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Sigma-Aldrich

Potassium rhodizonate

technical grade, 85%

Synonym(s):

3,4,5,6-Tetraoxocyclohexene-1,2-diol dipotassium salt, Rhodizonic acid potassium salt

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About This Item

Linear Formula:
C6O6K2
CAS Number:
13021-40-4
Molecular Weight:
246.26
EC Number:
235-881-2
MDL number:
MFCD00001649
UNSPSC Code:
12352100
PubChem Substance ID:
24864445
NACRES:
NA.22

grade

technical grade

Assay

85%

form

powder

mp

>300 °C (lit.)

SMILES string

[K+].[K+].[O-]C1=C([O-])C(=O)C(=O)C(=O)C1=O

InChI

1S/C6H2O6.2K/c7-1-2(8)4(10)6(12)5(11)3(1)9;;/h7-8H;;/q;2*+1/p-2

InChI key

NEWIILAQDSMNML-UHFFFAOYSA-L

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General description

Potassium rhodizonate (3,4,5,6-Tetraoxocyclohexene-1,2-diol dipotassium salt, Rhodizonic acid potassium salt), a benzoquinone derivative, is the potassium salt of rhodizonic acid. Its crystalline structure has been reported and it exhibits space group Fddd. Rhodizonate dianion undergoes various thermal and photochemical reactions with various oxidizing reagents in aqueous solution.

Application

Potassium rhodizonate is suitable reagent for the preparation of staining solution used in the rhodizonate test for the detection of lead. It is suitable reagent used in the preparation of barium, thallium, ammonium and silver salts rhodizonic acid by metathesis in aqueous solution.
It may be used in the following studies:
  • To cocrystallize plutonium and radium from urine in the plutonium and radium assay of urine.
  • As a dye in the spectrophotometric determination of sulfate ion.
  • To determine the acid dissociation constants of rhodizonic acid by pH potentiometric titration of potassium rhodizonate with standardized HCl.
  • As a staining agent for plagioclase in the petrographic study.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Fatma Gorbel et al.
Comptes rendus biologies, 325(9), 927-940 (2002-12-17)
This study deals with the impact of chronic exposure to lead on male and female fertility in rats. Male and female rats (3 months old) were fed on commercial tablets (SICO, Sfax). For drinking, some rats were given distilled water
W Marty et al.
International journal of legal medicine, 116(1), 1-4 (2002-04-02)
The histological staining technique using rhodizonate is also effective for the determination of the firing distance by examining the distribution and intensity of the staining reaction. The differentiation between absolute close-range shots and long-range shots is generally possible without any
A spectrophotometric determination of sulfate ion and its application in studies of substrate purity and of aryl sulfatase A kinetics.
A Waheed et al.
Analytical biochemistry, 89(2), 550-560 (1978-09-01)
Dipotassium rhodizonate.
Cowan JA and Howard JAK.
Acta Crystallographica Section E, Structure Reports Online, 60(4), 511-513 (2004)
Analysis of sulfate in complex carbohydrates.
L J Silvestri et al.
Analytical biochemistry, 123(2), 303-309 (1982-07-01)
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