Calcium Sulfate

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calcium sulfate

[′kal·se·əm ′səl‚fāt]
(inorganic chemistry)
CaSO4 A white crystalline salt, insoluble in water; used in Keene's cement, in pigments, as a paper filler, and as a drying agent.
Either of two hydrated forms of the salt: the dihydrate, CaSO4·2H2O, and the hemihydrate, CaSO4·½H2O.

Calcium Sulfate

 

CaSO4, a salt, existing in nature as the dihydrate CaSO4-2H2O (gypsum, selenite) and in an anhydrous state (anhydrite). Anhydrous calcium sulfate occurs in the form of colorless crystals with a density of 2.96 g/cm3 and a melting point of 1450°C. It combines very slowly with water, exhibiting a poor solubility of 0.2036 g per 100 g H2O at 20°C and 0.067 g at 100°C. The half-hydrate CaSO4-1/2 H2O is known; when mixed with water, it hardens rapidly, converting into CaSO«2H2O. Calcium sulfate is used in the manufacture of figures and casts, as a construction material, and in medicine.

calcium sulfate

Anhydrite or gypsum dihydrate which has been calcined to the point at which all the water of crystallization has been removed.
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Es lo que estamos haciendo pero con la maquina es mucho mas divertido [Profesora, Caso4, Formacion NoUniversitaria, 57 anos].
The experiment was carried out in greenhouse following completely randomized design (CRD) with three replications and six treatments included: (1) control and (2) seed priming in 10 mM CaSO4 solution (Gyp-10), (3) 30 mM CaSO4 solution (Gyp-30), (4) 20 ppm solution GA3 (GA-20), (5) 60 ppm solution GA3 (GA-60) (6) water for 12 h (HP-12).
Presence and absorbance of Ca by seeds from primer CaSO4 resulted in better seed germination which seems enough to counter the adverse effects of Na+ and other ions in salt-affected soils (Afzal et al.
The Ca2+:Mg2+ ratio in plant leaves at booting stage was the highest with CaSO4 primed treatments.
Three different types of soils were used in this research study: Normal cultivated soil, Nutrient deficient sandy soil and Soil from industrial area dominant in CaSO4.
The recorded biomass was significantly more in normal cultivated soil (A) compared with nutrient deficient sandy soil (B) and CaSO4 dominated soil (C) from the industrial area.
Almost similar behaviour was found for that of soil C that was industrial area CaSO4 dominant soil.