TRIPOTASSIUM CITRATE-柠檬酸三钾.pdf


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TRIPOTASSIUM CITRATE

Prepared at the 19th JECFA (1975), published in NMRS 55B (1976) and in S.

To 10 ml of a 1 in 10 solution of the sample add 1 ml of mercuric sulfate TS.
Heat the mixture to boiling and add a few drops of potassium permanganate
TS. A white precipitate is formed.
Test for potassium When hydrochloric acid is present, a solution of the sample gives with
platinum chloride TS a yellow crystalline precipitate (which on ignition
leaves a residue of potassium chloride and platinum).PURITY

Loss on drying (Vol. 4) Not more than 6% (180o, 4 h)

Alkalinity A 1 in 20 solution of the sample is alkaline to litmus. After the addition of
ml of N sulfuric acid and 1 drop of phenolphthalein TS to 10 ml of the
solution no pink colour is produced.

Oxalate To 10 ml of a 1 in 10 solution of the sample add 5 drops of dilute acetic acid
TS and 2 ml of calcium chloride TS. No turbidity develops within 1 h.

Lead (Vol. 4) Not more than 2 mg/kg
Determine using an atomic absorptio

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  • 时间2022-03-10