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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:
Molecular Weight:
246.26
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.22
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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.[1] Rhodizonate dianion undergoes various thermal and photochemical reactions with various oxidizing reagents in aqueous solution.[2]

Application

Potassium rhodizonate is suitable reagent for the preparation of staining solution used in the rhodizonate test for the detection of lead.[3] It is suitable reagent used in the preparation of barium, thallium, ammonium and silver salts rhodizonic acid by metathesis in aqueous solution.[2]
It may be used in the following studies:
  • To cocrystallize plutonium and radium from urine in the plutonium and radium assay of urine.[4][5]
  • As a dye in the spectrophotometric determination of sulfate ion.[6]
  • To determine the acid dissociation constants of rhodizonic acid by pH potentiometric titration of potassium rhodizonate with standardized HCl.[7]
  • As a staining agent for plagioclase in the petrographic study.[8]

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

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N C de Souza-Pinto et al.
Free radical biology & medicine, 20(5), 657-666 (1996-01-01)
In this work we investigated the toxicity of a polyphenolic p-benzoquinone derivative, the tetrahydroxy-1,4-quinone (THQ) toward V79 Chinese hamster fibroblasts and analyzed the role of H2O2 and Ca2+ in that mechanism. The exposure of exponentially growing cultures to THQ, in
R Zoja et al.
Biotechnic & histochemistry : official publication of the Biological Stain Commission, 81(4-6), 151-156 (2006-11-30)
We report a staining method for cadaveric tissue using sodium rhodizonate as a skin marker for gunshot residues and a counterstain for the surrounding connective tissue. We studied six well preserved subjects who had died of close range gunshot injury.
Harun Tugcu et al.
The American journal of forensic medicine and pathology, 27(4), 296-299 (2006-11-30)
It is important to investigate the clothing, as well as the body, to determine the range of fire of entry wounds in firearm injuries. Clothing can affect the amount of gunshot residues (GSR) reaching the body and their distribution. The
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
Keiko Murakami et al.
Toxicology in vitro : an international journal published in association with BIBRA, 20(6), 910-914 (2006-03-01)
Rhodizonic acid, a six-membered cyclic hydroxyquinone, produced reactive oxygen species as a complex with transition metals. Addition of rhodizonic acid with ferrous ion caused an inactivation of aconitase the most sensitive enzyme to oxidative stress in permeabilized yeast cells. The

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