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Merck

221325

Sigma-Aldrich

Potassium sulfate

ACS reagent, ≥99.0%, powder or crystals

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About This Item

Linear Formula:
K2SO4
CAS Number:
Molecular Weight:
174.26
EC Number:
MDL number:
UNSPSC Code:
12352302
PubChem Substance ID:
NACRES:
NB.24

Pricing and availability is not currently available.

grade

ACS reagent

Quality Level

Assay

≥99.0%

form

powder or crystals

impurities

≤0.01% insolubles
≤5 ppm N compounds

pH

5.5-5.8 (25 °C, 5%)

anion traces

chloride (Cl-): ≤0.001%

cation traces

Ca: ≤0.01%
Fe: ≤5 ppm
Mg: ≤0.005%
Na: ≤0.02%
heavy metals: ≤5 ppm (by ICP)

SMILES string

[K+].[K+].[O-]S([O-])(=O)=O

InChI

1S/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2

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1 of 4

This Item
12658P94581.05151
assay

≥99.0%

assay

99-101%

assay

≥99.0%

assay

-

grade

ACS reagent

grade

-

grade

-

grade

-

impurities

≤0.01% insolubles, ≤5 ppm N compounds

impurities

acidity or alkalinity, in accordance, residual solvents, complies, ≤0.001% heavy metals (as Pb)

impurities

≤0.005% Phosphorus (P), ≤0.1% Insoluble matter

impurities

-

cation traces

Ca: ≤0.01%, Mg: ≤0.005%, heavy metals: ≤5 ppm (by ICP), Fe: ≤5 ppm, Na: ≤0.02%

cation traces

As: ≤2 mg/kg, Ca: ≤50 mg/kg, Fe: ≤10 mg/kg, Mg: ≤20 mg/kg, Na: ≤100 mg/kg

cation traces

Al: ≤0.0005%, Ca: ≤0.01%, Cu: ≤0.0005%, Fe: ≤0.0005%, Mg: ≤0.0005%, NH4+: ≤0.05%, Na: ≤0.01%, Pb: ≤0.001%, Zn: ≤0.0005%

cation traces

-

anion traces

chloride (Cl-): ≤0.001%

anion traces

chloride (Cl-): ≤20 mg/kg

anion traces

chloride (Cl-): ≤0.001%

anion traces

-

General description

Potassium sulfate is a water-soluble inorganic salt that is commonly used in fertilizers. It can be prepared by reacting phosphogypsum and potassium chloride.[1] K2SO4 can form needle-like mullite particles on heating with aluminum sulfate and silicon dioxide.[2] Its application to the soil has shown to minimize bronzing of rice plants.[3]

Application

Potassium sulfate may be used as a sulfonating agent in the preparation of 4′-dibenzo-18-crown-6-sulfonic acid via sulfonation of dibenzo-18-crown-6.[4]

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

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Sulfonation of benzocrown ethers by potassium sulfate in polyphosphoric acid.
Grebenyuk AD, et al.
Chemistry of Heterocyclic Compounds, 37(7), 822-826 (2001)
Rice bronzing in Nigeria caused by nutrient imbalances and its control by potassium sulfate application.
Yamauchi M.
Plant and Soil, 117(2), 275-286 (1989)
Conversion of phosphogypsum to potassium sulfate.
Aagli A, et al.
Journal of Thermal Analysis and Calorimetry, 82(2), 395-399 (2005)
Eagleson M.
Concise Encyclopedia Chemistry, 890-890 (1994)
Minimizing adsorption of proteins on fused silica in capillary zone electrophoresis by the addition of alkali metal salts to the buffers.
Green JS and Jorgenson JW.
Journal of Chromatography A, 478, 63-70 (1989)

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