Measurement of Cr(III)/Cr(VI) species by wavelength modulation diode laser flame atomic absorption spectrometry

摘要

High-performance flow atomic spectrometry of Cr(in) and Cr(V!) species by high-performance liquid chromatogiaphy (HPLC) separation, hydraulic high-pressure nebulization (HHPN) for sample introduction and wavelength modulation-laser atomic absorption spectrometry (WM-LAAS) with diode lasers in an analytical flame is reported 3o- detection limits of 0 5 and 1 ng ml~(-1) have been obtained for Cr(VI) in deionized and drinking water, respectively Due to relatively high blank levels, the corresponding detection limits of Cr(III) are higher than for Cr(VI), i e. 1.6 ng ml~(-1) in deionized water and 5 ng ml~(-1) in drinking water.