FCCV标准-Sodium Nitrite亚硝酸钠.pdf

FCCV
Monographs/ Sodium Phosphate, Dibasic/427
Sodium Nitrite
molecules of water of hydration. The anhydrous form is hygro
scopic. Both forms are freely soluble in water and insoluble
NaNO2
Formula wt 69.00 in alcohol.
INS:250
AS:[7632-00-0]
Function Emulsifier; texturizer; buffer; nutrient.
DESCRIPTION
REQUIREMENTS
Sodium Nitrite occurs as a white to slightly yellow, granular Identification A 1: 20 aqueous solution gives positive tests
powder, or as white or nearly white, opaque, fused masses for Phosphate and for Sodium, Appendix IllA
or sticks. It is hygroscopic in air. Its solutions are alkaline to Assay Not less than 98.0% of Na2HPO4 after drying.
litmus. One gram dissolves in 1.5 mL of water, but it is Arsenic Not more than 3 mg/kg.
sparingly soluble in alcohol.
Fluoride Not more than 0.005%.
lucts: antimi- Insoluble Substances Not more than 0.2%.
Function Color fixative in meat and meat products antiml- Lead Not more than 4 mg/kg
crobial agent; preservative.
Loss on Drying Anhydrous: Not more than 5.0%; Dihy-
REQUIREMENTS
drate: Between 18.0% and 22.0%
Identification An aqueous solution gives positive tests for TESTS
Sodium and for Nitrite, Appendix IlA nore than 100.5% of Assay Transfer about 6.5 g of sample, previously dried at
NaNO2 after drying.
Lead Not more than 4 mg/kg.
add 50.0 mL of 1 N h
drochloric acid and 50 m
of water
Loss on Drying Not more than 0.25%
and stir until the sample is cor
issolved. Place the
electrodes of a suitable pH meter in the solution, and titrate
TESTS
the excess acid with s
xide to the inflection
Assay Dissolve about 3 g of sample, previously dried over
point occurring a
silica gel for 4 h and accurately weighed, in water to make
calculate the volume
ric acid consumed
100 mL. Pipet 10 mL of this solution into a mixlure of 100.0
by the sample. Continue
N sodium hydrox-
mL of 0.1 N potassium permanganate, 50 mL of water, and
ide until the inflec
at about pH 8.8 is
5 mL of sulfuric acid, keeping the tip of the pipet well below
reached, record the b
llate the volume
N
the surface of the liquid. Warm the solution to40° allow itoI sodu
aLion belween
to stand for 5 min, and add 25.0 mL of 0. 1 N oxalic acid.
the two i
) When A is equal
Heat the mixture to abo
me A of N
rate with 0. N potassium
permanganate. Each
N polassium permanga-When A is greate
mg of Na2HPO4
nate is equivalent to
er of the volume 2.
Lead Determine
t to 142.
mg
of
mit lest, Appen-
dix IIIB, using a solution of of sample in 10 mL of water,
Na2HPO
and 4 ug of lead (Pb) ion in the control.
Arsenic Determine as directed under Arsenic Limit Test,
Loss on Drying Determine as directed under Loss on Dry-
Appendix IIIB, using a solution of g of sample in 35 mL
of water.
ing, Appendix IIC, drying a sample over silica gel for h. Fluoride Determine as directed in Method IV under the
Packaging and Storage Store in tight containers
Fluoride Limit Test, Appendix IIB, using a 2-g sample.
Insoluble Sub:
10 g of sample in 100
m
of hot wate
T, and