Determination of Chromium(III), Chromium(VI), and Chromium(III) acetylacetonate in water by ion-exchange disk extraction/metal furnace atomic absorption spectrometry

摘要: Abstract A new method for the separate determination of Chromium(III) (Cr(III)), Chromium(VI) (Cr(VI)), and Cr(III) acetylacetonate (Cr(acac) 3 ) in water was developed using a cation-exchange extraction disk (CED) an anion-exchange (AED) combined with metal furnace atomic absorption spectrometry (MFAAS). 100-mL sample adjusted to pH 5.6 passed through CED placed on AED. Cr(acac) were adsorbed CED, Cr(VI) The eluted 50 mL carbon tetrachloride, followed by elution 3 mol L − 1 nitric acid. chemical species Cr from tetrachloride identified as infrared spectroscopy. eluate diluted 100 mL those deionized water. All solutions subsequently analyzed MFAAS. calibration curve aqueous exhibited good linearity range 0.1 1 ng. detection limit Cr, which corresponded three times standard deviation ( n  = 10) blank values, 20 pg. recovery test Cr(III), Cr(VI), desirable results (96.0%–107%) when 5 μg each (50 μg L added samples (i.e., tap water, rainwater, bottled drinking water). In humic acid solution, quantitatively recovered (103%), but poor recoveries 84.8% 78.4%, respectively).