 of H 2 SO 4 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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