392340
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
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:
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
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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)
Refined techniques for staining plagioclase and alkali feldspars in thin section.
Houghton HF
Journal of Sedimentary Research, 50(2), 629-631 (1980)
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
Radiochemical determination of radium in urine.
Weiss HV and Lai MG.
Analytical Chemistry, 33(1), 39-41 (1961)
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