Potassium selenite

Potassium selenites.—Little is known of the selenites, but a normal selenite, a primary selenite, and a pyroselenite have been described.6... 

Chromic Selenite, Cr Og.SSeOa, is precipitated as a pale green substance, insoluble in water, when potassium selenite is added to a boiling solution of chromic chloride. If the latter contain excess of hydrochloric acid, the sparingly soluble diselenite, CrgOg.eSeOj, is also formed. ... 

Klushina, Selivanova, Lapin, and Novikova [68KLU/SEL] prepared crystalline anhydrous potassium selenite. The compound was reacted with a lead nitrate solution in a calorimeter. The measured enthalpy change of the reaction was used in Appendix A to... 

Selenium electrodes were obtained by electroplating selenium onto various substrates from a 10.45 M solution of potassium selenite. They were measured against a calomel electrode and the substrate did not affect the potentials. The emf of the selenium-calomel cell was measured with test solutions of potassium selenite of concentrations 0.1, 1, 2, 4, 6, 8, and 10.45 M. The solutions also contained 1 M KOH. The dependence of the emf on pH was studied in another series of experiments. 

A., Heat of formation of potassium selenite, Zh. Neorg. Khim., 13, (1968), 2917-2921, in Russian, English translation in... 

MIC/EBE3] Micka, Z., Ebert, M., Ptacek, P., Preparation of potassium selenites, their solubility and bonding eonditions, Collect. Czech. Chem. Commun., 51, (1986), 2741-2750. Cited on pages 423, 424. 

The relative acute toxicities of sodium selenite, potassium selenite, sodium selenate, and potassium selenate in aqueous solution have been examined in mice (Pletnikova 1970). No significant differences among the toxicities of the potassium and sodium salts of selenium were apparent in this study. In another study, rats tolerated a dose of 1.05 mg selenium/kg/day administered in drinking water as potassium selenate for over 8 months with no deaths, but three of five females and one of three males died by the end of 1 year (Rosenfeld and Beath 1954). Decreased survival was reported in rats fed sodium selenate or selenite at 0.5 mg selenium/kg/day in a 2-year cancer study (Harr et al. 1967 Tinsley et al. 1967). No mortality was observed in hamsters fed 0.42 mg selenium/kg/day as sodium selenite in the diet for 82-142 weeks (Birt et al. 1986). 

Kecherches sur I Action du Sodammonium et du Potass-ammonium sur Quelque Mttalloides, Paris (1900) Feher in Handbook of Preparative Inorganic Chemistry vol. 1, G. Hrauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 421 by igniting potassium selenite or selenate in an atm of hydrogen Berzelius, cited in Metier s vol, 10, 767 (1930). 

Crystalline mass, d 2.29. Reddens on exposure to air. Toms brownish-black when heated. Deliquescent. Forms potassium selenite with selenious acid. Forms potassium bfdroselenide with hydrogen selenide. Sol in water insol in ammonia. 

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