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1 Scope and ApphcatlOn \ 1 1 ThIS method covers the determmatlOn of dIssolved hexavalent chromIUm m dnnkmg, surface and salme waters The method may also be apphcable to certam domestIc and mdustnalwastesafterfiltratIonprOVIdedthatnomterfernngsubstancesarepresent (See 41) 2 1 22 23 ThIs method IS based on the chelatlOn of hexavalent chromIUm wIth ammOnIum pyrrolIdme dithlOcarbamate (APDC) and extractlOn wIth methyl Isobutyl ketone (MIBK) The extract IS aspIrated mto the flame of the atomIC absorptIon spectrophotometer Hexavalent chromIUm may also be chelated wIth pyrrolIdme dithtocarbamic aCId m chloroform as descnbed m sectIOn 9 2 ofthe atomIC absorptIon text found m thIS manual A pH of2 3 must be mamtamed throughout the extractIOn Thediphenylcarbazidecolonmetncprocedureasfoundonp 192of"StandardMethods for the ExammatlOn ofWater and Wastewater", 14th edItIon, 1975, may also be used CHROMIUM, HEXAVALENT Method 218.4 (Atomic Absorption, chelation-extraction) 12 2 Summary ofthe Method The method may be used to analyze samples contammgfrom 10 to 250 ugof chromIum perhter 3 Sample Handhng and PreservatIOn 3 1 StabIlIty of hexavalent chromIUm IS not completely understood at thIS tIme Therefore, the chelatIon and extractIon should be carned out as soon as pOSSIble 32 To retard the chemIcal actIVIty of hexavalent chromIUm, the sample should be transported and stored untIl tIme ofanlysis at 4°C 4 Interferences 41 HIgh concentratIons of other reactIve metals, as may be found m wastewaters, may mterfere The method IS free from mterferences from elements normally occurnng m fresh water 5 Instrumental Pat;ameters (General) 51 ChromIUm hollow cathode lamp 52 Wavelength 3579 nm 53 Fuel Acetylene 54 OXIdant A I r 55 Type of Flame Fuel nch (adjust for orgamc solvent) 6 Reagents 6 1 AmmOnIum pyrrolIdme dlthIOcarbamate (APDC) solutIOn demmeralIzed water and dIlute to 100 ml Prepare fresh dally DIssolve 1 0 9 APDC m Approved for NPDES Issued 1978 2184-1 STORET NO. 01032PDF Image | Methods for Chemical Analysis of Water and Wastes
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