FCCV标准-Sodium Alginate海藻酸钠.pdf

FCCV
Monographs Sodium Aluminosilicate /401
Fluoride Determine as directed in Method IV under Fluo- in the assay is equivalent to 27.75 mg of Sodium Alginate
ride Limit Test, Appendix IB, using a 2-g sample.
(equiv wt 222.00), calculated on the dried basis
Insoluble Substances Dissolve 10 g of sample in 100 mL Arsenic Determine as directed under Arsenic Limit Test,
of hot water, and filter the solution through a tared filtering Appendix IIIB, using a Sample Solution prepared as directed
com
crucible. Wash the insoluble residue with hot water, dry at for organic compounds
105for 2 h, cool, and weigh
Lead Determine as directed under Lead Limit Test, Appen-
Lead Determine as directed in the APDC Extraction Method dix IIIB, using a Sample Solution prepared as directed for
under Lead Limit Test, Appendix IIIB.
organic compounds, and 5 ug of lead(Pb) ion in the control.
Packaging and Storage Store in tight containers.
Loss on Drying Determine as directed under Loss on Dry-
ing, Appendix IIC, drying a sample at 105 for 4 h.
Packaging and Storage Store in well-closed containers
Sodium Alginate
Algin
(C6H,O6Na)n
Equiv wt, calculated 198.11 Sodium Aluminosilicate
Equiv wt, actual (avg.)222.00
Sodium Silicoaluminate
INS: 401
cAS:[9005-38-31
INS:554
ca:1344-00-91
DESCRIPTION
DESCRIPTION
Sodium Alginate occurs as a white to yellow-brown, fibrous
or granular powder. It is the sodium salt of alginic acid (see Sodium Aluminosilicate occurs as a fine, white, amorphous
the monograph for Alginic Acid). It dissolves in water to form powder, or as beads. It is a series ofhydrated sodium aluminum
a viscous, colloidal solution. It is insoluble in alcohol and in silicates having Na2O: Al2O3: SiO2 molar ratios of approxi-
hydroalcoholic solutions in which the alcohol content is mately 1: 1: 13, respectively. It is insoluble in water and in
greater than about30 % by weight. It is insoluble in chloro-alcohol- and other organic solvents, but at80°to100°,it
form, in ether, and in acids having a ph lower than about 3. is partially soluble in strong acids and solutions of alkali
Function Stabilizer; thickener; emulsifier; gelling agent.
hydroxides.
Function Anticaking agent.
REQUIREMENTS
Identification
REQUIREMENTS
A. Add 1 mL of calcium chloride TS to mL of a 1:100
aqueous soluti
ous, gelatinous precipitate forms. Identification
B. Add mL of 2 N sulfuri
acid to 10 mL of 1: 100
A. Mix 500 mg of sample with 2.5 of anhydrous potassium
aqueous solution. A heavy, gelatinous precipitate forms.
carbonate, and heat the mixture in a platinum or nickel crucible
into a test tube, add 5 mL
until it melts completely. Cool, add mL of water, and allow
of water, mL of a
to stand for min. Heat the bottom of the crucible gently,
nol: ethane
naphtholresorci- detach the melt, and transfer it into a beaker with the aid of
and then cool
about 50 mL of water. Gr
bserddually add hydrochloric acid unt
no effervescence is observed, add 10mL more of the acid
to about. Ir
mL separator
eto and evaporate to dryness on a steam bath. Cool, add 20 mL
of water, boil, and filter through ash-free filter paper. An
recti