1.06528

Supelco

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:
Molecular Weight:
190.11
MDL number:
EC Index Number:
231-673-0

storage conditions

Store at +5°C to +30°C.

Quality Level

grade

ACS reagent

Agency/Method

reag. Ph. Eur.

assay

98.0-100.5% (iodometric)

form

powder

potency

1540 mg/kg LD50, oral (Rat)
>2000 mg/kg LD50, skin (Rat)

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 (S2O32-): ≤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

Related Categories

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 %

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