Transcription of CHROMIUM, HEXAVALENT, 7703 by Field-Portable …
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CHROMIUM, HEXAVALENT, 7703 by Field-Portable …
NIOSH Manual of Analytical Methods (NMAM), Fourth EditionCHROMIUM, hexavalent , 7703 by Field-Portable SpectrophotometryCr[VI] MW: (Cr) (CrO3)CAS: 18540-29-9 RTECS: GB6262000 METHOD: 7703, Issue 1 EVALUATION: FULLI ssue 1: 15 March 2003 OSHA : C mg/m3 (as CrO3) mg/m3/10 h (carcinogen)ACGIH: mg/m3 (water-soluble compounds); mg/m3 (insoluble compounds)PROPERTIES:oxidizing agentSYNONYMS: vary depending on the compound; chromate commonly usedSAMPLINGMEASUREMENTSAMPLER:FILTER ( m PVC membrane [1,2]; m MCE or m PTFE acceptablefor field analysis [3]).FLOW RATE:1 to 4 L/minVOL-MIN:10 L (2 L/min for 5 min) -MAX:1200 L (2 L/min for 600 min)SHIPMENT:refrigerant pack at 4 2 oC (optional)SAMPLESTABILITY:analyze within 24 hours; if applicable,keep samples at 4 2 :One per twenty field samples, minimumof 2 per : Field-Portable VISIBLESPECTROPHOTOMETRYANALYTE:Cr[VI] - diphenylcarbazone complexEXTRACTION:10 mL M (NH4)2SO4 / M NH4OH (pH = 8 + ), ultrasonic extraction 30min Cr[VI]ISOLATION:Strong anion exchange solid phaseextraction M (NH4)2SO4 / M NH4 OHWAVELE
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition CHROMIUM, HEXAVALENT, 7703 by Field-Portable Spectrophotometry …
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