CITRIC ACID 99.5% A.C.S. REAGENT (C005B-080387)

General description

Citric acid is an organic acid commonly used as a chelating agent, a buffering agent, for pH adjustment and derivatization.

Application

Citric acid has been used to prepare:

• Phosphate citrate buffer for use in enzyme-linked immunosorbent assay.
• Citrate-stabilized ceria aqueous sol, which was employed in the synthesis of cerium oxide nanoparticles.
• Citric acid-Na₂HPO₄-buffered stock solution for use in the determination of fecal urease activity.
• Anticoagulant citrate dextrose solution A (ACD-A), which is employed during the isolation of blood-derived endothelial progenitor cells.

Citric acid has also been used:

• In a novel process which allows controlling of the particle size during the synthesis of palladium cuboctahedrons.
• To prepare citric acid-derived carbon nanodots (CNDs) by bottom-up carbonization method.
• As a bi-component chelating agent for the synthesis of Li4Ti₅O₁₂ (lithium titanate oxide) by a novel sol–gel method.

Other Notes

Go to Redi-Dri^™ Product Listing 791725

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Molecular Weight: 192.12. Empirical Formula: C₆H₈O₇. linearFormula: HOC(COOH)(CH₂COOH)₂. grade: ACS reagent. Quality Level: 200. Assay: ≥. 99.5%. form: crystals. expl. lim.: 8 . %, 65 . °F. impurities: Substances carbonizable by hot sulfuric acid, passes test. ign. residue: ≤. 0.02%. pKa : (1) 3.13, (2) 4.76, (3) 6.4. mp: 153-159 . °C (lit.). anion traces: chloride (Cl^-): ≤. 0.001%, oxalate (C₂O₄^2-): passes test (limit about 0.003%), phosphate (PO₄^3-): ≤. 0.001%, sulfate (SO₄^2-): ≤. 0.002%. cation traces: Fe: ≤. 3 . ppm, Pb: ≤. 2 . ppm. SMILES string: OC(: O)CC(O)(CC(O): O)C(O): O. InChI: 1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12). InChI key: KRKNYBCHXYNGOX-UHFFFAOYSA-N. Gene Information: human ... SRC(6714). Pictograms: GHS07. Signal Word: Warning. Hazard Statements: H319 - H335. Precautionary Statements: P261 - P264 - P271 - P280 - P304 + P340 + P312 - P305 + P351 + P338. Hazard Classifications: Eye Irrit. 2 - STOT SE 3. Target Organs: Respiratory system. Storage Class Code: 11 - Combustible Solids. WGK: WGK 1. Flash Point(F): Not applicable. Flash Point(C): Not applicable. Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves.