Potassium Sulfate

(redirected from Potassium sulphate)
Also found in: Dictionary, Wikipedia.

potassium sulfate

[pə′tas·ē·əm ′səl‚fāt]
(inorganic chemistry)
K2SO4 Colorless crystals with bitter taste; soluble in water, insoluble in alcohol; melts at 1072°C; used as an analytical reagent, medicine, and fertilizer, and in aluminum and glass manufacture. Also known as salt of Lemery.

Potassium Sulfate


a salt; colorless crystals. Density, 2.66 g/cm3, melting point, 1074°C. Solubility, 11.1 g per 100 g H2O at 20°C (24.1 g at 100°C).

Potassium sulfate is a consituent of natural potassium salts, such as schoenite (K2SO4·MgS04·6H2O), from which it is also extracted. Potassium sulfate is used in the preparation of alum and potash. In agriculture, it serves as a concentrated chlorine-free potassium fertilizer, containing no less than 45–52 percent K2O, no more than 1 percent MgO, and no more than 10 percent moisture; it is applied primarily to the soil under chlorine-sensitive crops (potatoes, tobacco, flax, grapes, citrus fruits). The presence of the sulfate ion in the fertilizer has a favorable effect on the yield of crucifers (cabbage, rutabagas, turnips) and legumes, which require a large amount of sulfur.

Heating potassium sulfate with concentrated sulfuric acid forms the acid salt potassium hydrosulfate (bisulfate): K2SO4 + H2SO4 = 2KHS04. At temperatures above its melting point (210°C), potassium hydrosulfate is converted first to potassium pyrosulfate (2KHS04 = K2S207 + H20) and then to potassium sulfate and sulfuric anhydride (K2S2O7 = K2SO4 + SO3). This reaction is used for converting substances that are nearly insoluble in acids (for example, calcinated A12O3, Fe2O3, Cr03) into soluble sulfates. Potassium hydrosulfate is also used as a flux in metallurgy.

References in periodicals archive ?
The hydroponics systems make use of potassium chloride and potassium sulphate instead of only potassium for farming.
Potassium sulphate is a key reagent required in the roasting process to extract the lithium product.
Ameliorative effect of potassium sulphate on the growth and chemical composition of wheat (Triticum aestivum L.) in salt affected soils.
Shahdaei said that a chain of other production units including the production units of ammonium sulphate and potassium sulphate can also be added to the Orumieh Petrochemical Complex.
A bag of DAP, and three bags of Potassium Sulphate be applied per acre and be mixed in the soil through ploughing.
Scientific officer Mohammad Tariq said that farmers usually apply Potassium Sulphate (SoP), Potassium Chloride and Potassium Nitrate to overcome potassium deficiency in soil.
Borowiski and Mitchalik [7] found that high quantities of K in leaves were obtained by application of potassium nitrate and the low K content by potassium sulphate and the lowest with potassium chloride.
Mineral blends is further sub-segmented into magnesium sulphate, calcium chloride, potassium sulphate, potassium chloride and potassium lactate.
The company aims to increase its production capacity so that potassium sulphate would reach 380,000 tonnes, chloride calcium would reach 190,000 tonnes and dicalcium phosphate would reach 60,000 tonnes annually.
A pilot test performed at the company's HPD Evaporation and Crystallization Research and Development Center near Chicago, Illinois, replicated the full Ochoa potassium sulphate crystallization process demonstrated previously through bench tests.
The partnership will help Tetra andA Tessenderlo strengthen their respective global positions in calcium chloride and potassium sulphate.A
The present investigation aimed to study the efficiency of insecticides, (Cyhalothrin and Chlorpyrifos) either alone or in their combination with fertilizer (Superphosphate, Potassium sulphate and Urea) on Spodoptera larvae.

Full browser ?