Promotional effect of Mn(II)/KFeO applying onto Se(IV) removal.

Promotional effect of Mn(II)/KFeO [Fe(VI)] applying onto Se(IV) removal was determined for the first time, with description of reaction mechanisms. Four different combinations of water treatment agents [KFeO alone, KFeO with Al(III) ions, KFeO with Fe(III) ions, and KFeO with Mn(II) ions] were used for Se removal in spiked deionized water, and KFeO in combination with Mn(II) ions showed great removal efficiency. Over 90% of Se(IV) (200 μg/L) was removed within 2 min by using 1 mg/L of KFeO and 9 mg/L of Mn(II) ions (pH 7.

Occupational exposure to metals and other elements in the tractor production.

Background: Exposure to metals via air sampling in workplace has been extensively studied; however, the magnitude of individual exposure in various occupational groups may vary dramatically. The aim of this cross-sectional study was to ascertain exposure to selected metals from metal fumes in a series of typical workplaces of contemporary tractor production.

Methods: Ninety-eight (median age 41 (interquartile range (IQR) 23) years, all men) workers from Minsk Tractor Plant were categorized into four groups, including assembly shop workers (group 1); thermal shop staff (group 2); steelmakers (group 3) and welders (group 4).