Technical Notes:

1.Component for the electrolyte solution used for s elenium electrodeposition onto tin oxide electrodes for

photocatalytic applications 1, 5.

2.Used for the preparation of highly stable, water soluble selenium nanoparticles (2].

3.Used in the synthesis of single -crystalline Se nanorods with remarkable photocatalytic properties ^[3].

4.Used in the synthesis of selenium- containing biologically active derivatives 4, 11, 15.

5.Used for the synthesis of selenium nanoparticles used for biomedical application 6-7.

6.Used for the synthesis of metal selenide nanocomposites with photoelectrocatalytic 8, 12-14, 16, optical ^[9] and sodium-ion storage 1 0 properties .

7. Influence of H2SeO3 on fatal and non-fatal toxic doses of various forms of selenium is reviewed in 17. References: 1.J. Electroanal Chem 2010 639 187. 2.Langmuic 2010 26.1 7617 3.Appl. Catal. B. Environmental. 2011.105 211. 4.Int. J Biol Macromol 2012.51 987 5.Solar E nergy 2012.86 1010 6.Bioprocess Biosyst Eng.. 2013 36.1131. 7.Int. J Biol. Macromol 201465. 155. 8.Adv Eunct. Mater. 2015. 25 1814. 9.J.Alloys Compd. 2015 625 26. 10.Chem. Eur. J. 2016 22.4140. 11.Carbohydr. Polym.. 2016 152 70. 12.Electrochim. Acta. 2017 224 593. 13. Int J Hydrogen Energy. 2019 44 19816. 14.J Mol L iquids.2019 279 434. 15.Mater L ett.2019 234 212 16.ACS Appl Energy Mater.2020 3.231 a 17. J Trace Elem. Med Biol 2020 58 126435.