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Merck
CN

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:
13021-40-4
Molecular Weight:
246.26
NACRES:
NA.22
PubChem Substance ID:
24864445
UNSPSC Code:
12352100
EC Number:
235-881-2
MDL number:
MFCD00001649
Assay:
85%
Form:
powder

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Product Name

Potassium rhodizonate, technical grade, 85%

InChI key

NEWIILAQDSMNML-UHFFFAOYSA-L

InChI

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

SMILES string

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

grade

technical grade

assay

85%

form

powder

mp

>300 °C (lit.)

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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.

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.

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
STBJ1585
STBG7843
STBF0918V
STBD8571V
MKBC7137

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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
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)
Radiochemical determination of radium in urine.
Weiss HV and Lai MG.
Analytical Chemistry, 33(1), 39-41 (1961)
Refined techniques for staining plagioclase and alkali feldspars in thin section.
Houghton HF
Journal of Sedimentary Research, 50(2), 629-631 (1980)
Analysis of sulfate in complex carbohydrates.
L J Silvestri et al.
Analytical biochemistry, 123(2), 303-309 (1982-07-01)
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