X-ray fluorescence analysis of trace metal ions following a preconcentration of metal-diethyldithiocarbamate complexes by homogeneous liquid-liquid extraction
A. Takahashi et al., X-ray fluorescence analysis of trace metal ions following a preconcentration of metal-diethyldithiocarbamate complexes by homogeneous liquid-liquid extraction, FRESEN J AN, 368(6), 2000, pp. 607-610
A homogeneous liquid-liquid extraction method for 36 metal ions with diethy
ldithiocarbamate was studied. As a result, 11 metal ions were extracted as
metal-chelates. Under the experimental conditions, the maximum concentratio
n factor was 500 (i.e., 0.1 mL of sedimented liquid phase was produced from
50 mL of aqueous phase). Moreover, the proposed method was utilized as a p
reconcentration method for X-ray fluorescence analysis of these metals. The
recovery of each metal was ca. 97-100%. All calibration curves were linear
over the range of 5.0 x 10(-7) mol L-1 to 1.0 x 10(5) mol L-1. The detecti
on limits were at the 10(-8) mol L-1 levels and the relative standard devia
tions were below 5% (5 determinations). When the proposed method was used f
or the determination of contaminants in a synthetic sample (Al-based alloy
model) and of components in an Au-Pd alloy, the results were satisfactory.