Citric acid

It is mainly used in the food and beverage industry as a sour agent, flavoring agent, preservative and preservative. It is also used as an antioxidant, plasticizer and detergent in the chemical industry, cosmetic industry and washing industry.

Citric acid has obvious retarding effect when used in concrete, and the content of citric acid in concrete is usually 0.01%~0.10%. When the content of concrete is 0.05%, the strength of concrete for 28 days is still improved, and the strength will be weakened if the content continues to increase. The air content of concrete was slightly changed by adding citric acid, and the frost resistance of concrete was also improved.

Technical index

Inspection characteristics

Citric acid monohydrate Anhydrous citric acid
Appearance Colorless or white crystalline particles or powder; Odorless, very sour taste; Slightly weathered in dry air. A crystalline particle or powder. No odor, very sour taste
Molecular formula C6H8O7 .H2O C6H8O7
Assay (%) 99.5-100.5 99.5-100.5%
Water (%) 7.5-9.0 ≤0.5
Readily carbonisable substances (%) ≤1.0 ≤1.0
Sulhated ash (%) ≤0.05 ≤0.05
Chloride (%) ≤0.005 ≤0.005
Sulfate (%) ≤0.015 ≤0.01

Oxalic acid salt (%)

≤0.01 ≤0.01
Calcium salt (%) ≤0.02 ≤0.02
Total arsenic (mg/kg) ≤1.0 ≤1.0
Lead (mg/kg) ≤0.5

≤0.5

Storage

Store in a dry, ventilated, non-polluting environment, avoid direct sunlight, and not easy to stack in the open. It should be used as soon as possible after opening, otherwise it will be prone to biochemical agglomeration.