Post-digestion UV irradiation proved very efficient since not only complete organoselenium decomposition was achieved but also the final step required for prereduction of Se(VI) into Se(IV) (i.e. heating at 90 °C for 30 min in 6 M HCl) could be avoided.

http://www.sciencedirect.com/science/article/pii/S0003267007006976

Sometimes it is not  easy to get better recovery so we can use microwave digestor to digest the fish sample.