SX0785

Sodium sulfite

anhydrous, Meets ACS Specifications, Meets Reagent Specifications for testing USP/NF monographs GR ACS

• Linear Formula: Na₂SO₃
• CAS Number: 7757-83-7
• Molecular Weight: 126.04
• MDL number: MFCD00003503
• UNSPSC Code: 12352302
• EC Index Number: 231-821-4

Properties

• Quality Level: 200
• assay: ≥98.0% (iodometric)
• form: powder
• impurities: ≤0.005% Insoluble matter; ≤0.03 meq/g Titrable free base
• pH: 8.8-10 (20 °C, 50 g/L in H₂O)
• mp: >500 °C (decomposition)
• solubility: 220 g/L
• anion traces: chloride (Cl^-): ≤0.02%
• cation traces: Fe: ≤0.001%; heavy metals (as Pb): ≤0.001%
• shipped in: ambient
• storage temp.: room temp
• SMILES string: [Na+].[Na+].[O-]S([O-])=O
• InChI: 1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
• InChI key: GEHJYWRUCIMESM-UHFFFAOYSA-L

Description

Application

• Comparative Studies of Organic Contaminant Removal in Different Calcium Sulfite-Enhanced Oxidant/Fe(II) Systems: This research explores the effectiveness of sodium sulfite in enhancing the removal of organic contaminants through various oxidant systems. (Zhou et al., 2023).


• Review of Traditional and Emerging Residual Chlorine Quenchers on Disinfection By-Products: Focuses on the role of sodium sulfite as a residual chlorine quencher in water treatment processes, analyzing its impact on reducing harmful by-products and enhancing water quality (Li et al., 2023).


• Boosting the Photoelectrochemical Performance of Bismuth Vanadate Photoanode Through Homojunction Construction: Investigates how sodium sulfite can improve the photoelectrochemical properties of bismuth vanadate, significant for renewable energy applications, particularly in solar energy conversion (Wang et al., 2023).


• Light-driven Oxidative Demethylation Reaction Catalyzed by a Rieske-type Non-heme Iron Enzyme Stc2: Demonstrates the use of sodium sulfite in enzymatic reactions to achieve oxidative demethylation, which is crucial for synthetic biology and enzyme engineering (Hu et al., 2022).


• Preparation of Nano Disperse Dyes Using Sulfomethylated Lignin: Effects of Sulfonic Group Contents: Highlights the application of sodium sulfite in the preparation of environmentally friendly nano disperse dyes from lignin, emphasizing its potential in sustainable material science (Tang et al., 2023).

Analysis Note

Assay (iodometric): 98.0% min
Chloride (Cl): 0.02% max
Free acid: To pass test
Heavy metals (as Pb): 0.001% max
Insoluble matter: 0.005% max
Iron (Fe): 0.001% max
Titrable free base: 0.03meq/g max

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable