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CHROMIUM, HEXAVALENT 7605 by Ion …
NIOSH Manual of Analytical Methods (NMAM), Fourth EditionCHROMIUM, HEXAVALENT7605by Ion ChromatographyCr(VI)MW: (Cr); (CrO3)CAS: 18540-29-9 RTECS: GB6262000 METHOD: 7605, Issue 1 EVALUATION: FULLI ssue 1: 15 March 2003 OSHA mg/m3 (as CrO3) mg/m3/10 h; mg/m3 (as Cr, soluble); some insolublechromates are human carcinogensPROPERTIES:oxidizing agentSYNONYMS: Vary depending upon the compound; chromate commonly used, chrome six. SAMPLINGMEASUREMENTSAMPLER:FILTER( :m PVC membrane)FLOW RATE:1 to 4 L/minVOL-MIN:1 L @ mg/m3 -MAX:400 LSHIPMENT:Routine. Can be shipped cold when :Stable for 2 weeks at room for 4 weeks if stored in :2 to 10 field blanks per setTECHNIQUE:Ion chromatography with post-columnderivatization and UV :CrO4-2-diphenylcarbazide (DPC) complexEXTRACTION:5 mL 2% NaOH- 3% Na2CO3. Dilute to25 mL after :100 :LCOLUMN:Dionex NG1 Guard, HPIC- AS7 Separator or equivalentMOBILE PHASE:250 mM (NH4)2SO4 /100 mM NH4 OHFLOW mL/min; mL/min post columnPOST- mM DPC + 10% MeOH +1N H2SO4 DETECTOR:540 nmCALIBRATION:Standard solutions of K2Cr2O7 inNaOH-Na2CO3 to 20 :g per sampleESTIMATED :g per sample [3]PRECISION ( r) @ to 5 :g/sample [3]ACCURACYRANGE to 120 :g Cr(VI) [1,2] [2]OVERALL PRECISION ( rT) : ( - 960 :g/m3) [1]APPLICABILITY: The working range is to mg/m3 for a 20
CHROMIUM, HEXAVALENT: Method 7605, Issue 1 dated 15 March 2003 - Page 3 of 5 NIOSH Manual of Analytical Methods (NMAM), Fourth Edition 3. Filters can be left in the cassettes for shipping to the lab, but to minimize sample contaminat ion during
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