Research on establishment of procedure for determination of Cr(III) and Cr(VI) in environmental water by radiochemical neutron activation analysis

Trace Cr³⁺ and Cr⁶⁺ in water have been determined by preconcentration neutron activation analysis. Cr³⁺ was adsorbed on magnesium oxide and Cr⁶⁺ was reduced to Cr³⁺ and implemented as process on. The precipitate was collected on 0.45 mm membrane filters and irradiated in Lazy Susan facility at a neutron flux of 3.5x10¹² n.cm-2.sec-1. The radioactivities of ⁵¹Cr were measured. ⁵¹Cr radioisotopes were used to evaluate the chemical yield and establish optimal conditions. The detection limit of this method is 0.022 µg when irradiation time is 20 hours and counting time is 1 hour. (author)