FCCV标准-Sodium Lauryl Sulfate十二烷基硫酸钠.pdf

FCCV
Monographs/ Sodium Lauryl Sulfate/419
TS, stopper, and mix. Add 2 mL of 2% sodium arsenite Sodium Lauryl Sulfate
solution, stopper, and mix. Add 10 mL of n-butanol to the
clear solutions, stopper, and mix. Finally, add 5 mL of p- Sodium Dodecyl Sulfate
Phenylenediamine-Iyridine Mixed Reagent, mix, and allow
to stand for 15 min. Remove and discard the aqueous phases, INS: 487
cAS:151-21-3
and filter the alcohol phases into 1-cm cells. The absorbance
of the solution from the Sample Solution, determined at 480
nm with a suitable spectrophotometer, is no greater than that DESCRIPTION
from the Cyanide Standard Solution.
Lead Determine as directed in the Flame Atomic Absorption
Sodium Lauryl Sulfate occurs as small, white or light yellow
Spectrophotometric Method under Lead Limit Test, Appendix crystals. It is a mixture of sodium alkylsulfates consisting
IIIB,
using a 5-g sample.
chiefly of Sodium Lauryl Sulfate [CH3(CH2)10CH2OSO Na].
Methanol and Methyl Esters
One gram dissolves in 10 mL of water, forming an opalescent
otassium Permangamassiuand Pho
nosphoric Acid So
solution.
of 15 mL of phosphoric acid and 70 mL of water. Dilute to Function Surface-active agent.
100 mL with waler
Oxalic Acid and Sulfuric Acid Solution Cautiously add REQUIREMENTS
50 mL of sulfuric acid to 50 m
water, mix, cool, add 5
g of oxalic acid, and mix to d
Identification A 1: 10 aqueous solution gives positive tests
Standard Pr
containing 10.0 for Sodium, Appendix IIIA. After acidifying with hydrochloric
mg of methanol ina
with 1: 10 alcohol, ar
Test Preparation Place 40.0 g of sample in a glass-stop-
Assay Not less than 59.0% of total alcohols.
pered, round-bottom flas
Alkalinity (as NaOH) Passes test (about 0.25%).
Combined Sodium Chloride and Sodium Sulfate Not
more than 8.0%.
alco- Lead Not more than mg/kg.
eceiver Unsulfated Alcohols Not more than 4.0%.
TESTS
Assay Transfer about 5 g of sample, accurately weighed,
asks. to an 800-mL Kjeldahl flask, and add 150 mL of water, 50
mL of hydrochloric acid, and a few boiling chips. Attach a
reflux condenser to the flask, heat carefully to avoid excessive
en boil for about 4 h. Cool the flask, and rinse
e condens
ether in the flask.
separator, rinsing the flask
ashings to the separator
ons of ether,
ed beaker on a
min, cool, and
of sample in 100 mL
Prep
1 Nhydrochloric
pH Determine as directed un
eutralization.
Sugars Add 5 drops of sa
ple, accurately
cupric tartrate TS. No red pre
Sulfate Determine as directed in the Sulfate
e the solution
Chloride and Sulfate Lim
ndicator; add
0.1 N silver
produced by a quantity
livalent to
equivalent of 4.0 g of sodium lactate
shown in a control solution containing 200 ug of sulfate
accurately
(SO4)ion.
weighed, to a 400-mL
f water, heat the
mixture, and stir until completely d
Add 100 mL of
Packaging and Storage Store in tight containers
alcohol to the ho
cover, and digest at a temperature
just below the boiling point for 2 h. Filter while hot through