Use of 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide immobilized on silica gel for automated preconcentration and selective determination of antimony(III) by flow-injection electrothermal atomic absorption spectrometry

Abstract

Selective sorption of Sb(III) on a microcolumn packed with 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide immobilized on silica gel (DPTH-gel) has been used for determination of Sb(III). A flow-injection system comprising a microcolumn connected to the tip of the autosampler was used for preconcentration. The sorbed antimony was eluted with nitric acid directly into the graphite furnace and determined by AAS. The detection limit for antimony under the optimum conditions was 0.3 ng mL(-1). This procedure was used for determination of antimony in natural water, soil, vegetation, and a certified sample of a city waste incineration ash (BCR 176).

Experimental and DFT studies for selective separation of Sb(iii) and Sb(v) from mixtures with Zr(iv)/Co(ii) using thiourea grafted polystyrene adsorbent

“…Hence, taking advantage of this weak acidity of antimony, sulfur in thioether and thiols as so base, is considered as the best choice for the donor atom. The S-containing organics, [15][16][17][18] mainly thiourea, have been reported for antimony complexation [19][20][21][22][23] and also as antimony eluting agent from ion exchange columns. 7,24 In addition, thiourea immobilized as thiol and isothiouronium resins have also been reported for selective removal of heavier transition metals.…”