An ion chromatographic method for insoluble chromates in paint aerosol.
Am Ind Hyg Assoc J 1987 Oct; 80(10):830-835
An ion chromatographic method for determining insoluble chromates in paint aerosols was described. Paint samples were collected on polyvinyl-chloride filters, and the filters were extracted with hot aqueous sodium-hydroxide and sodium-carbonate in beakers covered with a watch glass and heated to 135 degrees-C on a hotplate for 1.5 hours. After cooling, each beaker and its filter were rinsed three or four times with distilled water. These washings were combined in a centrifuge tube, diluted with water, transferred to a syringe fitted with an in/line filter and injected into an ion chromatograph. Injection volume was 50 microliters. The ion chromatograph was calibrated with hexavalent-chromium (18540299) (Cr+6) reference solutions containing 0.2 to 10 micrograms per milliliter (microg/ml) Cr+6. The calibration curve of the chromatograph peak height versus Cr+6 concentration was linear with a calibration coefficient of 0.9998. The detection limit was estimated to be 0.1microg/ml Cr+6. The method was tested with simulated paint aerosols and the results were compared with the reference method, inductively coupled plasma atomic emission spectrometry (ICPAES). The percentage Cr+6 found by the ion chromatographic method ranged from 3.31 to 3.39 percent with a pooled relative standard deviation of 4.27 percent. The percentage Cr+6 found by ICPAES was 3.15 to 3.39 percent with a pooled relative standard deviation of 6.3 percent. The authors conclude that the method is suitable for monitoring occupational exposure to Cr+6 at both the American Conference of Governmental Industrial Hygienists standard of 0.05 milligrams per m3 (mg/m3) and the OSHA standard of of 0.1mg/m3.
NIOSH-Author; Analytical-methods; Metals; Chromium-compounds; Chromatographic-analysis; Standards; Occupational-exposure; Paints; Chemical-processing
Daniel Molina, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, OH 45226
American Industrial Hygiene Association Journal