Transcription of CHROMIUM, HEXAVALENT 7600
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CHROMIUM, HEXAVALENT 7600
CHROMIUM, HEXAVALENT 7600. Cr(VI) MW: (Cr); (CrO3) CAS: 18540-29-9 RTECS: GB6262000. METHOD: 7600, Issue 2 EVALUATION: FULL Issue 1: 15 May 1989. Issue 2: 15 August 1994. OSHA : mg/m 3 (as CrO 3) PROPERTIES: oxidizing agent NIOSH: mg/m 3/10 h; carcinogen ACGIH: mg/m 3 (as Cr, soluble); some insoluble chromates are human carcinogens SYNONYMS: vary depending upon the compound SAMPLING measurement . SAMPLER: FILTER TECHNIQUE: VISIBLE ABSORPTION. ( m PVC membrane) SPECTROPHOTOMETRY. FLOW RATE: 1 to 4 L/min ANALYTE: CrO 42--diphenylcarbazide complex VOL-MIN: 8 L @ mg/m 3.
MEASUREMENT: 9. Set wavelength on the spectrophotometer to 540 nm. 10. Set to zero using a 0.5 N H 2SO 4 reagent blank. 11. Transfer sample solution to a cuvette and record the absorbance. NOTE 1: A sample containing 1.5 µg Cr(VI)/25 mL gives ca. 0.2 absorbance. NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
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