Sorption of Se (IV) and (VI) oxyanions from aqueous solutions

Different types of sorbents were tested to selectively remove oxyanions of SeIV and SeVI from model solutions containing various accompanying anions (chlorides, nitrates, sulphates) that simulate real conditions and may affect the sorption of selenium oxyanions. In addition to the optimization of sorption conditions. The best results of selenite sorption were achieved with sorbent GEH (hydrated iron oxide sorbent) and selenate sorption with Purolite S110 (N-methylglucamine functional group). The optimal pH for sorption of SeIV using GEH was found to be 3 and for sorption of SeVI it was pH 4.

Archaeometric analysis of architectural ceramics form the site “Khustiin bulag” Tuv province, Mongolia

A series of architectural ceramics, including roof tiles and bricks from the excavation site at Khustyn Bulag, Mungunmorit soum, Tuv aimag (province) of Mongolia were subjected to detailed archaeometric analysis. We present here results of Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM-EDS) and Thermogravimetric analysis (TGA) and their potential to determine the composition of brick samples from one excavation site, and their firing temperatures. In addition, yellow ochre, which is a natural earth rock pigment that contains hydrated iron oxide and represents the most common pigment of antiquity, was revealed at this excavation site. The mineral composition of ochres will be determined and the possible use of it will be discussed.