Abstract: The content of selenium is determined by hydrogen generation atomic fluorescence spectrometry with Ziyang selenium-enriched green tea in bag foam as raw material,and the leaching rate of selenium in tea is studied.On the basis of single factor,the conditions for improving the selenium leaching rate of bag selenium-enriched green tea are optimized.The results showed that the leaching rate increases with the increase of extraction time,but decreased with the increase of extraction time and ratio of material to liquid,and the leaching rate was obviously affected by the extraction times,extraction temperature,time and ratio of material to liquid.The orthogonal test and its verification test showed that the leaching rate of Ziyang selenium-rich green tea in bag foam could reach 28.64% under the conditions of extraction temperature 95,time was 6 min,ratio of material to liquid(g:mL) was 1:30 and extraction times was once.

Key words: Se-enrichedtea, leaching condition, leaching rate of selenium, orthogonal experiment