TOXICOLOGICAL PROFILE FOR CHROMIUM - Davidborowski.com

Sample matrixAtomosphericdeposition (snow);determination insoluble(chromium(VI))and particulate(chromium(III))partDrinking water,surface water,and certaindomestic andindustrial effluents(dissolvedchromium(VI))Drinking water,groundwater andwater effluents(chromium(VI))Waste water andindustrial effluentfor chromium(VI)onlyTable 6-2. Analytical Methods for Determining Chromium in Environmental Samples (continued)Preparation methodThe melted snow filteredthrough Nucleopore filter; thefiltrate acidified with HNO 3 ;and dried by freeze-drier;residue dissolved in HNO 3 ;this preconcentrated solutionplaced in plastic tubes; bothplastic tube and Nucleporefilter irradiated with protonsEither the above Nucleoporefilter or the preconcentratedliquid placed in plastic vial isirradiated by thermal neutronComplex chromium(VI) inwater with APDC at pH 2.4and extracted with MIBKBuffer solution introducedinto ion chrom. Derivitizedwith dipenylcarbazideBuffered sample mixed withAlCl 3 and the precipitateseparated by centrifugationor filtrationAnalyticalmethodPIXEINAASample detectionlimit Percent recovery Reference2 µg/L (solubleportion)26 µg/L (snowparticle)5 µg/L (solubleportion)115 µg/g (snowparticle)No data Jervis et al. 1983;Landsberger et al. 1983No data Jervis et al. 1983;Landsberger et al. 1983Furnace AAS 2.3 µg/L No data EPA 1983(Method 218.5)Ion chromatographyspectrophotometry at530 mm0.3 µg/L 100% at 100 µg/L EPA 1996a(Method 7199)DPPA at pH 10–12 30 µg/L 90% at 0.2 mg/L Harzdorf and Janser1984CHROMIUM 3222. HEALTH EFFECTS