FCCV标准-Sodium Ferrocyanide亚铁氰化钠.pdf

414/ Sodium Ferrocyanide/ Monographs
FCCV
separate 250-mL volumetric flasks, dilute to volume with (SnCl2 2H20) in 40 mL of warm hydrochloric acid and dilut
ing wi
and i
and add 1.0 mL of:5 washing bottle to the aeration apparatul
n the
on the
otassium perman- magnetic stirrer, turn stopcock
the bypass to the aerat-
ganate solution to each. Heat the solutions just to boiling, ing position, and obtain the absorbance reading. Disconnect
bottle c from the aeration apparatus, discard the solution just
tested, wash bottle c and
water, and
cover with a watch repeat the procedure with the remaining solutions. Correct
glass, and allow to stand at room temperature for about 5 the sample readings for the reagent
mk, and determine
reparalion from a
and cool. Transfer the solution into a 250-mL volumetric standard curve prepared by plotting the readings obtained with
e Standa
cury concentration
1
Note: Disregard any undissolved material that may be
milligrams per kilogram, suitable adjustments being made for
dilution factors.
Transfer a 50.0-mL aliquot of this solution into a 150-mL Packaging and Storage Store in well-closed containers.
beaker, and add 1.0 m
sulfuric acid and 1.0 mL of a
filtered1:25 potassium permanganate solution. Heat the solu-
about 5 min, and cool. Prepare
ry Detection Instrument as de- Sodium Ferrocyanide
as shown in Fig. 16 under
, th or the purposes of the Yellow Prussiate of Soda
the Techtron AA-1000
pped with a 10-cm
Formula wt 484.07
0. 75144, or equivalent) INS: 535
eries A-25,
ca:13601-19-91
n Series
as shown DESCRIPTION
x IIIB. Use
absorption cell Sodium Ferrocyanide occurs as yellow crystals or as a crystal-
nd place line powder. It is soluble in water, but it is practically insoluble
he assembly to in most organic solvents.
e so Function Anticaking agent for sodium chloride.
aming in REQUIREMENTS
Identification Add 1 mL of ferric chloride TS to 10 mL of
the a 1% solution of the sample. A dark blue precipitate forms.
Assay Not less than 99.0% of NarFe(CN).
Chloride Not more than (.2%.
Cyanide Passes test.
Ferricyanide Passes test.
Free Moisture Not more than 1%.
Insoluble Matter Not more than 0.03%.
Sulfate Not more than 0.07%.
.
determinat
Treat the b
TESTS
the Sample
ution to Assay Transfer about 3 of sample, accurately weighed,
be tested into a 125-mL g
le (c), using a few into a 400-mL beaker dissolve it in 225 mL of water, and
drops of 1: 10 hydroxylamine h
solution to re- cautiously add about 25 mL of 95% sulfuric acid. Add, with
move any manganese hydroxide from the beaker. Dilute to stirring, 1 drop of orthophenanthroline TS, and titrate with
about 55 mL with water, and add a magnetic stirring bar. 0.1 N ceric sulfate until the color changes sharply from orange
Discharge the permanganate color by adding, dropwise, the to pure yellow. Each milliliter of 0. 1 N ceric sulfate is equiva-
1: 10 hydroxylamine hydrochloride solution swirling after lent to 96.81 mg of NaqFe(CN)6-10H2O