Citric acid is an important organic acid, also known as citric acid, colorless crystals, often containing a molecule of crystal water, odorless, has a strong acid taste, soluble in water. Its calcium salt is more soluble in cold water than in hot water, and this property is often used to identify and separate citric acid. Anhydrous citric acid can be obtained by controlling appropriate temperature during crystallization. It has many uses in industry, food industry, cosmetic industry and so on.
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Item
|
Unit
|
BP 2013
|
USP 36
|
FCC 8
|
E 330
|
GB1987-2007
|
|
Characters
|
|
White Crystalline Powders,Colorless Crystals or Granules
|
|
Identification
|
|
Pass Test
|
|
Color & Clarity of Solution
|
|
Pass Test
|
Pass Test
|
/
|
Pass Test
|
/
|
|
Assay
|
%
|
99.5-100.5
|
|
Water
|
%
|
7.5-9.0
|
7.5-9.0
|
¡Ü8.8
|
7.5-8.8
|
7.5-9.0
|
|
Light Transmittance
|
%
|
/
|
/
|
/
|
/
|
¡Ý95
|
|
Calcium
|
ppm
|
/
|
/
|
/
|
¡Ü75
|
¡Ü200
|
|
Iron
|
ppm
|
/
|
/
|
/
|
¡Ü5
|
¡Ü5
|
|
Arsenic
|
ppm
|
/
|
/
|
/
|
¡Ü1
|
¡Ü1
|
|
Mercury
|
ppm
|
/
|
/
|
/
|
¡Ü1
|
/
|
|
Heavy Metals
|
ppm
|
¡Ü10
|
¡Ü10
|
/
|
¡Ü5
|
/
|
|
Oxalate
|
ppm
|
¡Ü360
|
¡Ü360
|
Pass Test
|
¡Ü100
|
¡Ü100
|
|
Chloride
|
ppm
|
/
|
/
|
/
|
/
|
¡Ü50
|
|
Sulphate
|
ppm
|
¡Ü150
|
¡Ü150
|
/
|
¡Ü150
|
¡Ü150
|
|
Readily Carbonisable Substances
|
|
Not Darker than Standard
|
Not Darker than Standard
|
Pass Test
|
Pass Test
|
¡Ü1.0
|
|
Sulphated Ash
|
%
|
¡Ü0.1
|
¡Ü0.1
|
¡Ü0.05
|
¡Ü0.05
|
¡Ü0.05
|
|
Volatile Organic Impurities
|
|
/
|
/
|
/
|
Pass Test
|
/
|
|
Tridodecylamine
|
mg/kg
|
/
|
/
|
¡Ü0.1
|
/
|
/
|
|
Lead
|
ppm
|
/
|
/
|
¡Ü0.5
|
¡Ü0.5
|
¡Ü0.5
|
|
Aluminum
|
ppm
|
¡Ü0.2
|
¡Ü0.2
|
/
|
/
|
/
|
|
Bacterial Endotoxins
|
IU/mg
|
<0.5
|
Pass Test
|
/
|
/
|
/
|
|
Water Insoluble Substances
|
|
/
|
/
|
/
|
/
|
Filtration time not more than 1 min;
Filter membrane basically doesn't change color;
Visual mottled particles not more than 3.
|
