Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.17516/1998-2836-0256
Ключевые слова: arsenic, separation of chemical species, silica gel, adsorption preconcentration
Аннотация: A method for the adsorption separation of inorganic arsenic species (As(III)/As(V)) using sequentially connected preconcentrating columns filled with functionalized silica gels and their determination by inductively coupled plasma optical emission spectrometry was proposed. As(V) was effectively retained at pH 3.5-6.5 by an adsorbeПоказать полностьюnt containing groups of quaternary phosphonium bases on the surface and exhibiting the properties of an anion exchanger. In this pH range. As(III) was not extracted, which made it possible to separate As(V) from As(III). As(III) was retained in a wide pH range of 1-6 by a complexing adsorbent containing mercapto groups on the surface. Adsorbed As(V) was quantitatively eluted from the surface with 1M HNO3, and As(III) - with 5 % unithiol solution in 2M HCl. The use of non-aggressive eluents allows us to reuse adsorbents for preconcentration of As(III) and As(V) at least 5 times. The separation efficiency was confirmed by the analysis of model solutions. A method for the adsorption separation of inorganic arsenic species (As(III)/As(V)) using sequentially connected preconcentrating columns filled with functionalized silica gels and their determination by inductively coupled plasma optical emission spectrometry was proposed. As(V) was effectively retained at pH 3.5-6.5 by an adsorbent containing groups of quaternary phosphonium bases on the surface and exhibiting the properties of an anion exchanger. In this pH range, As(III) was not extracted, which made it possible to separate As(V) from As(III). As(III) was retained in a wide pH range of 1-6 by a complexing adsorbent containing mercapto groups on the surface. Adsorbed As(V) was quantitatively eluted from the surface with 1M HNO3, and As(III) - with 5 % unithiol solution in 2M HCl. The use of «non-aggressive» eluents allows us to reuse adsorbents for preconcentration of As(III) and As(V) at least 5 times. The separation efficiency was confirmed by the analysis of model solutions. © Siberian Federal University. All rights reserved
Журнал: JOURNAL OF SIBERIAN FEDERAL UNIVERSITY-CHEMISTRY
Выпуск журнала: Vol. 14, Is. 4
Номера страниц: 477-488
Место издания: SIBERIAN FEDERAL UNIV
Издатель: 0