engleski

Determination of chromium(III), chromium(VI), manganese(II) and manganese(VIII) by EDXRF method

A rapid, sensitive and selective procedure for determination of Cr(III), Cr(VI), Mn(II) and Mn(VII) in environmental and industrial liquid samples via preconcentration with ammonium pyrrolidinedithiocarbamate (APDC) and diethylenetriaminepentaacetic acid (DTPA) was described. All targets were analyzed with energy dispersive X-ray fluorescence (EDXRF) spectrometer with 109Cd radioactive source. The effect of pH in the range of 3-11 and influence of organic meter, carbonate and metal ions on the recovery of Cr(III), Cr(VI), Mn(II) and Mn(VII) has been investigated separately and in combination. The maximum recovery of Cr(VI) was obtained at pH 4. The complexation with APDC was irregular in the pH range 5-9 while at pH 10 and 11 no complex formation occurred at all. The maximum recovery of Cr(III) was obtained exactly at pH 10 (98%), for Mn(II) was obtained at pH 10 while maximum recovery of Mn(VII) was obtained at pH 8 (97, 5%). Also, same method was used to investigate preconcentration of manganese and chromium species with DTPA. Results for the recoveries are lower then for APDC method. All created complexes of Cr(III), Cr(VI), Mn(II) and Mn(VIII) with APDC and DTPA were characterized by IR spectroscopy.

chromium(III)/(VI) ; manganese(II)/(VII) ; EDXRF

nije evidentirano