Sodium Selenite Pentahydrate
Edit Preparation method Sodium selenite can be generated by neutralizing selenite with sodium hydroxide:
Mix the accurately measured sodium hydroxide solution without carbonate and the concentrated selenite solution in the amount required for the above chemical reaction. The solution was placed on anhydrous calcium chloride at room temperature for vacuum evaporation. Because this kind of salt easily forms a supersaturated solution, a glass rod can be used to rub the wall of the vessel to promote crystallization when it evaporates to the end. In order to obtain larger crystals, the precipitated crystallites can be added as seed crystals to the saturated solution, and then continue to evaporate. Drain the crystals with a glass sand core funnel, and place them in a desiccant-free desiccant to remove the water attached to the crystal surface, then Na2SeO35H2O can be prepared.
It has been used to prevent and control Keshan disease and has achieved remarkable results. It is also effective in preventing selenium deficiency in livestock. Used as a reagent for testing alkaloids and seed germination, and also used as a preparation for red glass and glaze. my country has used it to prevent and control Keshan disease and has achieved remarkable results, and it is also effective in preventing selenium deficiency in livestock.
Edit risk terms
R23: Toxic by inhalation. Toxic by inhalation.
R28: Very toxic if swallowed. Very toxic if swallowed.
R31: Contact with acids liberates toxic gas. Contact with acids liberates toxic gas.
R43: May cause sensitization by skin contact. May cause sensitization by skin contact.
R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. Toxic to aquatic organisms, may cause long-term adverse effects on the aquatic environment.