Transcription of SILICA, CRYSTALLINE by IR 7602 - M. D. Campbell
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SILICA, CRYSTALLINE by IR 7602 - M. D. Campbell
silica , CRYSTALLINE by IR 7602 SiO2 MW: CAS:14808-60-7 ( quartz ) RTECS:VV7330000 ( quartz )14464-46-1 (cristobalite)VV7325000 (cristobalite)15468-32-3 (tridymite)VV335000 (tridymite)METHOD: 7602, Issue 2 EVALUATION:Issue 1: 15 February 1984 Issue 2: 15 August 1994 OSHA : quartz (respirable): 10 mg/m3/(% SiO2 + 2);cristobalite and tridymite (respirable): 1/2 the mg/m3; carcinogensACGIH: quartz (respirable) mg/m3cristobalite (respirable) mg/m3tridymite (respirable) mg/m3 PROPERTIES:solid; CRYSTALLINE transformations: quartz to tridymite @ 867 C; tridymite tocristobalite @ 1470 C; - quartz to - quartz @ 573 CSYNONYMS:free CRYSTALLINE silica ; silicon dioxideSAMPLINGSAMPLER:CYCLONE + FILTER(10-mm nylon, or Higgins-Dewell (HD) + m or 5- m PVC or MCE membrane)FLOW RATE:nylon L/minHD l/minVOL-MIN:400 L -MAX:800 LSHIPMENT:routineSAMPLE STABILITY:stableBLANKS:2 to 10 field blanks per setBULK SAMPLE:required; area respirable or settled dustMEASUREMENTTECHNIQUE:INFRARED ABSORPTIONSPECTROPHOTOMETRYANALYTE:quart zASH:muffle furnace or RF plasma asherPELLET:mix residue with KBr; press 13 mmpelletIR:scan absorbance from 1000 to 600 cm-1 CALIBRATION: quartz diluted in KBrRANGE:10 to 160 g quartzESTIMATED LOD:5 g quartzPRECISION (S r): < @ 30 g quartz per sample,in coal dust [1]ACCURACYRANG
SILICA, CRYSTALLINE by IR: METHOD 7602, Issue 2, dated 15 August 1994 - Page 2 of 5 REAGENTS: 1. Quartz* (NIST SRMs # 1878 and …
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