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The vibrational spectra, Fourier transform Raman, Fourier transform infrared, and surface-enhanced Raman scattering (SERS) spectra of the dyes cresyl fast violet, phloxine B, and saffron have been recorded and analyzed. The intensity of the intense SERS peak of the aromatic ring vibration at 1495 cm -1 in phloxine B, and the intense 592 cm -1 peak due to CCC and CNC in plane...
Adsorptive accumulation in stripping voltammetry has been applied for trace determination of 2-thiocytidine. Accumulation is achieved by controlled adsorption of Hg(II)-2-thiocytidine film on the hanging mercury drop electrode (HMDE). The adsorption of Hg(II)-2-thiocytidine at the HMDE was investigated using out-of-phase ac voltammetry and cyclic voltammetry. Experimental and instrumental parameters...
Four aromatic disulfonic acids, namely, 1,3-benzenedisulfonic, 4-5-dihydroxy-1,3-benzenedisulfonic, 2,5-dihydroxy-1,4-benzenedisulfonic and 4-formyl-1,3-benzenedisulfonic acid have been examined as potential eluents in the indirect UV photometric ion chromatographic determination of ionic species in samples of commercial and environmental interest. Of these new eluents the acid 2,5-dihydroxy-1,4-benzenedisulfonic...
A new crown hydroxamic acid (NHDTAHA) is used for the extraction and spectrophotometric determination of vanadium (V). The molar absorptivity is 2.5 x 10 4 1 mol -1 cm -1 at 395 nm and the system obeys Beer's law over the range 0.05-3.0 ppm of vanadium. For ICP-AES measurements, the extract can be directly aspirated, which enhances the sensitivity 25-fold and the...
Flow injection analysis (FIA) offers some special possibilities for calibration in atomic spectrometry. One of those procedures, the 'interpolative standard addition method' (ISAM), has been critically investigated and compared to conventional calibration procedures both theoretically and experimentally. Using the influence of aluminium on the determination of magnesium by flame atomic absorption...
Stripping analysis employing adsorption preconcentration has been applied for the trace determination of xanthine at the hanging mercury drop electrode (HMDE). The adsorption and redox behavior are indicated by ac and cyclic voltammetry. The strong interaction of xanthine with the mercury electrode leads to the formation of an adsorbed film of Hg(II)-xanthate compound at the electrode surface. ...
The preconcentration of gold in water on tungsten bar followed by electrothermal atomic absorption spectrometry with a molybdenum tube atomizer is described. The optimal immersing time was 15 s. The best pH for gold adsorption was 3. Under optimal conditions, the detection limit was 1.6 pg mL -1 (3S/N). The effects on the preconcentration of gold by large amounts of concomitants were...
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