Complexometric titration elemental analysis

Only slightly less accurate ( 0.3—0.5%) and more versatile in scale are other titration techniques. Plutonium may be oxidized in aqueous solution to Pu02+2 using AgO, and then reduced to Pu4+ by a known excess of Fe+2, which is back-titrated with Ce4+. Pu4+ may be titrated complexometrically with EOT A and a colorimetric indicator such as Arsenazo(I), even in the presence of a large excess of U02+2. Solution spectrophotometry (Figs. 4 and 5) can be utilized if the plutonium oxidation state is known or controlled. The spectrophotometric method is very sensitive if a colored complex such as Arsenazo(III) is used. Analytically useful absorption maxima and molar absorption coefficients ( s) are given in Table 10. Laser photoacoustic spectroscopy has been developed for both elemental analysis and speciation (oxidation state) at concentrations of 10-4 — 10-5 M (118). Chemical extraction can also be used to enhance this technique. 

Complexometric titration methods of analysis of rare earth elements. 

The CHN elemental analysis was performed on a Perkin-Elmer 240 analyzer. The Eu (III) contents were determined by EDTA complexometric titration. 

Applications Basic methods for the determination of halogens in polymers are fusion with sodium carbonate (followed by determination of the sodium halide), oxygen flask combustion and XRF. Crompton [21] has reported fusion with sodium bicarbonate for the determination of traces of chlorine in PE (down to 5 ppm), fusion with sodium bisulfate for the analysis of titanium, iron and aluminium in low-pressure polyolefins (at 1 ppm level), and fusion with sodium peroxide for the complexometric determination using EDTA of traces of bromine in PS (down to 100ppm). Determination of halogens in plastics by ICP-MS can be achieved using a carbonate fusion procedure, but this will result in poor recoveries for a number of elements [88]. A sodium peroxide fusion-titration procedure is capable of determining total sulfur in polymers in amounts down to 500 ppm with an accuracy of 5% [89]. 

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See also in sourсe #XX -- [ ]

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