柠檬酸
有一水柠檬酸与无水柠檬酸两种规格，主要用于食品、饮料行业作为酸味剂、调味剂及防腐剂、保鲜剂。还在化工行业、化妆行业及洗涤行业中用作抗氧化剂、增塑剂、洗涤剂等。
项目 | 单位 | BP 2009 | USP 32 | FCC 6 | E 330 | GB1987-2007 |
性状 | | 白色晶体粉末、无色晶体或颗粒 |
鉴别试验 | | 符合试验 |
溶液色泽&澄清度 | | 符合试验 | 符合试验 | / | 符合试验 | / |
含量 | % | 99.5-100.5 | 99.5-100.5 |
水分 | % | 7.5-9.0 | 7.5-9.0 | ≤8.8 | 7.5-8.8 | 7.5-9.0 |
透光率 | % | / | / | / | / | ≥95 |
钙盐 | ppm | / | / | / | ≤75 | ≤200 |
铁盐 | ppm | / | / | / | ≤5 | ≤5 |
砷 | ppm | / | / | / | ≤1 | ≤1 |
汞 | ppm | / | / | / | ≤1 | / |
重金属 | ppm | ≤10 | ≤10 | / | ≤5 | / |
草酸盐 | ppm | ≤360 | ≤360 | 符合试验 | ≤100 | ≤100 |
氯化物 | ppm | / | / | / | / | ≤50 |
硫酸盐 | ppm | ≤150 | ≤150 | / | ≤150 | ≤150 |
易碳化合物 | | 不深于标准 | 不深于标准 | 符合试验 | 符合试验 | ≤1.0 |
硫酸灰分 | % | ≤0.1 | ≤0.1 | ≤0.05 | ≤0.05 | ≤0.05 |
有机挥发杂质 | | / | / | 符合试验 |
三月桂胺 | mg/kg | / | / | ≤0.1 | | |
铅 | ppm | / | / | ≤0.5 | ≤0.5 | ≤0.5 |
铝 | ppm | ≤0.2 | ≤0.2 | / | / | / |
细菌内毒素 | IU/mg | <0.5 | 符合试验 | / | / | / |
水不溶物 | | / | / | / | / | 过滤时间不超过1min， 滤膜基本不变色， 目视可见杂色颗粒 不超过3个 |
Citric acid
With citric acid and anhydrous citric acid monohydrate two specifications, mainly used in food and beverage industry as sour agent, flavouring agent, preservative and antistaling agent. Also in the chemical industry, cosmetic industry and used as antioxidant, plasticizer and detergent in the washing industry, etc.
Citric acid monohydrate quality standards
project
unit
BP 2009
USP 32
The FCC 6
E 330
GB1987-2007
character
White crystal powder, colorless crystal or granule
Identification test
Conform to the test
Color & clarify degree of solution
Conform to the test
Conform to the test
/
Conform to the test
/
content
%
99.5 to 100.5
99.5 to 100.5
moisture
%
7.5 to 9.0
7.5 to 9.0
8.8 or less
7.5 to 8.8
7.5 to 9.0
Light transmittance
%
/
/
/
/
95 or more
Calcium salt
Parts per million (PPM)
/
/
/
75 or less
200 or less
Iron salts
Parts per million (PPM)
/
5 or less
5 or less
arsenic
Parts per million (PPM)
/
/
/
1 or less
1 or less
mercury
Parts per million (PPM)
/
/
/
1 or less
/
The heavy metal
Parts per million (PPM)
10 or less
10 or less
/
5 or less
/
Oxalic acid salt
Parts per million (PPM)
360 or less
360 or less
Conform to the test
100 or less
100 or less
chloride
Parts per million (PPM)
/
50 or less
sulfate
Parts per million (PPM)
150 or less
150 or less
/
150 or less
150 or less
Easy carbon compounds
Not deeper than the standard
Not deeper than the standard
Conform to the test
Conform to the test
1.0 or less
Sulphated ash
%
0.1 or less
0.1 or less
0.05 or less
0.05 or less
0.05 or less
Organic volatile impurities
/Conform to the test
Three laurylamine
Mg/kg
/
/0.1 or less
Lead (pb)
Parts per million (PPM)
/
/0.5 or less
0.5 or less
0.5 or less
aluminum
Parts per million (PPM)
0.2 or less
0.2 or less
/
Bacterial endotoxin
IU/mg
< 0.5
Conform to the test
/
Water insolubles
Filtering time is less than 1 min,
Membrane filter basic don't change color,
Visual noise can be seen
No more than three
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