Transcription of SILICA, CRYSTALLINE, by XRD (filter redeposition) 7500
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SILICA, CRYSTALLINE, by XRD (filter redeposition) 7500
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition silica , CRYSTALLINE, by XRD (filter redeposition) 7500 SiO2 MW: CAS: 14808-60-7 (quartz) RTECS: VV7330000 (quartz) 14464-46-1 (cristobalite) VV7325000 (cristobalite) 15468-32-3 (tridymite) VV7335000 (tridymite)METHOD: 7500 , Issue 4 EVALUATION: FULLI ssue 1: 15 August 1990 Issue 4: 15 March 2003 OSHA :quartz (respirable) 10 mg/m3/(%SiO2+2);cristobalite and tridymite (respirable) the mg/m3; carcinogenACGIH:quartz (respirable) mg/m3cristobalite (respirable) mg/m3tridymite (respirable) mg/m3 PROPERTIES:solid; d g/cm3 @ 0 C; crystallinetransformations: quartz to tridymite@ 867 C; tridymite to cristobalite@ 1470 C; "-quartz to -quartz@ 573 CSYNONYMS:free crystalline silica ; silicon dioxideSAMPLINGMEASUREMENTSAMPLER:CYCLON E + FILTER(10-mm nylon cyclone, Higgins-Dewell (HD) cyclone, or aluminumcyclone + 5-:m PVC membrane)*see sampling sectionFLOW RATE:Nylon cyclone: L/min;HD cyclone: L/min;aluminum cyclone: L/minVOL-MIN:400 L -MAX:1000 LSHIPMENT:RoutineSAMPLE STABILITY:StableBLANKS:2 to 10 per set (see step )BULK SAMPLE:High-volume or settled dust; toidentify interferencesTECHNIQUE:X-RAY POWDER DIFFRACTION ANALYTE:Crystalline SiO2 ASH:Muffle furnace or RF plasma asher or dissolve in tetrahydrofuranREDEPOSIT:On :m Ag membrane filterXRD:Cu target
SILICA, CRYSTALLINE, by XRD: METHOD 7500, Issue 4, dated 1 5 March 2003 - Page 2 of 9 NIOSH Manual of Analytical Methods (NMAM), Fourth Edition REAGENTS: 1. Silica Standards. a. Quartz* (SRMs 1878a, 2950, 2951, 2958) and Cristobalite* (SRMs 1879a, 29 60, 2957), available from Standard Reference Materials Program, Rm . 204, Bldg. 202,
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