FCCV标准-Sodium Methylate 甲醇钠.pdf

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Monographs/ Sodium Methylate/425
Lead Not more than 5 mgk
Procedure Set a suitable atomic absorption spectropho-
Loss on Ignition Anhydrous: Not more than 0.5%; Penta- tometer to a wavelength of 217 nm. Adjust the instrument to
hydrate: Between 40.5% and 42.7%.
Standard Lead Solution containing 0.50 ugmL of lead
TESTS
(Pb) ion.
Aspirate the Sample Solution into the spectrophotometer,
Assay for Silicon Dioxide and Sodium Oxide
and measure the absorbance in the same manner. The ab-
Silicon Dioxide In a beaker, acidify g of sample, accu- sorbance obtained from the Sample Solution is not greater
rately weighed, with 5 mL of hydrochloric acid, and evaporate than that obtained from the Standard Lead Solution.
to dryness on a steam bath. Repeat the treatment with an Loss on Ignition Ignite a sample, accurately weighed, in a
additional5 mL of hydrochloric acid, and mix the residue suitable tared crucible at000for20min.
ion of hydrochloric acid. Digest the
steam bath to dissolve the soluble salts, filter Packaging and Storage Store in tight containers.
ess filter paper, and
er. Wash the paper
nsler the paper to
arelully char
away the Sodium Methylate
ts contents to con-
weigh. Moisten Sodium Methoxide
ter, add 15 mL of
cid cautiously. CH3ONa
Formula wt 54.02
ime hood until all of
cAS:[124-41-4
residue to constant
rucible in a
alent to the
DESCRIPTION
ole, accurately Sodium Methylate occurs as a white, amorphous, hygroscopic,
issolu
free-lowing powder. It is soluble in fats, in esters, and in
of 0.1 alcohols. It decomposes without melting above 127.
roxide unt
volume
Caution: Sodium Methylate and its solutions are caustic
and flammable. Avoid contact with the eyes, skin, and
clothing, and do not inhale vapors from Sodium Methyl-
ate solutions.
of ACS Function Catalyst for the transesterification of fats.
mL of water
)mL with REQUIREMENTS
ution in glass Identification A sample reacts with oxygen and carbon di
oxide and is decomposed by water. The resulting solution
gives positive tests for Sodium, Appendix IIIA
of Lead Assay Not less than 97.0% of CH3ONa
Arsenic Not more than 3 mg/kg
Lead Not more than 5 mg/kg.
Mercury Not more than mg/kg.
Sodium Carbonate Not more than 0.4%.
Sodium Hydroxide Not more than 1.7%.
TESTS
as possible of th
ote: The tests in the following section must be con-
urry and beaker w
ducted with a minimum exposure of the sample to air.
decanting each washing
the las
Preferably conduct the tests in a nitrogen hood
nally, wash the filier paper with 15 mL of hot water, cool the
filtrate to room temperature, dilute to volume with water,
Assay, Sodium Carbonate, and Sodium Hydroxide
and mix
Sample Preparation Select two tared weighing bottles,
each approximately 30 mm x 80 mm, fill each almost to
426/Sodium Nitrate/ Monographs
FCCV
volume with 12 to 15 g of sample, securely fit the covers, Sodium Nitrate
and weigh
Determination of Alkalinity as CH3ONa Remove the top NaNO3
les, and immediately pla
Formula wt 85.00
ce the
Erlenmeyer flask containing 200 mL of INS: 251<