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60152

Sigma-Aldrich

Chromium(III) potassium sulfate dodecahydrate

purum p.a., ≥98.5% (RT)

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Synonym(s):
Chrome alum, Potassium chromium(III) sulfate dodecahydrate
Linear Formula:
CrK(SO4)2 · 12H2O
CAS Number:
Molecular Weight:
499.40
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

purum p.a.

Quality Level

Assay

≥98.5% (RT)

form

crystals

mp

89 °C (lit.)

anion traces

chloride (Cl-): ≤200 mg/kg

cation traces

Ca: ≤500 mg/kg
Cd: ≤50 mg/kg
Co: ≤50 mg/kg
Cu: ≤50 mg/kg
Fe: ≤200 mg/kg
Na: ≤1000 mg/kg
Ni: ≤50 mg/kg
Pb: ≤50 mg/kg
Zn: ≤50 mg/kg

SMILES string

O.O.O.O.O.O.O.O.O.O.O.O.[K+].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O

InChI

1S/Cr.K.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4

InChI key

ZFVHBEKVAITXHW-UHFFFAOYSA-J

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This Item
24336120780231242
Potassium dichromate ACS reagent, ≥99.0%

Sigma-Aldrich

207802

Potassium dichromate

Essential Grade
Aluminum potassium sulfate dodecahydrate puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5%

Sigma-Aldrich

31242

Aluminum potassium sulfate dodecahydrate

Essential Grade
assay

≥98.5% (RT)

assay

≥98%, 98.0-102.0% (ACS specification)

assay

≥99.0%

assay

≥99.5%

form

crystals

form

crystals

form

crystals

form

powder or crystals

mp

89 °C (lit.)

mp

89 °C (lit.)

mp

398 °C (lit.)

mp

92 °C (lit.)

anion traces

chloride (Cl-): ≤200 mg/kg

anion traces

chloride (Cl-): ≤0.002%

anion traces

chloride (Cl-): ≤0.001%, sulfate (SO42-): ≤0.005%

anion traces

chloride (Cl-): ≤5 mg/kg

cation traces

Ca: ≤500 mg/kg, Cd: ≤50 mg/kg, Co: ≤50 mg/kg, Cu: ≤50 mg/kg, Fe: ≤200 mg/kg, Na: ≤1000 mg/kg, Ni: ≤50 mg/kg, Pb: ≤50 mg/kg, Zn: ≤50 mg/kg

cation traces

Al: ≤0.02%, Fe: ≤0.01%, NH4+: ≤0.01%, heavy metals (as Pb): ≤0.01%

cation traces

Ca: ≤0.003%, Na: ≤0.001%, Na: ≤0.02%, heavy metals (as Pb): ≤5 ppm

cation traces

As: ≤2 mg/kg, Cd: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Na: ≤100 mg/kg, Pb: ≤10 mg/kg

General description

Chromium(III) potassium sulfate dodecahydrate (Potassium chromium(III) sulfate dodecahydrate, Chrome alum) is a violet colored solid. It has been synthesized by reacting sulfur dioxide with potassium dichromate (diisolved in sulfuric acid) at -38°C. It is widely used chemical in dyeing and textile industry.

Application

Chromium(III) potassium sulfate dodecahydrate (KCr(SO4)2.12H2O) may be used for coating the slides for microscopic studies on Periplaneta americana. It may be used in the preparation of quasi-monodisperse spherical core-shell particles of Cr/α-Cr2O3.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK

WGK 3


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H Murabayashi et al.
The Journal of veterinary medical science, 61(10), 1183-1186 (1999-11-24)
One of the most attractive characteristics of a horse testis is the change of the weight during development. As the testicular weight changes and the number of Leydig cells decreases, pigments appear in interstitial tissues. In the present study, the
Venous sclerosants: distant ischaemic disorders.
Prescrire international, 20(117), 155-155 (2011-06-18)
T J Filler et al.
Histochemistry, 101(5), 375-378 (1994-06-01)
This paper introduces two innovations in reflection contrast microscopy (RCM): (1) an extended application for qualitative light microscopic investigations; and (2) a novel method for quantification in cytochemistry. (1) We found out that RCM cannot only be used for surface
P van Duijn et al.
Histochemistry, 82(4), 363-376 (1985-01-01)
A new hypothesis is proposed on the involvement of nucleosomes in Giemsa banding of chromosomes. Giemsa staining as well as the concomitant swelling can be explained as an insertion of the triple charged hydrophobic dye complex between the negatively-charged super-coiled
E K Schulte et al.
The Histochemical journal, 23(5), 241-245 (1991-05-01)
In the present study, the staining characteristics of the Gallocyanin chromalum technique devised by Husain and Watts are compared with the Feulgen reaction. Liver imprints, blood smears, and cervical smears were fixed in ethanol and stained with either the Husain

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