Speciation of Se(IV) in marine sediments using neutron activation analysis after co-precipitation with dibenzyldithiocarbamate (DBDTC) with phenolphthalein

Inorganic selenium speciation in environmental samples using selective electrodeposition coupled with electrothermal atomic absorption spectrometry

“…Because of the disadvantages of conventional extraction techniques, solvent-free sample preparation methods or those employing fewer organic solvents are becoming increasingly important. Combinations of general separation methods with various detection techniques such as X-ray absorption spectrometry [24][25][26], neutron activation analysis (NAA) [27][28][29], inductively coupled plasma optical emission spectrometry (ICP-OES) [10,[30][31][32] and inductively coupled plasmamass spectrometry (ICP-MS) [8,33], have been applied to measure trace selenium and its species in various samples. Although a high sensitivity is reported for these methods, they are very expensive and unavailable in many academic labs.…”

Multivariate optimization of solvent extraction of Cd(ii), Co(ii), Cr(vi), Cu(ii), Ni(ii), Pb(ii) and Zn(ii) as dibenzyldithiocarbamates and detection by AAS

“…As dibenzyldithiocarbamic acid (DBTCA, Fig. 1) has been previously used as a coprecipitation agent 12,13 and chromatographic derivatization reagent 14 for the determination of Cd(II), Co(II), Cr (VI), Cu(II), Ni(II), Pb(II), Zn(II), Hg(II), Sb(III), Se(VI), Tl(I), Mn(II), Fe(III) and As(III), in this work a method for the simultaneous solvent extraction of Cd(II), Co(II), Cr (VI), Cu(II), Ni(II), Pb(II) and Zn(II) as dibenzyldithiocarbamates with subsequent determination by AAS has been developed. Three ways for optimizing the solvent extraction step are discussed: from the individual metal absorbance, from the sum of the individual absorbances and using an overall desirability function.…”

Continuous extraction with acidified subcritical water of arsenic, selenium and mercury from coal prior to on-line derivatisation-atomic fluorescence detection

“…Spectrophotometry, 6,7 X-ray ¯uorescence spectrometry, 8 colorimetry 9 and atomic absorption spectrometry 10 have been applied to the determination of arsenic in coals. Selenium is present in coal as both organic and inorganic compounds and it has been determined by ¯uorimetry, 11,12 activation analysis 13 and atomic absorption spectrometry. 14,15 In the case of mercury, the methods described have been based on colorimetry±¯uorimetry, 16 gas chromatography, 17 neutron activation 18 and atomic absorption spectrometry.…”