1.06528

Sodium disulfite

(sodium metabisulfite) for analysis EMSURE^® ACS,Reag. Ph Eur

• Synonym(s): Sodium disulfite, Sodium metabisulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite
• Empirical Formula (Hill Notation): Na₂O₅S₂
• CAS Number: 7681-57-4
• Molecular Weight: 190.11
• MDL number: MFCD00167602
• UNSPSC Code: 12352302
• EC Index Number: 231-673-0
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 300
• Agency: reag. Ph. Eur.
• product line: EMSURE^®
• Assay: 98.0-100.5% (iodometric)
• form: powder
• potency: 1540 mg/kg LD₅₀, oral (Rat); >2000 mg/kg LD₅₀, skin (Rat)
• impurities: ≤0.005% Insoluble matter
• pH: 3.5-5 (20 °C, 50 g/L in H₂O)
• mp: 150 °C (decomposition)
• solubility: 650 g/L
• density: 2.36 g/cm³ at 20 °C
• bulk density: 1000‑1200 kg/m³
• anion traces: chloride (Cl^-): ≤0.005%; thiosulfate (S₂O₃^2-): ≤0.05%passes test
• cation traces: As: ≤0.0001%; Fe: ≤0.0005%; heavy metals (as Pb): ≤0.001%
• storage temp.: 2-30°C
• InChI: 1S/2Na.H2O5S2/c;;1-6(2)5-7(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2
• InChI key: LDTLADDKFLAYJA-UHFFFAOYSA-L

Description

Analysis Note

Assay (iodometric): 98.0 - 100.5 %
Identity: passes test
Appearance of solution: passes test
pH-value (5 %; water): 3.5 - 5.0
Insoluble matter: ≤ 0.005 %
Chloride (Cl): ≤ 0.005 %
Thiosulfate (S₂O₃):
≤ 0.05 %
: passes test
Heavy metals (as Pb): ≤ 0.001 %
As (Arsenic): ≤ 0.0001 %
Fe (Iron): ≤ 0.0005 %

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H302,H318
• Precautionary Statements: P264 - P270 - P280 - P301 + P312 - P305 + P351 + P338 - P501
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1
• Supplementary Hazards: EUH031
• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable