Novel silica based adsorbent layer-by-layer modified with polyhexamethylene guanidine and Arsenazo reagents for solid-phase extraction of lanthanides from lignites and products of their processingNovel silica based adsorption materials layer-by-layer modified with polyhexamethylene guanidine and Arsenazo I or Arsenazo III have been proposed for solid-phase extraction of rare earth elements (REE). Silica, modified with Arsenazo I, quantitatively extracted REE at pH 5.5 -7.0, and silica, modified with Arsenazo III, at pH 2.0-6.0 with distribution coefficients of 2.9•10 3 -4.6•10 4 cm 3 g -1 . The adsorption capacity for REE was 1.25-2.85 mg g -1 . Silica, layer-bylayer modified with polyhexamethylene guanidine and Arsenazo III, was used for removal of REE from solutions after digestion of lignites and ashes after their burning.
Abstract-The effect of doping on the optical transmittance of germanium single crystals is studied by infrared Fourier spectroscopy. It is established that the introduction of silicon and tellurium additives into germanium doped with antimony provides a means for improving the temperature stability of the optical properties of the crystals.
Preparation and CertificationAlcan non-metallic standards are powdered samples and are sold in quantities varying from 500 mg to 500 g according to their end-use. The standard samples are prepared from a bulk supply of a representative material, are well homogenized and tested for uniformity of composition using XRF or Electric Sensing Zone.Alcan standard samples for composition are certified by using at least two independent, absolute methods of analysis, such as XRF, ICP, AAS or colorimetric, titrimetric and gravimetric techniques. If only one technique is available, two technicians using two separate setups Limited supply, available to Alcan Group Companies only
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